CN107788946B

CN107788946B - Subjective optometry device and subjective optometry program

Info

Publication number: CN107788946B
Application number: CN201710787259.9A
Authority: CN
Inventors: 泷井通浩; 羽根渊昌明; 河合规二
Original assignee: Nidek Co Ltd
Current assignee: Nidek Co Ltd
Priority date: 2016-09-05
Filing date: 2017-09-04
Publication date: 2022-02-11
Anticipated expiration: 2037-09-04
Also published as: KR102397802B1; CN107788946A; KR20180027333A

Abstract

The invention provides a subjective refraction device and a subjective refraction program, which can measure the optical characteristics of an eye to be detected with high precision when the optical characteristics of the eye to be detected are measured subjectively. The subjective refraction device subjectively measures optical characteristics of an eye to be inspected, and includes: a subjective measurement unit having a correction optical system disposed in an optical path of a projection optical system that projects a target light beam to an eye to be inspected and that changes an optical characteristic of the target light beam, and subjectively measuring the optical characteristic of the eye to be inspected, wherein the subjective optometry apparatus includes: an objective measurement unit having a measurement optical system that emits measurement light to the fundus oculi of an eye to be examined and receives reflected light of the measurement light, and objectively measuring optical characteristics of the eye to be examined; and a control unit for objectively measuring the optical characteristics of the eye to be inspected by the objective measurement unit while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit.

Description

Subjective optometry device and subjective optometry program

Technical Field

The present disclosure relates to a subjective refraction device and a subjective refraction program for subjectively measuring optical characteristics of an eye to be examined.

Background

Conventionally, as a subjective refraction device, for example, a device is known in which a correction optical system capable of diopter correction is separately disposed in front of an eye of a subject and an examination target is projected to a fundus of the eye through the correction optical system (see patent document 1). The examiner receives the response of the examinee, adjusts the correction optical system until the examinee can properly see the optotype, obtains a correction value, and measures the refractive power of the eye based on the correction value. As a subjective optometry apparatus, for example, an apparatus is known which forms an image of an examination optotype via a correction optical system in front of an eye of an examinee and measures the refractive power of the eye without arranging the correction optical system in front of the eye (patent document 2).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 5-176893

Patent document 2: U.S. Pat. No. 3874774 publication

Disclosure of Invention

However, in the subjective refraction device, while the optical characteristics of the eye to be inspected are subjectively measured, the optical characteristics of the eye to be inspected may change due to, for example, the function of the adjustment function of the eye to be inspected. When the main observation is performed in such a state where the optical characteristics change, it is difficult to measure the optical characteristics of the eye to be examined with high accuracy.

In view of the above problems, it is an object of the present disclosure to provide a subjective refraction device capable of measuring optical characteristics of an eye to be inspected with high accuracy when the optical characteristics of the eye to be inspected are subjectively measured.

In order to solve the above problem, the present invention is characterized by having the following configuration.

A first aspect of the present invention provides a subjective refraction device for subjectively measuring an optical characteristic of an eye to be examined, the device including: a subjective measurement unit which has a correction optical system disposed in an optical path of a projection optical system that projects an eye to be inspected with an eye target light beam, and which changes an optical characteristic of the eye target light beam, and which subjectively measures the optical characteristic of the eye to be inspected; an objective measurement unit having a measurement optical system that emits measurement light to a fundus of an eye to be examined and receives reflected light of the measurement light, and objectively measuring an optical characteristic of the eye to be examined; and a control unit that objectively measures the optical characteristics of the eye to be inspected by the objective measurement unit while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit.

A second aspect of the present invention is the subjective refraction device of the first aspect, wherein the control unit obtains a first optical characteristic by the objective measurement unit objectively measuring an optical characteristic of the eye to be examined, and obtains a second optical characteristic by the objective measurement unit objectively measuring the optical characteristic of the eye to be examined while the subjective measurement unit subjectively measuring the optical characteristic of the eye to be examined, the subjective refraction device including: an acquisition unit that acquires adjustment information based on the first optical characteristic and the second optical characteristic; and an output unit that outputs the adjustment information.

A third aspect of the present invention is the subjective refraction device of the second aspect, wherein the control unit objectively measures the optical characteristic of the eye to be examined by the objective measurement unit before subjectively measuring the optical characteristic of the eye to be examined by the subjective measurement unit, thereby obtaining the first optical characteristic.

A fourth aspect of the present invention is the subjective refraction device of the second aspect, wherein the acquisition unit acquires the adjustment information by performing difference processing on the first optical characteristic and the second optical characteristic.

A fifth aspect of the present invention is the subjective refraction device of the second aspect, wherein the subjective refraction device includes: a setting unit that sets, based on the adjustment information, a correction amount for correcting a change in the adjustment state of the eye to be inspected that occurs while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit; and a first correction unit that performs correction for canceling out the change in the adjustment state of the eye to be examined, which is caused in the subjective measurement unit, based on the correction amount set by the setting unit.

A sixth aspect of the present invention is the subjective refraction device of the first aspect, wherein the objective measurement unit includes a measurement optical system for a right eye to be examined and a measurement optical system for a left eye to be examined that are provided as a pair on the left and right.

A seventh aspect of the present invention provides a subjective refraction device for subjectively measuring an optical characteristic of an eye to be examined, the device including: a subjective measurement unit which has a correction optical system that is located in an optical path of a projection optical system that projects a visual target light beam to an eye to be inspected and changes an optical characteristic of the visual target light beam, and which subjectively measures the optical characteristic of the eye to be inspected; an objective measurement unit having a measurement optical system that emits measurement light to a fundus of an eye to be examined and receives reflected light of the measurement light, and objectively measuring an optical characteristic of the eye to be examined; a control unit that obtains a first optical characteristic by objectively measuring an optical characteristic of the eye to be inspected by the objective measurement unit, and obtains a second optical characteristic by objectively measuring the optical characteristic of the eye to be inspected by the objective measurement unit at a timing different from a timing at which the first optical characteristic is obtained; an acquisition unit that acquires adjustment information based on the first optical characteristic and the second optical characteristic; and an output unit that outputs the adjustment information.

An eighth aspect of the present invention is the subjective refraction device of the first or seventh aspect, wherein the correction optical system is disposed in an optical path of the measurement optical system, and the subjective refraction device includes a second correction unit that corrects a measurement result obtained by objectively measuring the eye to be inspected by the objective measurement unit, based on correction information of the correction optical system.

A ninth aspect of the present invention provides a subjective refraction program for use in a subjective refraction device for subjectively measuring optical characteristics of an eye to be examined, the subjective optometry apparatus includes a subjective measurement unit having a projection optical system for projecting a target light beam to an eye to be examined and a correction optical system which is located in an optical path of the projection optical system and changes an optical characteristic of the target light beam, and subjectively measuring the optical characteristics of the eye to be inspected, wherein the objective measuring unit has a measuring optical system for emitting measuring light to the fundus oculi of the eye to be inspected and receiving reflected light of the measuring light, and objectively measures the optical characteristics of the eye to be inspected, wherein, the processor of the subjective refraction device executes the subjective refraction program to make the subjective refraction device execute the following control steps: the optical characteristics of the eye to be inspected are objectively measured by the objective measuring unit while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measuring unit.

A tenth aspect of the present invention is the subjective refraction device of the first aspect, wherein the control unit obtains the optical characteristics of the eye to be examined by objectively measuring the optical characteristics of the eye to be examined by the objective measurement unit after the subjective measurement of the optical characteristics of the eye to be examined is started by the subjective measurement unit, and the subjective refraction device includes an initial value setting unit that sets the optical characteristics of the eye to be examined objectively measured by the control unit as an initial value of the correction optical system when the optical characteristics of the eye to be examined are subjectively measured by the subjective measurement unit.

Drawings

Fig. 1 is an external view of a subjective refraction device.

Fig. 2 is a diagram illustrating the structure of the measurement unit.

Fig. 3 is a schematic configuration diagram of the inside of the subjective refraction device viewed from the front.

Fig. 4 is a schematic configuration diagram of the inside of the subjective refraction device viewed from the side direction.

Fig. 5 is a schematic configuration diagram of the inside of the subjective refraction device viewed from the top.

Fig. 6 is a flowchart illustrating a flow of the control operation.

Fig. 7 is a flowchart illustrating a flow of the control operation for setting the initial value.

Description of the reference symbols

1 subjective optometry device

2 case

3 presenting window

4 monitor

5 lower jaw table

6 base station

7 measurement Unit

10 objective type measuring optical system

25 subjective measurement optical system

30 projection optical system

45 first sign projection optical system

46 second mark projection optical system

50 observation optical system

60 correcting optical system

70 control part

72 memory

81 deflection mirror

84 half-transmitting and half-reflecting mirror

85 concave mirror

90 correction optical system

100 photographing optical system.

Detailed Description

Hereinafter, one of typical embodiments will be described with reference to the drawings. Fig. 1 to 7 are diagrams for explaining the subjective refraction device and the subjective refraction program according to the present embodiment. In the following description, a subjective optometry apparatus is taken as an example. In addition, the following items classified by < > can be utilized independently or in association.

The present disclosure is not limited to the device described in the present embodiment. For example, terminal control software (program) that performs the functions of the embodiments described below is supplied to a system or an apparatus via a network or various storage media. The program may be read and executed by a control device (e.g., CPU) of the system or the apparatus.

In the following description, the depth direction of the subjective refraction device (the front-back direction of the subject person at the time of measurement by the subject person) is defined as the Z direction, the horizontal direction on a plane perpendicular to the depth direction (the left-right direction of the subject person at the time of measurement by the subject person) is defined as the X direction, and the vertical direction (the up-down direction of the subject person at the time of measurement by the subject person) is defined as the Y direction. In addition, R, L given by reference numerals below indicates the right eye and the left eye, respectively.

< summary >

For example, the subjective refraction device (for example, the subjective refraction device 1) of the present embodiment includes a subjective measurement unit. The subjective refraction device includes an objective measurement unit, for example. Further, for example, a control means (e.g., control unit 70) is provided.

< subjective measurement Unit >

For example, the subjective measurement unit subjectively measures the optical characteristics of the eye to be inspected. For example, the optical characteristics of the eye to be inspected, which are subjectively measured, include an eye refractive power (for example, spherical power, astigmatic axis angle, etc.), a contrast sensitivity, a binocular vision function (for example, strabismus, stereoscopic vision function, etc.), and the like.

For example, the subjective measurement unit includes a projection optical system (e.g., projection optical system 30). Further, for example, the projection optical system projects the sighting mark light beam to the eye to be inspected. The subjective measurement unit includes, for example, a correction optical system (e.g., the correction optical system 60 and the subjective measurement optical system 25). For example, the correction optical system is disposed in the optical path of the projection optical system, and changes the optical characteristics of the sighting mark light beam. The projection optical system does not need to be provided integrally with the subjective measurement unit, and a device provided with the projection optical system may be separately provided. That is, the subjective measurement unit of the present embodiment may be configured to include at least a correction optical system.

< projection optical System >

For example, the projection optical system has a light source that projects a target light beam. For example, the projection optical system may include at least one optical member or the like for guiding the eye-target light beam projected from the light source for projecting the eye-target light beam to the eye to be inspected.

For example, a configuration may be possible in which a display (e.g., the display 31) is used as a light source for projecting the sighting mark light beam. For example, as the Display, an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), or the like can be used. For example, an examination target such as a Landolt ring (Landolt ring) target is displayed on the display.

For example, as a light source for projecting the sighting mark light beam, a light source and a DMD (Digital Micromirror Device) may be used. Typically, the DMD is highly reflective and bright. Therefore, the light amount of the sighting mark light beam can be maintained compared with the case of using the liquid crystal display using polarization.

For example, the light source for projecting the target light beam may be a visual light source for presenting the target and a target plate. In this case, for example, the chart is a rotatable disk chart having a plurality of optotypes. The plurality of optotypes include optotypes for visual acuity test used for subjective measurement, for example. For example, optotypes for visual acuity test are prepared with optotypes for each visual acuity value (visual acuity values 0.1, 0.3, …, 1.5). For example, the target plate is rotated by a motor or the like, and the targets are switched and arranged on an optical path for guiding the target beam to the eye to be inspected. Of course, as a light source for projecting the sighting mark light beam, a light source other than the above-described structure may be used.

< corrective optical System >

For example, the correction optical system may be configured to change optical characteristics (for example, at least one of spherical power, cylindrical axis, polarization characteristics, aberration amount, and the like) of the sighting mark beam. For example, the optical characteristics of the sighting mark light beam can be changed by controlling the optical element. For example, the optical element may be configured to use at least one of a spherical lens, a cylindrical lens, a crossed cylindrical lens, a rotating prism, a wavefront modulation element, and the like. Of course, for example, an optical element different from the above-described optical element may be used as the optical element.

For example, the correction optical system may be a structure that corrects the spherical power of the eye to be inspected by optically changing the presentation position (presentation distance) of the optotype with respect to the eye to be inspected. In this case, for example, as a configuration for optically changing the presentation position (presentation distance) of the optotype, a configuration in which a light source (for example, a display) is moved in the optical axis direction may be employed. In this case, for example, an optical element (for example, a spherical lens) disposed in the optical path may be moved in the optical axis direction. Of course, the correction optical system may be a combination of a structure for controlling the optical element and a structure for moving the optical element disposed on the optical path in the optical axis direction.

For example, the correction optical system may be an optometry unit (phoropter) configured to switch and arrange optical elements arranged in front of the eye to be examined. For example, the optometric unit may be of the following structure: the optical device includes a lens disk in which a plurality of optical elements are arranged on the same circumference, and a drive unit for rotating the lens disk, and the optical elements are electrically switched by driving the drive unit (e.g., a motor).

For example, the correction optical system may be configured such that an optical element is disposed between an optical member for guiding the sighting target light beam from the projection optical system to the eye to be inspected and the sighting target presenting unit, and the optical characteristic of the sighting target light beam is changed by controlling the optical element. That is, as the correction unit, a configuration of a ghost lens refractometer (ghost correction optical system) may be used. In this case, for example, the sighting mark light beam corrected by the correction optical system is guided to the eye to be inspected via the optical member.

< Objective measurement Unit >

For example, the subjective refraction device of the present embodiment includes an objective measurement unit. For example, the objective measurement unit objectively measures the optical characteristics of the eye to be examined. For example, the optical characteristics of the eye to be examined that are objectively measured include the ocular refractive power (for example, spherical power, astigmatic axis angle, etc.), polarization characteristics, thickness information of the lens, and the like. In the present embodiment, an objective measurement unit for measuring the eye refractive power of an eye to be examined will be described as an example. Further, for example, the objective measurement unit includes a measurement optical system (for example, objective measurement optical system 10) that emits measurement light to the fundus oculi of the eye to be examined and receives the reflected light thereof. For example, the optical characteristics of the eye to be inspected, which are objectively measured, may be at least one of an image pickup result (image pickup) picked up by the objective measurement unit and a parameter obtained by analyzing the image pickup result. That is, the optical characteristics of the eye to be inspected, which are objectively measured, may be characteristics based on the imaging result obtained by the objective measurement unit.

For example, the objective measurement unit may have a right-eye measurement optical system and a left-eye measurement optical system provided as a pair on the left and right. In this case, for example, the left and right measurements of the measurement optical system for the right subject eye and the measurement optical system for the left subject eye can be performed substantially simultaneously. In this case, for example, the right and left measurements of the measurement optical system for the right eye and the measurement optical system for the left eye may be performed at different timings. For example, the different timing may be a timing at which measurement by one of the measurement optical system for the right eye and the measurement optical system for the left eye is completed. Further, for example, the different timing may be a period during which measurement is performed by one of the measurement optical system for the right eye and the measurement optical system for the left eye.

In addition, for example, the objective measurement unit can perform measurement of the left and right eyes to be examined by one measurement optical system. In this case, for example, the measurement of the eye to be inspected may be performed by emitting the measurement light to the fundus of one eye to be inspected, and when the measurement of one eye is completed, the measurement of the other eye to be inspected may be performed by adjusting the measurement light so as to be emitted to the fundus of the other eye to be inspected.

< measuring optical System >

For example, the measurement optical system includes a projection optical system that projects measurement light from a light source toward the fundus oculi of the human eye to be inspected, and an imaging optical system that images reflected light obtained by reflection of the measurement light on the fundus oculi by an imaging device. For example, the measurement optical system may be an optical system that measures the ocular refractive power of the eye to be examined. In this case, for example, the following configuration can be given as an example of the measurement optical system: a point-like measurement mark is projected onto the fundus oculi of an eye to be examined via the pupil center portion of the eye to be examined, fundus reflection light reflected from the fundus oculi is extracted in a ring-like manner via the pupil peripheral portion, and an image of the ring-like fundus reflection image is captured by an imaging element. In this case, for example, the following configuration can be given as an example of the measurement optical system: an annular measurement mark is projected from the pupil periphery to the fundus oculi, and fundus oculi reflection light is extracted from the pupil center to cause an imaging element to image an annular fundus oculi reflection image. In this case, for example, the measurement optical system may be configured to include a sauter-hartmann sensor. In this case, for example, the measurement optical system may be configured to have a phase difference system in which a slit is projected to the eye to be inspected.

< acquisition of Objective measurement result during subjective measurement >

In the present embodiment, for example, the control unit objectively measures the optical characteristics of the eye to be inspected by the objective measurement unit while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit. For example, when the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit, the subjective measurement of the optical characteristics of the eye to be inspected by the subjective measurement unit may be continued. For example, when the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit, the subjective measurement of the optical characteristics of the eye to be inspected by the subjective measurement unit may be temporarily stopped. In this case, the subjective measurement of the optical characteristics of the eye to be inspected by the subjective measurement unit may be restarted at the time when the objective measurement unit completes the objective observation.

For example, in the present embodiment, the configuration is provided in which the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit, and thus, the change in the optical characteristics of the eye to be inspected during the subjective measurement can be captured from the objective measurement result. Thus, the examiner can perform subjective measurement in consideration of the change in optical characteristics of the eye to be examined during the subjective measurement. Therefore, when the examiner subjectively measures the optical characteristics of the eye to be inspected, the optical characteristics of the eye to be inspected can be measured with high accuracy.

For example, in the case where the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit, the control unit may objectively measure the optical characteristics of the eye to be inspected by the objective measurement unit while at least one or more subjective examinations are performed.

For example, the at least one subjective examination includes a case where one subjective examination is performed and a case where a plurality of subjective examinations are performed. In addition, for example, a subjective examination may be an examination that subjectively measures at least one optical characteristic of the eye being examined.

For example, when a subjective examination is performed, the control unit may objectively measure the optical characteristics of the eye to be examined by the objective measurement unit while the subjective examination is performed by the subjective measurement unit.

For example, when a plurality of subjective examinations are performed, the control unit may objectively measure the optical characteristics of the eye to be inspected by the objective measurement unit while one of the plurality of subjective examinations is performed by the subjective measurement unit. For example, when a plurality of subjective examinations are performed, the control unit may objectively measure the optical characteristics of the eye to be inspected by the objective measurement unit while the subjective measurement unit performs the first subjective examination and the second subjective examination. In this case, for example, the first and second subjective inspections may be subjective inspections for measuring the same optical characteristic, or the first and second subjective inspections may be subjective inspections for measuring different optical characteristics.

For example, the subjective refraction device may include: a transmission unit that transmits an objective measurement start trigger signal for starting objective measurement by the objective measurement unit; and a receiving unit that receives the objective measurement start trigger signal. For example, when the transmission unit transmits the objective measurement start trigger signal and the reception unit receives the objective measurement start trigger signal, the control unit objectively measures the optical characteristics of the eye to be inspected by the objective measurement unit while at least one subjective examination is being performed. For example, the start of the objective measurement by the objective measurement unit may be performed manually or may be performed automatically.

For example, in a configuration in which the start of objective measurement is manually performed, a start switch is provided as transmission means for transmitting an objective measurement start trigger signal for starting objective measurement to the subjective refraction device. For example, the examiner selects the start switch to transmit the objective measurement start trigger signal. For example, the control unit may start measurement by the objective measurement unit when the reception unit receives the objective measurement start trigger signal. For example, the objective measurement may be performed at least once as a configuration for objectively measuring the optical characteristics of the eye to be inspected by the objective measurement unit during the period in which at least one subjective examination is performed. That is, for example, as a configuration for objectively measuring the optical characteristics of the eye to be inspected by the objective measurement unit during the period in which at least one or more subjective examinations are performed, one objective measurement may be performed as the minimum number of measurements, or objective measurement may be performed at all times (in real time) as the maximum number of measurements.

For example, the objective measurement may be performed by the examiner selecting the start switch once during at least one subjective examination at the time of performing one guest observation.

For example, when a plurality of times of observation is desired, the examiner may select the start switch a plurality of times during a period in which at least one subjective examination is performed, thereby performing a plurality of times of objective measurement. Further, for example, when a plurality of times of the guest observation are to be performed, a plurality of times of the objective measurement may be performed by the examiner selecting the start switch once during the period of performing at least one subjective examination.

In addition, for example, when the objective measurement start trigger signal is output once to perform a plurality of times of the objective measurement, the examiner can perform the objective measurement a predetermined number of times by selecting the start switch once during the period in which at least one subjective examination is performed. Further, for example, when the objective measurement start trigger signal is output once to perform a plurality of times of the guest observation timing, the examiner can perform the objective measurement at a preset timing by selecting the start switch once during the period in which at least one subjective examination is performed. In addition, for example, when a plurality of times of the guest observation are performed by outputting the objective measurement start trigger signal once, the measurement can be performed all the time by the examiner selecting the start switch once during the period of performing at least one or more subjective examinations, and the objective measurement can be performed in real time.

For example, in the case of a configuration in which the start of objective measurement is automatically performed, after the subjective examination is started, the control unit controls the transmission unit to transmit an objective measurement start trigger signal at a preset timing. For example, the control unit may start measurement by the objective measurement unit when the reception unit receives the objective measurement start trigger signal. In the present embodiment, the control of the transmission means is performed by the control means, but the present invention is not limited thereto. For example, the present invention may be implemented by separately providing a control unit different from the control unit.

For example, the preset timing may be at least one of a time when the subjective measurement is started (for example, a state in which projection of the target light beam is started, a state in which the inspection program is started, a state in which operation of an operation unit of the subjective inspection apparatus is started, a state in which driving of the correction optical system is started, and the like), a time when a preset time elapses (for example, a time when a predetermined time elapses from the start of the subjective measurement), a time when the inspection target is switched, a time between the subjective inspection and the subjective inspection (when a plurality of subjective inspections are performed), a time when the inspection target performs an answer in the subjective inspection (when the inspection target performs an operation based on the answer of the inspection target), and the like. Of course, the objective measurement start trigger signal may be output at a timing other than the above description.

For example, the objective measurement may be performed at least once as a configuration for objectively measuring the optical characteristics of the eye to be inspected by the objective measurement unit during the period in which at least one subjective examination is performed. That is, for example, as a configuration for objectively measuring the optical characteristics of the eye to be inspected by the objective measurement unit during the period in which at least one or more subjective examinations are performed, one objective measurement may be performed as the minimum number of measurements, or objective measurement may be performed at all times (in real time) as the maximum number of measurements.

For example, at the time of performing the guest observation once, an objective measurement start trigger signal may be output at a predetermined timing during the period in which at least one subjective examination is performed, and the measurement by the objective measurement unit may be started.

For example, when a plurality of times of objective measurement are to be performed, an objective measurement start trigger signal may be output at a predetermined timing during at least one subjective examination to perform a plurality of times of objective measurement. In this case, for example, a plurality of objective measurements may be performed by outputting a plurality of objective measurement start trigger signals during at least one subjective examination. In this case, for example, a plurality of objective measurements may be performed by outputting a trigger signal for starting one objective measurement during at least one subjective examination.

In addition, for example, in the case where a plurality of times of objective measurements are performed by outputting an objective measurement start trigger signal once, objective measurements may be performed a predetermined number of times by outputting an objective measurement start trigger signal once during a period in which at least one subjective examination is performed. Further, for example, when the objective measurement start trigger signal is output once to perform a plurality of times of objective measurement, the objective measurement can be performed a plurality of times at a predetermined timing by outputting the objective measurement start trigger signal once during a period in which at least one subjective examination is performed. Further, for example, when the objective measurement start trigger signal is output once and a plurality of times of observation are performed, the measurement can be performed all the time, and the objective measurement can be performed in real time.

< acquisition of Condition information >

For example, in the present embodiment, the control unit objectively measures the optical characteristic of the eye to be inspected by the objective measurement unit to obtain the first optical characteristic, and objectively measures the optical characteristic of the eye to be inspected by the objective measurement unit while subjectively measuring the optical characteristic of the eye to be inspected by the subjective measurement unit to obtain the second optical characteristic.

For example, in the present embodiment, the subjective refraction device may include an acquisition unit. For example, in the present embodiment, the subjective refraction device may include an output unit. For example, the acquisition unit acquires adjustment information based on the first optical characteristic and the second optical characteristic. For example, the output unit outputs the adjustment information. For example, in the present embodiment, the first optical characteristic is obtained by objectively measuring the optical characteristic, and the second optical characteristic is obtained by objectively measuring the optical characteristic of the eye to be inspected while subjectively measuring the optical characteristic. Adjustment information based on the acquired first optical characteristic and second optical characteristic is acquired, and the adjustment information is output. With this configuration, it is possible to easily obtain a change in optical characteristics of the eye to be inspected during subjective measurement based on the adjustment information based on the first optical characteristics and the second optical characteristics of the eye to be inspected. Therefore, the examiner can measure the optical characteristics of the eye to be examined easily and with high accuracy by using the adjustment information when subjectively measuring the optical characteristics of the eye to be examined.

In addition, for example, by using the eye refractive power which is more likely to be affected by a change in the adjustment state of the eye to be inspected as the first optical characteristic and the second optical characteristic when the adjustment information is acquired, it is easier to capture the change in the optical characteristics. Further, when the eye refractive power is used, if at least spherical power is used, it is easier to capture a change in optical characteristics. Of course, when the eye refractive power is used for obtaining the adjustment information, a configuration may be adopted in which at least any one of the spherical power, the astigmatic power, and the astigmatic axis angle is used.

For example, the timing of acquiring the first optical characteristic may be acquired before the optical characteristic of the eye to be inspected is subjectively measured by the subjective measurement unit. In this case, for example, the control unit may obtain the first optical characteristic by objectively measuring the optical characteristic of the eye to be inspected by the objective measurement unit before subjectively measuring the optical characteristic of the eye to be inspected by the subjective measurement unit. For example, in the present embodiment, before the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit, the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit. In this way, since objective measurement is performed before subjective measurement by the subjective measurement unit, the optical characteristics measured by the objective measurement can be obtained in a state in which the change in optical characteristics due to the use of the subjective measurement unit is suppressed. Therefore, it is possible to obtain optical characteristics measured by an objective formula with changes in the optical characteristics suppressed, and to obtain more favorable adjustment information.

For example, the timing of acquiring the first optical characteristic may be acquired after the optical characteristic of the eye to be inspected is subjectively measured by the subjective measurement unit. In this case, for example, the control unit may obtain the first optical characteristic by objectively measuring the optical characteristic of the eye to be inspected by the objective measurement unit after completing the subjective measurement of the optical characteristic of the eye to be inspected by the subjective measurement unit. For example, in the present embodiment, after the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit, the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit. In this way, since objective measurement is performed after subjective measurement by the subjective measurement unit, the optical characteristics measured by the objective measurement can be obtained in a state in which the change in optical characteristics due to the use of the subjective measurement unit is suppressed. Therefore, it is possible to obtain optical characteristics measured by an objective formula with changes in the optical characteristics suppressed, and to obtain more favorable adjustment information.

In addition, the eye to be inspected E can be fogged when the first optical characteristic is acquired. For example, in the measurement of the objective eye refractive power when the first optical characteristic is acquired, the eye refractive power may be preliminarily measured, and the eye to be inspected E may be fogged based on the result of the preliminary measurement. For example, the preliminary measurement may be measurement of objective eye refractive power measured by an objective measurement unit, or measurement of subjective eye refractive power measured by a subjective measurement unit.

For example, in the case of fogging, the display 31 can be moved in the direction of the optical axis L2 to fog the eye E. In this case, for example, the display 31 may be temporarily moved to a position in focus with respect to the eye E to be inspected. For example, in the case of fogging, the optical member (e.g., a lens) may be inserted into and removed from the optical path. Further, for example, in the case of fog, an optical member (e.g., a lens) disposed in the optical path may be switched. For example, after fogging, formal measurement of the eye refractive power for obtaining the first optical characteristic may be performed for the eye to be inspected having fogging. Thus, the adjustment function of the eye to be inspected can be suppressed by fogging, and the first optical characteristic can be obtained in a state where the adjustment function is suppressed.

For example, the timing of acquiring the first optical characteristic may be acquired while the optical characteristic of the eye to be inspected is subjectively measured by the subjective measurement unit. In this case, for example, the first optical characteristic may be acquired while the optical characteristic of the eye to be inspected is subjectively measured by the subjective measurement unit, and the second optical characteristic may be acquired after the first optical characteristic is acquired.

For example, the adjustment information may be information that can compare the first optical characteristic and the second optical characteristic. For example, the adjustment information may be information obtained by performing difference processing on the first optical characteristic and the second optical characteristic. For example, the adjustment information obtained by performing the difference processing may be at least one of a difference result of parameters of the first optical characteristic and the second optical characteristic, a difference image of the captured image, and the like. For example, the parameter may be at least one of a spherical power value, a cylindrical axis angle value, and the like.

For example, the difference image may be an image obtained by performing difference processing on the luminance value of each pixel between captured images. In this case, for example, when the first optical characteristic and the second optical characteristic are not changed, the luminance value of the pixel in the difference image is 0 (the difference is 0 because it is the same captured image). Also, in this case, for example, when there is a change in the first optical characteristic and the second optical characteristic, in the difference image, since the luminance value of each captured image is not 0, an image appears on the image.

For example, when performing the difference processing, an arbitrary optical characteristic can be set as an optical characteristic (reference data) used as a reference for performing the difference processing. For example, the difference result may be obtained by performing difference processing on each optical characteristic with respect to the reference data.

For example, when only the first optical characteristic and the second optical characteristic are obtained, at least one of the first optical characteristic and the second optical characteristic may be used as the reference data. For example, when optical characteristics are acquired in addition to the first optical characteristics and the second optical characteristics, any optical characteristics may be set as the reference data from among the acquired optical characteristics. In addition, for example, when the optical characteristics are set as the reference data, the reference data may be selected from among the plurality of optical characteristics by an inspector. Further, for example, when the optical characteristics are set as the reference data, the reference data may be automatically set by the acquisition means. In this case, for example, the acquisition unit may set, as the reference data, an optical characteristic having a minimum optical characteristic (the farthest point side (the side to which the adjustment of the eye is not applied)) from among the plurality of optical characteristics. Further, for example, the acquiring unit may set, as the reference data, the optical characteristic acquired immediately before the reference data of the optical characteristic is newly acquired, from among the plurality of optical characteristics. For example, when a plurality of subjective inspections are performed, the acquiring unit may set any optical characteristic as the reference data from the optical characteristics acquired by the objective measurement among the plurality of subjective inspections.

In addition, as a result of the difference, it can be displayed by a numerical value, a graph, or the like. For example, these difference results may be displayed continuously at the timing of objective measurement or multiple times of observation of the guest in real time. With such a configuration, the state of variation in optical characteristics can be checked.

In addition, for example, whether or not the change in the optical characteristics is good may be determined based on at least either one of the difference result and the difference image. In this case, for example, a determination unit may be provided that determines whether at least one of the difference result and the captured image shape change result satisfies a predetermined criterion, and outputs the determination result. For example, as a result of the determination, whether or not overcorrection is performed may be output.

For example, in the present embodiment, by obtaining the adjustment information through the comparison processing, it is possible to more easily obtain the change in the optical characteristics of the eye to be inspected during the subjective measurement period based on the adjustment information subjected to the comparison processing. Therefore, when the examiner subjectively measures the optical characteristics of the eye to be inspected by using the adjustment information, the optical characteristics of the eye to be inspected can be measured more easily and with high accuracy.

For example, the adjustment information may be the first optical characteristic and the second optical characteristic. In this case, for example, the adjustment information may be information in which the first optical characteristic and the second optical characteristic are arranged (for example, information in which the first optical characteristic is arranged in a first region and information in which the second optical characteristic is arranged in a second region different from the first region). In this case, the adjustment information may be information that can be displayed by switching between the first optical characteristic and the second optical characteristic. Also in this case, for example, as the adjustment information, information in which the first optical characteristic is superimposed on the second optical characteristic may be used. In addition, the superimposed information may be information in which at least a part of the first optical characteristic and the second optical characteristic is superimposed. For example, the adjustment information may be configured to be executed by using the above information in combination.

For example, in the present embodiment, the subjective refraction device may include an output unit. For example, the output unit outputs the adjustment information. For example, the output unit may be configured to display the adjustment information on a display. Also, for example, the output unit may be a structure of printing adjustment information. For example, the output unit may be configured to transmit the adjustment information to another device (another control unit). In this case, for example, the other device may receive the adjustment information and perform various controls based on the received adjustment information.

In the present embodiment, the control means, the acquisition means (acquisition control means), and the output means (output control means) may be used in combination. For example, the control unit, the acquisition unit, and the output unit may be provided separately and independently. Of course, each of the control units may be configured by a plurality of control units.

In the present embodiment, a subjective optometry apparatus that objectively measures the optical characteristics of an eye to be inspected by an objective measurement unit while subjectively measuring the optical characteristics of the eye to be inspected by the subjective measurement unit is taken as an example and described, but the present invention is not limited to this. The subjective refraction device may be configured to be able to acquire the adjustment information. In this case, for example, the control unit may acquire the first optical characteristic by objectively measuring the optical characteristic of the eye to be inspected by the objective measurement unit, and acquire the second optical characteristic by objectively measuring the optical characteristic of the eye to be inspected by the objective measurement unit at a timing different from a timing at which the first optical characteristic is acquired. For example, the acquisition unit may acquire adjustment information based on the first optical characteristic and the second optical characteristic. For example, the output unit may output the adjustment information. For example, in the present embodiment, the optical characteristics of the eye to be inspected are objectively measured to obtain the first optical characteristics, and the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit to obtain the second optical characteristics at a timing different from the timing at which the first optical characteristics are obtained. Adjustment information based on the acquired first optical characteristic and second optical characteristic is acquired, and the adjustment information is output. With this configuration, the examiner can acquire the state of change in the optical characteristics of the eye to be examined when using the subjective refraction device. Thus, when the eye to be inspected is measured using the subjective refraction device, the eye to be inspected can be measured with high accuracy.

< correction processing based on adjustment information >

For example, in the present embodiment, the subjective refraction device may include setting means (e.g., the control unit 70). For example, in the present embodiment, the subjective refraction device may include first correction means (e.g., the control unit 70 and the correction optical system 60). For example, the setting unit may set, based on the adjustment information, a correction amount for correcting a change in the adjustment state of the eye to be inspected that occurs while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit. The correction amount is preferably set to a correction amount that can cancel out the change in the adjustment state of the eye to be examined, but is not limited to this as long as it is a correction amount that does not hinder the subjective examination. For example, the first correcting means may perform correction for canceling out the change in the adjustment state of the eye to be examined caused by the subjective expression measuring means, based on the correction amount set by the setting means. For example, in the present embodiment, a correction amount for correcting the change in the adjustment state of the eye to be examined is set based on the adjustment information, and correction for canceling the change in the adjustment state of the eye to be examined that occurs in the subjective expression measurement unit is performed based on the correction amount. Thus, even when the optical characteristics of the eye to be inspected change during the subjective measurement of the optical characteristics of the eye to be inspected by the subjective measurement means, the measurement can be performed in a state in which the change in the optical characteristics is cancelled out. Thus, when the optical characteristics of the eye to be inspected are subjectively measured, the optical characteristics of the eye to be inspected can be easily and accurately measured.

For example, the correction amount may be made into a table set in advance for each parameter of the adjustment information, and the made table is stored in a memory (e.g., the memory 72). In this case, for example, the setting unit may call the correction amount corresponding to the adjustment state from the memory and set. For example, the correction amount may be obtained by storing a calculation expression for the correction amount for each parameter for deriving the adjustment information in a memory and using the calculation expression.

For example, the first correction unit may be configured such that the correction optical system also serves as the first correction unit. For example, in the present embodiment, since the correction optical system also serves as the first correction means, it is not necessary to perform complicated control or separately provide correction means for offsetting the change in the adjustment state, and thus it is possible to correct the optical aberration with a simple configuration. For example, as the first correction unit, a dedicated correction unit may be additionally provided. In this case, for example, as the first correction unit, a configuration may be adopted in which at least any one of a spherical lens, a cylindrical lens, a crossed cylindrical lens, a rotating prism, a wave surface modulation element, and the like is used. Of course, for example, a member different from the above-described member may be used as the first correcting means.

In the present embodiment, the control means, the setting means (setting control means), and the control means of the first correction means may be shared. For example, the control unit, the setting unit, and the control unit of the first correcting unit may be separately provided. Of course, each of the control units may be configured by a plurality of control units.

< correction of Objective measurement result based on correction information of correction optical System >

In the present embodiment, for example, as the subjective refraction device, a correction optical system may be disposed in the optical path of the measurement optical system. Of course, the subjective refraction device may be configured such that the correction optical system is not disposed in the optical path of the measurement optical system.

For example, when the correction optical system is disposed in the optical path of the measurement optical system, the subjective refraction device may include a second correction unit (e.g., the control unit 70). For example, the second correction unit may correct a measurement result obtained by objectively measuring the eye to be inspected by the objective measurement unit based on the correction information of the correction optical system. For example, the second correction unit may correct a measurement result obtained by objectively measuring the eye to be inspected by the objective measurement unit, based on the correction information of the correction optical system, so as to cancel out the correction state of the correction optical system. For example, in the present embodiment, when a correction optical system is present in the optical path of the objective measurement unit, it is possible to correct the variation in optical characteristics caused by the measurement light beam objectively measured passing through the correction optical system. Thus, even when objective measurement is performed during correction by the correction optical system, optical characteristics can be obtained with high accuracy. For example, in particular, when acquiring adjustment information based on at least two optical characteristics acquired by objective measurement, the present technique is more effective because it is difficult to compare the optical characteristics due to variation between the optical characteristics.

For example, the second correction unit may correct the optical characteristic as the measurement result. When the first optical characteristic and the second optical characteristic are obtained as the optical characteristics, at least one of the first optical characteristic and the second optical characteristic may be corrected. Also, for example, the second correction unit may correct the adjustment information as the measurement result.

In the present embodiment, the control means and the second correction means (second correction control means) may be used in combination. Also, for example, a structure may be possible in which the control unit is provided separately from the second correction unit. Of course, each of the control units may be configured by a plurality of control units.

In the present embodiment, the configuration in which the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit can be used for subjective examination (anterior ocular examination) in which the optical characteristics of the eye to be inspected are subjectively measured in a state in which the eye to be inspected is wearing eyeglasses. In this case, for example, the objective measurement unit may objectively measure the optical characteristic of the eye to be examined while the eye to be examined is wearing glasses, thereby obtaining the first optical characteristic, and the objective measurement unit may objectively measure the second optical characteristic while the objective measurement unit subjectively measures the optical characteristic of the eye to be examined. Further, for example, adjustment information based on the acquired first optical characteristic and second optical characteristic may be acquired, and the adjustment information may be output.

For example, when at least either one of the difference result and the difference image is obtained as the adjustment information, it is possible to determine whether or not the change in the optical characteristic is good based on at least either one of the difference result and the difference image, for example. In this case, for example, as a result of the determination, whether or not overcorrection is output. For example, whether or not the currently worn eyeglasses are overcorrected can be confirmed by outputting whether or not the eyeglasses are overcorrected.

For example, when the subject's eye is wearing glasses, the optical characteristics can be acquired by presenting a far vision optotype at infinity, and presenting an optotype at a positive number of degrees compared to the far vision optotype at infinity. In this case, the adjustment state can be acquired based on each calculated optical characteristic. This makes it possible to confirm whether or not the currently worn eyeglasses are overcorrected.

< initial value setting for subjective examination >

In the present embodiment, for example, the subjective refraction device may include an initial value setting means (e.g., the control unit 70). In this case, for example, the control unit may obtain the optical characteristics of the eye to be inspected by objectively measuring the optical characteristics of the eye to be inspected by the objective measurement unit after the subjective measurement of the optical characteristics of the eye to be inspected is started by the subjective measurement unit. For example, the initial value setting means may set the optical characteristics of the eye to be inspected, which are objectively measured by the control means, to the initial values of the correction optical system when the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement means. For example, the optical characteristics set as the initial values include at least one of spherical power, cylindrical axis, polarization characteristics, aberration amount, and the like. Of course, optical characteristics other than those described above may be set as the initial values. For example, in the present embodiment, after the subjective measurement of the optical characteristics of the eye to be inspected is started by the subjective measurement unit, the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit, and the optical characteristics of the eye to be inspected are acquired. The objectively measured optical characteristics of the eye to be inspected are set as initial values of the correction optical system when the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit. With this configuration, it is possible to quickly measure the optical characteristics of the eye to be examined without waiting until objective measurement is completed and performing subjective measurement by the subjective examination apparatus.

For example, the start of the subjective measurement may be in a state where the control of the subjective measurement is started. More specifically, for example, the start of the subjective measurement may be at least one of a state in which projection of the sighting target light beam is started, a state in which the inspection program is started, a state in which operation of an operation unit of the subjective inspection apparatus is started, a state in which driving of the correction optical system is started, and the like.

For example, in the subjective examination set as the initial value, the initial value setting means may set the optical characteristics of the eye to be examined, which are objectively measured, as the initial value in the subjective examination performed at the start of the guest observation. In this case, for example, the initial value setting means sets the optical characteristics of the eye to be inspected, which are objectively measured by the objective measurement means, to the initial values of the correction optical system in the subjective measurement of the optical characteristics of the eye to be inspected, which is performed by the subjective measurement means before the start of the objective measurement by the objective measurement means. For example, in the present embodiment, the optical characteristics of the eye to be inspected, which are objectively measured by the objective measurement unit, are set as initial values of the correction optical system in the subjective measurement of the optical characteristics of the eye to be inspected, which is performed by the subjective measurement unit before the start of the objective measurement by the objective measurement unit. With this configuration, it is possible to quickly perform subjective measurement by the subjective inspection apparatus.

For example, in the subjective examination set as the initial value, the initial value setting means may set the optical characteristic of the eye to be inspected, which is objectively measured, as the initial value in a subjective examination (second subjective examination) different from the subjective examination (first subjective examination) performed at the time of starting the guest observation. In this case, for example, the control unit may perform the second subjective measurement of subjectively measuring the optical characteristic of the eye to be inspected by the subjective-type measuring unit again after the first subjective measurement of subjectively measuring the optical characteristic of the eye to be inspected by the subjective-type measuring unit is performed. For example, the control unit may objectively measure the optical characteristics of the eye to be inspected by the objective measurement unit after the first subjective measurement is started. For example, the initial value setting means may set the optical characteristics of the eye to be examined objectively measured by the objective measurement means as the initial value of the second subjective measurement. For example, in the present embodiment, after the first subjective measurement for subjectively measuring the optical characteristics of the eye is performed by the subjective measurement unit, the second subjective measurement for subjectively measuring the optical characteristics of the eye is performed again by the subjective measurement unit. After the first subjective measurement is started, the optical characteristics of the eye to be examined are objectively measured by the objective measurement unit, and the objectively measured optical characteristics of the eye to be examined are set as initial values of the second subjective measurement. With this configuration, even when the main observation timing is performed again, the initial value is already obtained at the time of a different subjective measurement, and therefore, the measurement can be performed quickly.

For example, the first subjective inspection may be a subjective inspection that measures the same optical characteristics as those measured by the second subjective inspection. Also, for example, the first subjective inspection may be a subjective inspection that measures an optical characteristic different from an optical characteristic measured by the second subjective inspection. In this case, for example, as the first subjective examination, a subjective examination (naked eye examination) may be used in which optical characteristics of the naked eye of the eye to be examined are subjectively measured. Further, for example, the first subjective examination may be a subjective examination (front eyewear examination) which subjectively measures optical characteristics when the subject's eye wears glasses. In these cases, for example, the first subjective measurement may be a subjective measurement of subjectively measuring the optical characteristic of the eye to be inspected in a non-corrected state in which the optical characteristic of the target light beam is not changed by the correction optical system, and the second subjective measurement may be a subjective measurement of subjectively measuring the optical characteristic of the eye to be inspected by changing the optical characteristic of the target light beam by the correction optical system.

In the present embodiment, the subjective refraction device may use the target light flux of the projection optical system as a fixation mark for fixing the eye to be inspected when the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit. For example, in the present embodiment, the target light flux of the projection optical system in the subjective detection unit is set as a fixation target for fixation of the eye to be inspected when the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit. With this configuration, the number of components can be reduced, and the device can be configured with a simple configuration. In addition, the extra space can be reduced, and the device can be miniaturized.

In the present embodiment, the control means and the initial value setting means (initial value setting control means) may be used in common. Further, for example, the control unit may be provided separately from the initial value setting unit. Of course, each of the control units may be configured by a plurality of control units.

< example >

The subjective refraction device of the present embodiment will be described below. For example, fig. 1 is an external view of the subjective refraction device 1 of the present embodiment. For example, the subjective refraction device 1 of the present embodiment includes a housing 2, a presentation window 3, an operation unit (monitor) 4, a lower jaw 5, a base 6, an imaging optical system 100, and the like. For example, the housing 2 internally houses the components. For example, a measurement unit (dotted line portion in fig. 1) 7 (described in detail later) is provided inside the housing 2. For example, the measurement unit 7 includes a right-eye measurement unit (right-eye measurement unit) 7R and a left-eye measurement unit (left-eye measurement unit) 7L. In the present embodiment, the right-eye measurement unit 7R and the left-eye measurement unit 7L are provided with the same members. That is, the subjective refraction device 1 includes a pair of left and right subjective-type measurement units and a pair of left and right objective-type measurement units. Of course, the right-eye measurement unit 7R and the left-eye measurement unit 7L may be different in at least part of the members.

For example, the presentation window 3 is used to present optotypes to the person to be examined. For example, the optotype beams from the right-eye measurement unit 7R and the left-eye measurement unit 7L are projected to the eye E via the presentation window 3.

The monitor (display) 4 is, for example, a touch panel. That is, in the present embodiment, the monitor 4 functions as an operation unit (controller). The monitor 4 outputs a signal corresponding to the input operation instruction to a control unit 70 described later. Of course, the monitor 4 and the operation unit may be provided separately. For example, the operation unit may be configured using at least any one of operation means such as a mouse, a joystick, and a keyboard.

For example, the monitor 4 may be a display mounted on the main body of the subjective refraction device 1, or may be a display connected to the main body of the subjective refraction device 1. Of course, the touch panel type may not be used. For example, a display of a personal computer (hereinafter, referred to as "PC") may be used. Also, for example, a plurality of displays may be used in combination. For example, the measurement result is displayed on the monitor 4.

For example, the mandibular stage 5 is used to keep the distance between the eye E to be examined and the subjective refraction device 1 constant or to suppress large shaking of the face. For example, the lower jaw 5 and the housing 2 are fixed to the base 6. In the present embodiment, the lower jaw 5 is used to keep the distance between the eye E and the subjective refraction device 1 constant, but the present invention is not limited to this. The distance between the eye E and the subjective refraction device 1 may be constant. For example, as a configuration for keeping the distance between the eye E and the subjective refraction device 1 constant, a configuration using a forehead rest, a face rest, or the like may be mentioned.

For example, the imaging optical system 100 is composed of an imaging element and a lens, which are not shown. For example, a photographing optical system is used to photograph the face of an eye to be inspected.

< measuring Unit >

Fig. 2 is a diagram illustrating the structure of the measurement unit 7. In the present embodiment, the left-eye measurement unit 7L will be described by way of example. In the present embodiment, the right-eye measurement unit 7R has the same configuration as the left-eye measurement unit 7L, and therefore, the description thereof is omitted. For example, the left-eye measurement unit 7L includes a subjective measurement optical system 25, an objective measurement optical system 10, a first marker projection optical system 45, a second marker projection optical system 46, and an observation optical system 50.

< subjective optical System >

For example, the subjective measurement optical system 25 is used as a part of a configuration of a subjective measurement unit for subjectively measuring an optical characteristic of an eye to be inspected (details will be described later). For example, the optical characteristics of the eye to be inspected include an eye refractive power, a contrast sensitivity, a binocular vision function (for example, an amount of strabismus, a stereoscopic vision function, and the like), and the like. In the present embodiment, a subjective measurement unit that measures the eye refractive power of an eye to be examined will be described as an example. For example, the subjective measurement optical system 25 includes a projection optical system (target projection system) 30, a correction optical system 60, and a correction optical system 90.

For example, the projection optical system 30 projects the sighting mark light beam toward the eye E to be inspected. For example, the projection optical system 30 includes a display 31, a projection lens 33, a projection lens 34, a mirror 36, a dichroic mirror 35, a dichroic mirror 29, and the objective lens 14. For example, the sighting target light beam projected from the display 31 is projected to the eye E via the optical members in the order of the light projecting lens 33, the light projecting lens 34, the reflecting mirror 36, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14.

For example, an examination target such as a bright-ring visual target, a fixation target (used at guest observation timing or the like described later) for fixing the eye E, and the like are displayed on the display 31. For example, a sighting mark beam from the display 31 is projected toward the eye to be inspected E. In this embodiment, the following description will be given taking a case where an LCD is used as the display 31 as an example.

For example, the correction optical system 60 includes an astigmatism correction optical system 63 and a drive mechanism 39.

For example, the astigmatism correction optical system 63 is disposed between the light projecting lens 34 and the light projecting lens 33. For example, the astigmatism correction optical system 63 is used to correct the cylinder power, cylinder axis, and the like of the eye to be inspected. For example, the astigmatism correction optical system 63 is composed of two positive

cylindrical lenses

61a and 61b having the same focal length. The

cylindrical lenses

61a and 61b are driven by the

rotation mechanisms

62a and 62b to rotate independently about the optical axis L2. In the present embodiment, the description has been given taking as an example a configuration in which the astigmatism correction optical system 63 uses two positive

cylindrical lenses

61a and 61b, but the present invention is not limited to this. The astigmatism correcting optical system 63 may be configured to correct the cylinder power, the cylinder axis, and the like. For example, the correction lens may be inserted into or removed from the optical path of the projection optical system 30.

For example, the display 31 is integrally moved in the direction of the optical axis L2 by a driving mechanism 39 including a motor and a slide mechanism. For example, in the case of subjective measurement, the spherical power of the eye to be examined is corrected by optically changing the position (presentation distance) at which the optotype is presented to the eye to be examined by moving the display 31. That is, the display 31 moves to form a spherical power correction optical system. For example, in the objective measurement, the movement of the display 31 causes the eye E of the subject to be fogged. The spherical power correction optical system is not limited to this. For example, the spherical power correction optical system may have a plurality of optical elements and perform correction by arranging the optical elements in the optical path. Further, for example, a lens disposed in the optical path may be moved in the optical axis direction.

In the present embodiment, a description is given of an example of a correction optical system that corrects spherical power, cylindrical power, and cylindrical axis, but the present invention is not limited to this. For example, a correction optical system for correcting the prism value may be provided. By the correction optical system having the prism value, even if the eye to be inspected is an oblique eye, the correction can be performed so that the sighting mark light beam is projected to the eye to be inspected.

In the present embodiment, the astigmatism correction optical system 63 having the cylindrical power and the cylindrical axis and the spherical power correction optical system (for example, the drive unit 39) are provided separately, but the present invention is not limited thereto. For example, the correction optical system may be any one having a structure in which the correction optical system corrects spherical power, cylindricity, and cylindrical axis. For example, the corrective optical system may be an optical system that modulates a wave surface. Further, for example, the correction optical system may be an optical system that corrects spherical power, cylindrical axis, or the like. In this case, for example, the correction optical system may be configured to include a lens disk in which a plurality of optical elements (spherical lens, cylindrical lens, dispersion prism, and the like) are arranged on the same circumference. The lens disk is controlled to rotate by a drive unit (such as an actuator), and thereby an optical element desired by the examiner is arranged on the optical axis L2.

Further, the optical element (for example, a cylindrical lens, a crossed cylindrical lens, a rotating prism, or the like) disposed on the optical axis L2 is rotationally controlled by the driving unit, and thereby the optical element is disposed on the optical axis L2 at a rotation angle desired by the examiner. Switching of the optical elements disposed on the optical axis L2 and the like can be performed by operation of an input unit (operation unit) such as the monitor 4.

The lens disk is composed of one lens disk or a plurality of lens disks. When a plurality of lens discs are arranged, a driving section corresponding to each lens disc is provided. For example, each lens disk is provided with an opening (or a 0D lens) and a plurality of optical elements as a lens disk group. Representative examples of the types of lens discs include a spherical lens disc having a plurality of spherical lenses with different powers, a cylindrical lens disc having a plurality of cylindrical lenses with different powers, and an auxiliary lens disc having a plurality of types of auxiliary lenses. At least one of a red filter/green filter, a prism, a crossed cylindrical lens, a polarizing plate, a madoks lens, and an auto-crossed cylindrical lens is disposed on the auxiliary lens disk. The cylindrical lens may be arranged to be rotatable about the optical axis L2 by the driving unit, and the rotating prism and the cross cylindrical lens may be arranged to be rotatable about the respective optical axes by the driving unit.

For example, the correction optical system 90 is disposed between the objective lens 14 and a deflection mirror 81 described later. For example, the correction optical system 90 is used to correct optical aberration generated in the subjective measurement unit. The correction optical system 90 is used to correct astigmatism in optical aberration, for example. For example, the correction optical system 90 is constituted by two positive

cylindrical lenses

91a, 91b having equal focal lengths. For example, the correction optical system 90 corrects astigmatism by adjusting the cylinder power, the cylinder axis. The

cylindrical lenses

91a and 91b are driven by the

rotation mechanisms

92a and 92b to rotate independently about the optical axis L3. In the present embodiment, the description has been given taking as an example a configuration in which the correction optical system 90 uses two positive

cylindrical lenses

91a and 91b, but the present invention is not limited to this. The correction optical system 90 may be configured to correct astigmatism. For example, the correction lens may be taken out or put in with respect to the optical axis L3. In the present embodiment, a configuration in which the correction optical system 90 is separately disposed is exemplified, but the present invention is not limited thereto. The correction optical system 60 may also serve as the correction optical system 90. In this case, the cylinder power and the cylinder axis of the eye to be examined are corrected in accordance with the amount of astigmatism. That is, the correction optical system 60 is driven to correct the cylinder power and the cylinder axis in consideration of (corrected) the amount of astigmatism. In this way, by using the correction optical system 60 as the correction optical system 90, for example, complicated control or a separately provided correction optical system for optical aberration is not required, and therefore, optical aberration can be corrected with a simple configuration.

< Objective optical System >

For example, the objective measurement optical system 10 is used as a part of a configuration of an objective measurement unit for objectively measuring an optical characteristic of an eye to be inspected (details will be described later). For example, the optical characteristics of the eye to be examined include the eye refractive power, the eye axial length, the corneal shape, and the like. In the present embodiment, an objective measurement unit for measuring the eye refractive power of an eye to be examined will be described as an example.

For example, the objective measurement optical system 10 includes a projection optical system 10a, a light receiving optical system 10b, and a correction optical system 90. For example, the projection optical system (projection optical system) 10a projects a point-like measurement mark onto the fundus of the eye E via the pupil center of the eye E. For example, the light receiving optical system 10b extracts fundus reflection light reflected from the fundus annularly via the pupil periphery, and causes the two-dimensional imaging device to image an annular fundus reflection image.

For example, the projection optical system 10a includes a measurement light source 11, a relay lens 12, an aperture mirror 13, a prism 15, a driving unit (motor) 23, a dichroic mirror 35, a dichroic mirror 29, and an objective lens 14, which are disposed on the optical axis L1 of the objective measurement optical system 10. The prism 15 is, for example, a beam deflecting member. For example, the driving unit 23 is a rotating unit that drives the prism 15 to rotate around the optical axis L1. For example, the light source 11 and the fundus of the eye are in a conjugate relationship, and the aperture of the aperture mirror 13 and the pupil are in a conjugate relationship. For example, the prism 15 is disposed at a position deviated from a position conjugate with the pupil of the eye E, and decenters the passing light flux with respect to the optical axis L1. Instead of the prism 15, a parallel plane plate may be disposed to be inclined on the optical axis L1 as a beam deflecting member.

For example, the dichroic mirror 35 is shared between the optical path of the subjective measurement optical system 25 and the optical path of the objective measurement optical system 10. That is, for example, the dichroic mirror 35 makes the optical axis L2 of the subjective measurement optical system 25 coaxial with the optical axis L1 of the objective measurement optical system 10. For example, the beam splitter 29 as an optical path branching member reflects the light beam generated by the subjective measurement optical system 25 and the measurement light generated by the projection optical system 10a, and guides the reflected light to the eye to be inspected.

For example, the light receiving optical system 10b shares the objective lens 14, the dichroic mirror 29, the dichroic mirror 35, the prism 15, and the aperture mirror 13 of the projection optical system 10a, and includes a relay lens 16, a reflecting mirror 17, which are arranged in an optical path in the reflection direction of the aperture mirror 13, a light receiving diaphragm 18, a collimator lens 19, an annular lens 20, and a two-dimensional imaging device 22 (hereinafter, referred to as an imaging device 22), which is arranged in an optical path in the reflection direction of the reflecting mirror 17. For example, the light receiving diaphragm 18 and the imaging element 22 are in conjugate relation with the eye fundus of the subject. For example, the annular lens 20 is composed of a lens portion formed annularly and a light shielding portion in which a light shielding coating is applied to a region other than the lens portion, and has a positional relationship optically conjugate with the pupil of the eye to be inspected. For example, an output from the imaging element 22 is input to the arithmetic control unit 70 (hereinafter, referred to as a control unit 70).

For example, the dichroic mirror 29 reflects the reflected light of the measurement light from the projection optical system 10a generated at the eye fundus of the subject toward the light receiving optical system 10. The dichroic mirror 29 transmits the anterior ocular observation light and the alignment light, for example, and guides the same to the observation optical system 50. For example, the dichroic mirror 35 reflects the reflected light of the measurement light from the projection optical system 10a generated at the eye fundus of the subject toward the light receiving optical system 10.

The objective measurement optical system 10 is not limited to the above configuration, and a known configuration such as the following configuration may be used: an annular measurement mark is projected from the pupil periphery to the fundus oculi, fundus oculi reflection light is extracted from the pupil center, and an annular fundus oculi reflection image is received by a two-dimensional imaging device.

The objective measurement optical system 10 is not limited to the above configuration, and may be a measurement optical system including a projection optical system that projects measurement light to the fundus of the eye of the subject, and a light receiving optical system that receives reflected light obtained by reflecting the measurement light at the fundus via a light receiving element. For example, the optical system for measuring ocular refractive power may be configured to include a charcot-hartmann sensor. Of course, other measurement type devices (for example, a phase difference type device that projects a slit) may be used.

For example, the light source 11 of the projection optical system 10a, the light receiving diaphragm 18 of the light receiving optical system 10b, the collimator lens 19, the annular lens 20, and the imaging element 22 are integrally movable in the optical axis direction. In the present embodiment, for example, the light source 11 of the projection optical system 10a, the light receiving diaphragm 18 of the light receiving optical system 10b, the collimator lens 19, the annular lens 20, and the imaging element 22 are moved integrally in the direction of the optical axis L1 by the driving mechanism 39 that drives the display 31. That is, the display 31, the light source 11 of the projection optical system 10a, and the light receiving diaphragm 18, the collimator lens 19, the annular lens 20, and the imaging element 22 of the light receiving optical system 10b are integrally moved in synchronization with each other as the driving unit 95. Of course, a separate drive may be used. For example, the driving unit 95 moves a part of the objective measurement optical system 10 in the optical axis direction so that the outer annular light flux is incident on the imaging element 22 in the meridian direction. That is, by moving a part of the objective measurement optical system 10 in the direction of the optical axis L1 in accordance with the spherical refractive error (spherical refractive power) of the eye to be inspected, the spherical refractive error is corrected so that the light source 11, the light receiving diaphragm 18, and the imaging device 22 are optically conjugate with respect to the fundus of the eye to be inspected. The movement position of the drive mechanism 39 is detected by a potentiometer, not shown. In addition, the aperture mirror 13 and the ring lens 20 are arranged so as to conjugate with the pupil of the eye to be inspected at a constant magnification regardless of the movement amount of the movable unit 25.

In the above configuration, the measurement light emitted from the light source 11 forms a point-like point light source image on the fundus of the eye to be inspected via the relay lens 12, the aperture mirror 13, the prism 15, the dichroic mirror 35, the beam splitter 29, and the objective lens 14. At this time, the pupil projection image (projection light beam on the pupil) of the hole of the aperture mirror 13 is eccentrically rotated at high speed by the prism 15 rotating around the optical axis. The point light source image projected on the fundus is reflected and scattered to be emitted to the eye to be inspected, condensed by the objective lens 14, passed through the beam splitter 29, dichroic mirror 35, high-speed rotating prism 15, aperture mirror 13, relay lens 16, and reflection mirror 17, and condensed again at the position of the light receiving aperture 18, and an annular image is formed on the imaging element 22 by the collimator lens 19 and the annular lens 20.

For example, the prism 15 is disposed on a common optical path between the projection optical system 10a and the light receiving optical system 10 b. Therefore, since the reflected light beam from the fundus passes through the prism 15 as in the projection optical system 10a, the optical systems thereafter perform reverse scanning as if there were no eccentricity of the projection light beam or the reflected light beam (light receiving beam) on the pupil.

For example, the correction optical system 90 also serves as the subjective measurement optical system 25. Of course, a correction optical system used in the objective measurement optical system 10 may be separately provided.

< first marker projection optical System and second marker projection optical System >

In the present embodiment, the first marker projection optical system 45 and the second marker projection optical system 46 are disposed between the correction optical system 90 and the deflection mirror 81. Of course, the arrangement positions of the first marker projection optical system 45 and the second marker projection optical system 46 are not limited thereto.

The first marker projection optical system 45 has a plurality of infrared light sources arranged concentrically around the optical axis L3 at 45-degree intervals, and is arranged symmetrically with respect to a vertical plane passing through the optical axis L3. The first marker projection optical system 45 emits near infrared light for projecting the alignment marker to the cornea of the eye to be inspected. The second marker projection optical system 46 is disposed at a position different from the first marker projection optical system 45 and includes 6 infrared light sources. In this case, the first marker projection optical system 45 is configured to project the marker at infinity onto the cornea of the eye to be inspected E from the left-right direction, and the second marker projection optical system 46 is configured to project the marker at finite latitude onto the cornea of the eye to be inspected E from the up-down direction or the oblique direction. In the present drawing of fig. 2, for the sake of simplicity, only a part of the first marker projection optical system 45 and a part of the second marker projection optical system 46 are illustrated. In addition, the second marker projection optical system 46 may also be used as anterior eye illumination for illuminating the anterior eye of the eye to be examined. Further, the marker may be used as a marker for measuring the shape of the cornea. The first marker projection optical system 45 and the second marker projection optical system 46 are not limited to point light sources. For example, a ring-shaped light source or a linear light source may be used.

< Observation optical System >

The observation optical system (imaging optical system) 50 shares the objective lens 14 and the dichroic mirror 29 in the subjective measurement optical system 25 and the objective measurement optical system 10, and includes an imaging lens 51 and a two-dimensional imaging element 52. For example, the imaging element 52 has an imaging surface arranged at a position substantially conjugate to the anterior segment of the eye to be examined. For example, an output from the imaging element 52 is input to the control unit 70. Thereby, the anterior segment image of the eye to be examined is captured by the two-dimensional imaging device 52 and displayed on the monitor 4. The observation optical system 50 also serves as an optical system for detecting an alignment marker image formed on the cornea of the eye to be examined by the first marker projection optical system 45 and the second marker projection optical system 46, and the position of the alignment marker image is detected by the control unit 70.

< internal Structure of subjective optometry apparatus >

The internal structure of the subjective refraction device 1 is explained below. Fig. 3 is a schematic configuration diagram of the inside of the subjective refraction device 1 of the present embodiment as viewed from the front direction (direction a of fig. 1). Fig. 4 is a schematic configuration diagram of the inside of the subjective refraction device 1 of the present embodiment as viewed from the side direction (direction B of fig. 1). Fig. 5 is a schematic configuration diagram of the inside of the subjective refraction device 1 of the present embodiment as viewed from the top direction (direction C of fig. 1). In fig. 3, for convenience of explanation, the optical axis showing the reflection of the half mirror 84 is omitted. In fig. 4, for convenience of explanation, only the optical axis of the left-eye measurement unit 7L is shown. In fig. 5, for convenience of explanation, only the optical axis of the left-eye measurement unit 7L is shown.

For example, the subjective refraction device 1 includes a subjective measurement unit and an objective measurement unit. For example, the subjective measurement unit includes the measurement unit 7, the deflection mirror 81, the drive unit 83, the drive unit 82, the half mirror 84, and the concave mirror 85. Of course, the subjective measurement unit is not limited to this configuration. For example, the half mirror 84 may not be provided. In this case, the light beam may be irradiated from an oblique direction with respect to the optical axis of the concave mirror 85, and the reflected light beam may be guided to the eye E. For example, the objective measurement unit is composed of the measurement unit 7, the deflection mirror 81, the half mirror 84, and the concave mirror 85. Of course, the objective measurement unit is not limited to this configuration. For example, the half mirror 84 may not be provided. In this case, the light beam may be irradiated from an oblique direction with respect to the optical axis of the concave mirror 85, and the reflected light beam may be guided to the eye E.

The subjective refraction device 1 includes a right-eye drive unit 9R and a left-eye drive unit 9L, and is capable of moving the right-eye measurement unit 7R and the left-eye measurement unit 7L in the X direction, respectively. For example, the distance between the deflection mirror 81 and the measurement unit 7 is changed by the movement of the right-eye measurement unit 7R and the left-eye measurement unit 7L, and the position where the sighting mark light beam appears in the Z direction is changed. This makes it possible to perform adjustment in the Z direction so as to guide the eye-targeted light beam corrected by the correction optical system 60 to the eye to be inspected and form an image of the eye-targeted light beam corrected by the correction optical system 60 on the fundus oculi of the eye to be inspected.

For example, the deflection mirror 81 includes a right-eye deflection mirror 81R and a left-eye deflection mirror 81L provided in a left-right pair. For example, the deflecting mirror 81 is disposed between the correction optical system 60 and the eye to be inspected. That is, the correction optical system 60 includes a right-eye correction optical system and a left-eye correction optical system provided in a left-right pair, the right-eye deflection mirror 81R is disposed between the right-eye correction optical system and the right eye ER, and the left-eye deflection mirror 81L is disposed between the left-eye correction optical system and the left eye ER. For example, the deflecting mirror 81 is preferably disposed at a pupil conjugate position.

For example, the right-eye deflecting mirror 81R reflects the light beam projected from the right-eye measuring unit 7R and guides the light beam to the right eye ER. Then, for example, the reflected light reflected by the right eye ER is reflected and guided to the right eye measurement unit 7R. For example, the left-eye deflecting mirror 81L reflects the light beam projected from the left-eye measuring unit 7L and guides the light beam to the left eye EL. Then, for example, the reflected light reflected by the left eye EL is reflected and guided to the left eye measurement unit 7L. In the present embodiment, a description is given of an example in which the deflecting mirror 81 is used as a deflecting member that reflects the light beam projected from the measurement unit 7 and guides the light beam to the eye to be inspected E, but the present invention is not limited to this. Any deflecting means may be used as long as it reflects the light beam projected from the measuring unit 7 and guides the light beam to the eye E. Examples of the deflecting member include a prism and a lens.

For example, the driving unit 83 is constituted by a motor (driving unit) or the like. For example, the driving unit 83 has a driving unit 83R for driving the deflection mirror 81R for the right eye, and a driving unit 83L for driving the deflection mirror 81L for the left eye. For example, the deflection mirror 81 can be moved in the X direction by driving of the driving unit 83. For example, the distance between the right-eye deflecting mirror 81R and the left-eye deflecting mirror 81L can be changed by the movement of the right-eye deflecting mirror 81R and the left-eye deflecting mirror 81L, and the distance in the X direction between the right-eye optical path and the left-eye optical path can be changed in accordance with the interpupillary distance of the eye to be examined.

For example, the driving unit 82 is constituted by a motor (driving unit) or the like. For example, the driving unit 82 has a driving unit 82R for driving the deflection mirror 81R for the right eye, and a driving unit 82L for driving the deflection mirror 81L for the left eye. For example, the deflection mirror 81 is rotationally moved by driving of the driving unit 82. For example, the driving unit 82 rotates the deflection mirror 81 about a rotation axis in the horizontal direction (X direction) and a rotation axis in the vertical direction (Y direction). That is, the drive unit 82 rotates the deflection mirror 81 in the XY direction. In addition, the rotation of the deflection mirror 81 may be one of the horizontal direction or the vertical direction. Further, a plurality of deflecting mirrors may be provided in the right-eye optical path and the left-eye optical path, respectively. For example, a configuration may be adopted in which two deflecting mirrors (for example, two deflecting mirrors in the right-eye optical path) are provided in the right-eye optical path and the left-eye optical path, respectively. In this case, one deflection mirror may be rotated in the X direction, and the other deflection mirror may be rotated in the Y direction. For example, the apparent light beam for forming the image of the correction optical system 60 in front of the eye to be inspected is deflected by the rotational movement of the deflection mirror 81, whereby the formation position of the image can be optically corrected.

For example, the concave mirror 85 is shared by the right-eye measurement unit 7R and the left-eye measurement unit 7L. For example, the concave mirror 85 is shared by a right-eye optical path including the right-eye correction optical system and a left-eye optical path including the left-eye correction optical system. That is, the concave mirror 85 is disposed at a position where both the right-eye optical path including the right-eye correction optical system and the left-eye optical path including the left-eye correction optical system pass. Of course, the concave mirror 85 may not be a shared structure. A concave mirror may be provided in each of the right-eye optical path including the right-eye correction optical system and the left-eye optical path including the left-eye correction optical system. For example, the concave mirror 85 guides the sighting target light beam passing through the correction optical system to the eye to be inspected, and forms an image of the sighting target light beam passing through the correction optical system in front of the eye to be inspected. In the present embodiment, the configuration using the concave mirror 85 is exemplified, but the present invention is not limited thereto. Various optical components may be used. For example, as the optical member, a lens, a plane mirror, or the like can be used.

For example, the concave mirror 85 is used in both the subjective measurement unit and the objective measurement unit. For example, the optotype beam projected from the subjective measurement optical system 25 is projected onto the eye to be inspected via the concave mirror 85. Then, for example, the measurement light projected from the objective measurement optical system 10 is projected to the eye to be inspected via the concave mirror 85. For example, the reflected light of the measurement light projected from the objective measurement optical system 10 is guided to the light receiving optical system 10b of the objective measurement optical system 10 via the concave mirror 85. In the present embodiment, the reflected light of the measurement light from the objective measurement optical system 10 is guided to the light receiving optical system 10b of the objective measurement optical system 10 through the concave mirror 85, but the present invention is not limited thereto. The reflected light of the measurement light from the objective measurement optical system 10 may not pass through the concave mirror 85.

More specifically, for example, in the present embodiment, at least the optical axis from the concave mirror 85 to the eye E in the subjective measurement unit and the optical axis from the concave mirror 85 to the eye E in the objective measurement unit are coaxially formed. In the present embodiment, the optical axis L2 of the subjective measurement optical system 25 and the optical axis L1 of the objective measurement optical system 10 are combined by the dichroic mirror 35 to be coaxial.

The optical path of the subjective measurement unit is described below. For example, the subjective measurement unit reflects the visual target beam having passed through the correction optical system 60 toward the eye to be inspected by the concave mirror 85, guides the visual target beam to the eye to be inspected, and optically forms an image of the visual target beam having passed through the correction optical system 60 in front of the eye to be inspected at a predetermined inspection distance. That is, the concave mirror 85 reflects the sighting mark light beam into a substantially parallel light beam. Therefore, the visual target image observed from the subject person appears to be longer than the actual distance from the subject eye E to the display 31. That is, by using the concave mirror 85, the visual target image can be presented to the person to be inspected so that the image of the visual target beam is seen at a position of a predetermined inspection distance.

This will be explained in more detail. In the following description, the left-eye optical path is taken as an example. The right-eye optical path has the same configuration as the left-eye optical path. For example, in the left-eye subjective measurement unit, the sighting target light flux projected from the display 13 of the left-eye measurement unit 7L enters the astigmatism correction optical system 63 via the light projecting lens 33. The sighting target light flux having passed through the astigmatism correcting optical system 63 enters the correcting optical system 90 via the reflecting mirror 36, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14. The sighting target light flux having passed through the correction optical system 90 is projected from the left-eye measurement unit 7L toward the left-eye deflecting mirror 81L. The sighting target light beam emitted from the left-eye measurement unit 7L and reflected by the left-eye deflecting mirror 81 is reflected by the half mirror 84 toward the concave mirror 85. The optotype beam reflected by the concave mirror passes through the half mirror 84 and reaches the left eye EL.

Thus, the optotype image corrected by the correction optical system 60 with the spectacle attachment position of the left eye EL (for example, approximately 12mm from the corneal vertex) as a reference is formed on the fundus oculi of the left eye EL. Therefore, the image aimed at the optotype can be seen by the examiner in a natural state through the concave mirror 85, which is equivalent to the case where the astigmatism correction optical system 63 is disposed in front of the eye as if the adjustment of the spherical power of the correction optical system (in the present embodiment, the drive of the drive mechanism 39) for the spherical power is performed in front of the eye. In the present embodiment, the right-eye optical path has the same configuration as the left-eye optical path, and the optotype images corrected by the pair of right and left correction optical systems 60 based on the spectacle attachment positions (for example, approximately 12mm from the corneal vertex) of the two eyes ER and EL to be inspected are formed on the bottoms of the two eyes. In this way, the examinee looks directly at the optotype in a natural visual state and responds to the examinee, the correction of the correction optical system 60 is realized until the examination optotype is properly observed, and the optical characteristics of the eye to be examined are subjectively measured based on the correction value.

Next, the optical path of the objective measurement unit will be described. In the following description, the left-eye optical path is taken as an example. The right-eye optical path has the same configuration as the left-eye optical path. For example, in the objective measurement unit for the left eye, measurement light emitted from the light source 11 of the projection optical system 10a in the objective measurement optical system 10 enters the correction optical system 90 through the relay lens 12 to the objective lens 14. The measurement light having passed through the correction optical system 90 is projected from the left-eye measurement unit 7L toward the left-eye deflecting mirror 81L. The measurement light emitted from the left-eye measurement unit 7L and reflected by the left-eye deflecting mirror 81 is reflected by the half mirror 84 toward the concave mirror 85. The measurement light reflected by the concave mirror transmits through the half mirror 84 to reach the left eye EL, and a point-like point light source image is formed on the fundus of the left eye EL. At this time, the pupil projection image (projection light beam on the pupil) of the aperture mirror 13 is eccentrically rotated at high speed by the prism 15 rotating around the optical axis.

The light of the point light source image formed on the fundus of the left eye EL is reflected and scattered to exit the eye E, and is condensed by the objective lens 14 via the optical path through which the measurement light passes, and passes through the dichroic mirror 29, the dichroic mirror 35, the prism 15, the aperture mirror 13, the relay lens 16, and the reflecting mirror 17. The reflected light passing through the mirror 17 is condensed again at the opening of the light receiving diaphragm 18, is formed into a substantially parallel light flux by the collimator lens 19 (in the case of emmetropia), is extracted as an annular light flux by the annular lens 20, and is received as an annular image by the imaging element 22. By analyzing the received annular image, the optical characteristics of the eye to be examined can be objectively measured.

< control section >

For example, the control unit 70 includes a CPU (processor), a RAM, a ROM, and the like. For example, the CPU of the control unit 70 is responsible for controlling each component of the subjective refraction device 1. For example, the RAM temporarily stores various information. Various programs for controlling the operation of the subjective refraction device 1, target data for various examinations, initial values, and the like are stored in the ROM of the control unit 70. In addition, the control section 70 may be constituted by a plurality of control sections (i.e., a plurality of processors).

For example, a nonvolatile memory (storage unit) 72, a monitor (also serving as an operation unit in the present embodiment) 4, various members, and the like are electrically connected to the control unit 70. The nonvolatile memory (hereinafter, referred to as a memory) 72 is a non-transitory storage medium capable of holding a storage content even when power supply is cut off. For example, a hard disk drive, a flash ROM, an OCT device 1, a USB memory detachably attached to the subjective refraction device 1, or the like can be used as the nonvolatile memory 72. For example, a control program for controlling the subjective measurement unit and the objective measurement unit is stored in the memory 72.

< control action >

The control operation of the subjective refraction device 1 will be described below. Fig. 6 is a flowchart illustrating a flow of the control operation in the present embodiment. The examiner instructs the lower jaw of the examinee to contact the lower jaw stage 5 and observes the presentation window 3. The examiner instructs the examinee to stare at the fixation mark displayed on the display 31, and then performs alignment with respect to the eye to be examined.

< alignment action (S1) >

When the alignment start switch is selected by the inspector, the control section 70 starts the automatic alignment (S1). In the present embodiment, a case where the optical characteristics of the eye to be examined for hyperopia are measured will be described as an example. The optical characteristics of the eye to be examined can be measured even in the case of myopia, as in the case of hyperopia.

For example, the control unit 70 detects pupil positions of the left and right eyes from the face image captured by the imaging optical system 100. For example, when the pupil position is detected, the control unit 70 controls the subjective refraction device 1 so that the anterior segment image is displayed on the monitor 4. For example, the control unit 70 drives and rotates the right-eye deflecting mirror 81R and the left-eye deflecting mirror 81L in the XY directions. For example, when the pupil position is detected, the control unit 70 can move the right-eye measurement unit 7R and the left-eye measurement unit 7L in the X direction, respectively. That is, the control unit 70 drives the deflection mirror 81 to perform the XY-direction alignment, and drives the measurement unit 7 to perform the Z-direction alignment.

In the present embodiment, the configuration in which the XYZ-direction alignment is adjusted by driving the deflection mirror 81 and the measurement unit 7 is described as an example, but the present invention is not limited to this. The present invention may be applied to any configuration capable of adjusting the positional relationship between the eye to be examined and the subjective measurement unit and the objective measurement unit. That is, any configuration may be adopted as long as it is possible to adjust the XYZ directions so that the image corrected by the correction optical system 60 is formed on the fundus oculi of the eye to be examined. For example, the subjective refraction device 1 may be moved by providing a structure that enables the subjective refraction device 1 to move in the XYZ-direction relative to the lower jaw 6. For example, as a configuration in which the deflection mirror 81 and the measurement unit can be moved integrally in the XYZ direction, a configuration in which adjustment in the XYZ direction is performed may be employed. For example, the adjustment in the XYZ direction may be performed only by the deflection mirror 81. In this case, for example, the deflection mirror 81 is rotationally driven, and the deflection mirror 81 is moved in the Z direction so as to change the distance from the measurement unit. In the alignment control, for example, the two eyes to be inspected may be displayed on the monitor 4, and the alignment control of the two eyes to be inspected may be performed on the same screen. For example, in the alignment control, one eye to be examined may be displayed on the monitor 4, and after the alignment control of one eye to be examined is completed, the other eye to be examined may be displayed on the monitor 4, and the alignment control of the other eye to be examined may be performed. For example, it is possible to perform alignment control of one eye to be inspected based on the result of alignment control of the other eye to be inspected.

For example, the control unit 70 detects a positional shift of the image of the correction optical system 60 with respect to the eye to be inspected. For example, the control section 70 controls the drive unit based on the detected detection result so that the apparent light beam for guiding the image of the correction optical system 60 to the eye to be inspected is deflected, thereby optically correcting the formation position of the image. In this way, the subjective refraction device 1 of the present embodiment is configured to detect a positional deviation between the eye to be examined and the correction optical system and optically correct the formation position of the image. Thus, by correcting the positional deviation between the eye to be examined and the correction optical system, the apparatus can be used at an appropriate position, and measurement can be performed with high accuracy.

< Objective measurement (S2) >

The control unit 70 generates an objective measurement start trigger signal (hereinafter referred to as a trigger signal) for starting objective measurement (objective measurement) (S2) based on the output of the alignment completion signal. When a trigger signal for starting objective measurement is generated, the control unit 70 emits a measurement light beam from the objective measurement optical system 10. In this case, each measurement beam is reflected by the concave mirror 85 via the deflection mirrors 81R and 81L, and then projected onto the fundus of the eye to be examined. The measurement light reflected from the fundus is reflected by the deflection mirror 81R (81L) via the concave mirror 85, and then the measurement image is captured by the imaging element 22.

For example, in measuring the objective eye refractive power, preliminary measurement of the eye refractive power may be performed first, and the eye E may be fogged by moving the display 31 in the direction of the optical axis L2 based on the result of the preliminary measurement. That is, the display 31 can be temporarily moved to a focused position with respect to the eye E to be inspected. Then, the eye refractive power can be measured formally for the eye to be examined for fogging. In the main measurement, a measurement image is captured by the imaging device 22, and an output signal from the imaging device 22 is stored in the memory 72 as image data (measurement image). Then, the control section 70 performs image analysis on the ring-shaped image stored in the memory 72 to obtain the values of the refractive powers in the respective meridian directions. The control section 70 obtains objective eye power (objective value) of S (spherical power), C (astigmatic power), and a (astigmatic axis angle) of the eye to be inspected in the case of hyperopia by performing predetermined processing on the power. The obtained objective value for the far vision is stored in the memory 72.

In the measurement of the objective eye refractive power, the control unit 70 may control the correction optical system 90 to correct optical aberration occurring in the optical path of the objective measurement optical system 10. In this case, a correction amount corresponding to the dioptric power measured by the objective measurement optical system 10 is acquired from the memory 72, and the correction optical system 90 is controlled based on the acquired aberration correction amount.

More specifically, a correction amount is set according to the eye refractive power obtained in the preliminary measurement, and the correction optical system 90 is driven based on the set correction amount. Accordingly, as for the actual measurement, the actual measurement is performed in a state where the aberration generated in the optical path of the objective measurement optical system 10 is corrected, and therefore the objective eye refractive power can be measured with high accuracy. When the eye refractive power is continuously measured (for example, a plurality of actual measurements are performed), the correction optical system 90 may be controlled based on each measurement result.

In the above description, the objective eye power for the distance vision is measured, but the present invention is not limited to this, and the objective eye power for the near vision, which is the eye power in a state where the optotype is present at the distance for the near vision, may be measured. The objective eye refractive power measurement may be performed simultaneously for the left and right eyes, or may be performed at different timings for the left and right eyes.

< subjective measurement (S3) >

Next, subjective measurement is performed (S3). When the monitor (also serving as the operation unit in the present embodiment) 4 is operated after the objective power measurement is completed, the mode is switched to the subjective distance vision measurement mode (subjective power measurement mode).

For example, the control section 70 may control the display 31 to display a desired visual acuity value optotype (e.g., an optotype of a visual acuity value of 0.8) on the optical axis L2. After the initial presentation optotype is presented to the eye to be examined, the examiner performs vision measurement for hyperopia of the examinee. When a predetermined switch of the monitor 4 is pressed, the presented visual acuity chart is switched.

For example, when the answer of the examinee is a correct answer, the examiner switches to a visual target with a higher visual acuity value. On the other hand, when the answer of the person to be inspected is a wrong answer, the answer is switched to the optotype of the visual force value one level lower. That is, the control unit 70 may switch the optotype based on the signal for changing the visual force value from the monitor 4.

The examiner can use the monitor 4 to change the correction power of the correction optical system 60 and obtain the subjective values (spherical power S, astigmatic power C, astigmatic axis angle a) for hyperopia of the eye to be examined.

The correction power of the correction optical system 60 may be set to different powers for the left and right eyes, or may be set to the same power for the left and right eyes. The subjective eye refractive power measurement may be performed simultaneously for the left and right eyes, or may be performed at different timings for the left and right eyes. At different timings, the optotype may not be displayed on the display 31 of the non-measuring eye, or the optical correction system 60 may be used to make the eye fogged (for example, to add a certain dioptric power to the objective value).

After the subjective value for the far vision is obtained, the mode can be switched to the subjective near vision measurement mode. When the measurement mode for near vision is set, the control unit 70 may control the projection optical system 30 to change the convergence angle by the deflecting mirror 81, thereby presenting the optotype at the near vision position. The presentation distance of the optotype in the test for myopia may be arbitrarily changed based on the operation signal from the operation unit 4. As a result, the visual target presentation distance is changed from the far vision position to the near vision position. In the test for near vision, the addition power and the adjustment power can be subjectively obtained by changing the presentation distance of the optotype at the near vision position.

In this case, for example, the control unit 70 may acquire an aberration correction amount corresponding to the presentation distance of the optotype from the memory 72, and control the correction optical system 90 based on the acquired aberration correction amount. When the presentation distance of the optotype is changed, the control unit 70 may change the aberration correction amount of the correction optical system 90 according to the changed optotype presentation distance. Thus, even when the visual target presenting distance is changed, the visual target with reduced aberration can be presented. In this case, the control unit 70 may change the aberration correction amount according to the correction power of the presentation distance to which the optotype is added.

Further, the control unit 70 may control the light deflecting member to change the convergence angle of the left and right sighting target light fluxes in accordance with the change of the presentation position of the sighting target. In this case, for example, the control unit 70 may acquire an aberration correction amount corresponding to the deflection angle of the optical deflection member corresponding to the convergence angle from the memory 72, and control the correction optical system 90 based on the acquired aberration correction amount. When the convergence angle of the sighting mark light beam is changed, the control part 70 may change the aberration correction amount of the correction optical system 90 according to the changed convergence angle. Thus, even when the convergence angle is changed, an optotype in which aberration is reduced can be presented.

In the case of the near vision examination, for example, the examiner can measure the subjective eye refractive power (subjective value for near vision) in a state in which the near vision optotype is present by changing the correction power of the correction optical system 60 using a predetermined switch of the operation unit 4, as in the case of the far vision examination. In the case of the myopia test, the control unit 70 may change the aberration correction amount of the correction optical system 90 in accordance with the change in the correction power.

< acquisition of Condition information (S5) >

In this embodiment, the subjective refraction device 1 is configured to perform objective measurement while subjective measurement is performed to capture a change in optical characteristics of the eye to be examined. For example, in the present embodiment, the adjustment information is acquired based on the optical characteristics of the eye to be examined measured by the objective measurement unit while the subjective measurement is being performed. For example, the adjustment information may be used to capture a change in optical characteristics of the eye to be examined during the time when subjective measurement is performed.

The following describes acquisition of adjustment information (S5). For example, in the present embodiment, while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit (S3), the control unit 70 objectively measures the optical characteristics of the eye to be inspected by the objective measurement unit.

More specifically, for example, in the present embodiment, the control unit 70 objectively measures the optical characteristic of the eye to be inspected by the objective measurement unit to obtain the first optical characteristic. For example, while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit, the control unit 70 objectively measures the optical characteristics of the eye to be inspected by the objective measurement unit to obtain the second optical characteristics. The optical characteristics measured by the objective measurement unit may be stored in the memory 72.

For example, in the present embodiment, the first optical characteristic is obtained by objectively measuring the optical characteristic of the eye to be inspected by the objective measurement unit before subjectively measuring the optical characteristic of the eye to be inspected by the subjective measurement unit. For example, in the present embodiment, the optical characteristics obtained by objective measurement (S2) performed before the subjective measurement are used as the first optical characteristics (e.g., spherical power, astigmatic axis angle). Of course, the first optical characteristic may be obtained by an objective measurement unit before the optical characteristic of the eye to be inspected is subjectively measured by a subjective measurement unit.

For example, the control unit 70 may measure the second optical characteristic when a predetermined time has elapsed after the start of the subjective measurement (for example, after 1 minute from the start of the subjective measurement). The configuration is not limited to the configuration in which the second optical characteristic is acquired when the time set as the timing of acquiring the second optical characteristic has elapsed. The second optical characteristic can be obtained by various configurations of triggering. For example, the timing of acquiring the second optical characteristic may be at least one of a main observation timing (for example, a state in which projection of the target beam is started, a state in which an inspection program is started, a state in which operation of an operation unit of the subjective inspection apparatus is started, a state in which driving of the correction optical system is started, and the like), a switching of the inspection targets, and a time between subjective inspections (when a plurality of subjective inspections are performed). Of course, a trigger signal for starting objective measurement may be output at a timing other than the above description.

Further, the plurality of optical characteristics may be acquired while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit. In this case, for example, the control unit 70 may acquire the second optical characteristic when a predetermined time has elapsed after the start of the subjective measurement, and then acquire the optical characteristic (for example, the third optical characteristic, the fourth optical characteristic, or the like) each time the predetermined time has elapsed.

For example, the control unit 70 acquires adjustment information based on the first optical characteristic and the second optical characteristic. For example, in the present embodiment, the control section 70 obtains the adjustment information by performing difference processing on the first optical characteristic and the second optical characteristic. In the following description, a case where spherical power of eye refractive power is used as the first optical characteristic and the second optical characteristic will be described as an example. In the present embodiment, the spherical power in the eye refractive power is described as the first optical characteristic and the second optical characteristic, but the present invention is not limited to this. For example, the first optical characteristic and the second optical characteristic are not limited to the eye refractive power. For example, as the eye refractive power, at least one of spherical power, astigmatic power, and astigmatic axis angle may be used.

More specifically, in the present embodiment, for example, the control section 70 acquires the adjustment information based on a difference between a first eye refractive power acquired before the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement means and a second eye refractive power acquired while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement means. For example, when the spherical power of the first eye refractive power is 1.0 diopter (D) and the spherical power of the second eye refractive power is 3.0D, the control section 70 performs difference processing to acquire the spherical power 2.0D as the adjustment information.

In this case, for example, the control unit 70 may correct the measurement result obtained by objectively measuring the eye to be inspected by the objective measurement unit based on the correction information of the correction optical system. For example, in the case where the subjective refraction device is configured such that the measurement light beam of the objective measurement unit passes through the correction optical system of the subjective measurement unit, the correction state of the correction optical system 60 (arrangement state of the optical members) when the first optical characteristic is obtained may be different from the correction state of the correction optical system 60 when the second optical characteristic is obtained. Therefore, when the first optical characteristic and the second optical characteristic are compared without considering the correction state of the correction optical system, it is difficult to obtain a highly accurate result as the adjustment information.

In the following description, a case where the first optical characteristic and the second optical characteristic are corrected based on correction information of the correction optical system is described as an example. In the present embodiment, a configuration in which the first optical characteristic and the second optical characteristic are corrected based on the correction information is taken as an example for description, but the present invention is not limited to this. For example, the adjustment information may also be corrected based on the correction information.

For example, in the present embodiment, the control section 70 corrects the first optical characteristic and the second optical characteristic based on correction information of the correction optical system. For example, the control unit 70 acquires correction information for correction. For example, the control unit 70 retrieves, from the memory 72, correction information (for example, spherical power, cylindrical power, and cylindrical axis) of the correction optical system when the first optical characteristic is acquired. Then, for example, the control unit 70 calls correction information (for example, spherical power, cylindrical axis) of the correction optical system when the second optical characteristic is acquired. The control unit 70 may store correction information of the correction optical system in the memory 72 in association with each optical characteristic when the correction information of the correction optical system is acquired.

For example, the control unit 70 retrieves, from the memory 72, first correction information when the first optical characteristic is acquired and second correction information when the second optical characteristic is acquired. For example, the control section 70 may correct the first optical characteristic based on the first correction information and correct the second optical characteristic based on the second correction information. For example, when the spherical power of the first correction information is 1.0D, the spherical power of the second correction information is 4.0D, the spherical power of the first optical characteristic is 1.0D, and the spherical power of the second optical characteristic is 5.0D, the spherical power of the first optical characteristic when there is no influence of the correction optical system is 0D, and the spherical power of the second optical characteristic when there is no influence of the correction optical system is 1.0D. Accordingly, when the difference between the spherical powers of the first optical characteristic and the second optical characteristic is processed without the influence of the correction optical system, it is 1.0D as the adjustment information. That is, it was found that a change in spherical power of 1.0D occurred during the period in which the subjective measurement was performed. In the above configuration, the correction information is described by taking the spherical power as an example, but the correction information is not limited to this. For example, as the correction information, at least one of spherical power, astigmatic power, and astigmatic axis angle may be used.

Further, when the correction optical system is not driven (not corrected) when the first optical characteristic is acquired and the correction optical system is driven (corrected) only when the second optical characteristic is acquired, the second correction information is used to correct only the second optical characteristic, thereby acquiring the adjustment information in consideration of the correction optical system. Of course, when the correction optical system is not driven (not corrected) when the second optical characteristic is acquired, and the correction optical system is driven (corrected) only when the first optical characteristic is acquired, only the first optical characteristic is corrected by the first correction information, whereby the adjustment information in consideration of the correction optical system can be acquired.

In the present embodiment, the case where the first optical characteristic and the second optical characteristic are corrected based on the correction information is described as an example, but the present invention is not limited to this. For example, the adjustment information may also be corrected based on the correction information. In this case, for example, the control unit 70 performs difference processing on the first correction information and the second correction information to obtain correction information for correction. For example, when the spherical power of the first correction information is 1.0D, the spherical power of the second correction information is 4.0D, the spherical power of the first optical characteristic is 1.0D, and the spherical power of the second optical characteristic is 5.0D, the correction information acquired for correction is 3.0D based on the difference between the first correction information and the second correction information. Also, for example, the adjustment information is 4.0D according to the difference between the first optical characteristic and the second optical characteristic. Therefore, by correcting the adjustment information using the correction information, the adjustment information in consideration of the influence of the correction optical system is 1.0D.

As described above, by correcting the measurement result obtained by objectively measuring the eye to be inspected based on the correction information, it is possible to correct the variation in optical characteristics caused by the measurement light beam for objective measurement passing through the correction optical system. Thus, even when objective measurement is performed during correction by the correction optical system, optical characteristics can be obtained with high accuracy. For example, in particular, when acquiring adjustment information based on at least two optical characteristics acquired by objective measurement, the present technique is more effective because a difference occurs between the optical characteristics and comparison is difficult.

< correction processing based on adjustment information (S6) >

For example, when the adjustment information is acquired, the control section 70 outputs the adjustment information. In the present embodiment, for example, the control section 70 transmits the adjustment information to a setting unit that sets a correction amount for correcting the change in the adjustment state. In the present embodiment, the control unit 70 also serves as setting means. Of course, as a configuration different from the control unit 70, a configuration in which a setting means (setting control means) is separately provided may be adopted. In the present embodiment, the configuration of outputting the adjustment information is described by taking as an example the configuration of transmitting the adjustment information to the setting means, but the present invention is not limited to this. For example, the adjustment information may be displayed on the monitor 4. Further, for example, the adjustment information may be printed. In this case, the inspector can confirm the adjustment state by confirming the monitor 4 or the printed matter.

For example, in the present embodiment, the control unit 70 sets a correction amount for correcting a change in the adjustment state of the eye to be inspected, which occurs while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit, based on the adjustment information. For example, the control unit 70 controls the correction optical system 60 to perform correction for canceling out the change in the adjustment state of the eye to be examined, which is caused in the subjective measurement unit, based on the set correction amount (S6). The configuration for performing correction for canceling out the change in the adjustment state of the eye to be examined, which is caused by the subjective measurement unit, is not limited to the correction optical system 60. A different correction optical system may be separately provided.

For example, the control section 70 sets the correction amount based on the acquired adjustment state. For example, the control unit 70 controls the correction optical system. For example, the correction amount may be made into a table set in advance for each parameter of the adjustment information, and the made table may be stored in a memory (e.g., the memory 72). In this case, for example, the control section 70 may call up the correction amount corresponding to the adjustment state from the memory 72 and set it. For example, the memory 72 may store a calculation expression for deriving the correction amount for each parameter of the adjustment information, and the correction amount may be obtained using the calculation expression.

For example, the control unit 70 corrects the correction state of the correction optical system at the main observation timing. For example, the control section 70 performs correction of the additional correction amount. For example, when the spherical power of the correction optical system in the subjective measurement is 2.0D and the spherical power of the adjustment information is 1.0D, the correction amount is set to 1.0D. For example, the control unit 70 corrects the spherical power of the correction optical system 60 by the correction amount 1.0D. That is, the control unit 70 controls the correction optical system 60 to perform correction so that the spherical power of the correction optical system becomes 1.0D.

In the present embodiment, a configuration in which correction for canceling out the change in the adjustment state of the eye to be examined is performed based on the adjustment information is described as an example, but the present invention is not limited to this. For example, it is also possible to determine whether the adjustment information is good or not based on the adjustment information and display the determination result on the monitor 4 or the printed matter. In this case, the examiner can confirm the determination result and perform processing corresponding to the determination result. For example, the examiner may perform an action for improving the adjustment state.

As described above, for example, in the present embodiment, while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit, the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit, whereby the change in the optical characteristics of the eye to be inspected during the period of the subjective measurement can be confirmed. Thus, the examiner can perform subjective measurement in consideration of the change in the optical characteristics of the eye to be examined during the subjective measurement period. Therefore, when the examiner subjectively measures the optical characteristics of the eye to be inspected, the optical characteristics of the eye to be inspected can be measured with high accuracy.

For example, in the present embodiment, the first optical characteristic is objectively measured and the second optical characteristic is objectively measured while the optical characteristic of the eye to be inspected is subjectively measured. Adjustment information based on the acquired first optical characteristic and second optical characteristic is acquired, and the adjustment information is output. With this configuration, it is possible to easily obtain a change in optical characteristics of the eye to be inspected during subjective measurement based on the adjustment information based on the first optical characteristics and the second optical characteristics of the eye to be inspected. Therefore, the examiner can measure the optical characteristics of the eye to be examined easily and with high accuracy by using the adjustment information when subjectively measuring the optical characteristics of the eye to be examined.

In the present embodiment, for example, before the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit, the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit. In this way, since objective measurement is performed before subjective measurement by the subjective measurement unit, it is possible to obtain the optical characteristics of objective measurement while suppressing the change in optical characteristics caused by using the subjective measurement unit. Therefore, it is possible to obtain optical characteristics measured by an objective formula with changes in the optical characteristics suppressed, and to obtain more favorable adjustment information.

In addition, for example, in the present embodiment, by obtaining the adjustment information through the comparison processing, it is possible to more easily obtain the change in the optical characteristics of the eye to be inspected during the subjective measurement period based on the adjustment information after the comparison processing. Therefore, the examiner can measure the optical characteristics of the eye to be examined more easily and with high accuracy by using the adjustment information when subjectively measuring the optical characteristics of the eye to be examined.

For example, in the present embodiment, a correction amount for correcting the change in the adjustment state of the eye to be examined is set based on the adjustment information, and correction for canceling the change in the adjustment state of the eye to be examined, which is generated in the subjective expression measuring means, is performed based on the correction amount. Thus, even when the optical characteristics of the eye to be inspected change during the subjective measurement by the subjective measurement means, the measurement can be performed in a state in which the change in the optical characteristics is cancelled out. Thus, when the optical characteristics of the eye to be inspected are subjectively measured, the optical characteristics of the eye to be inspected can be easily and accurately measured.

< initial value setting >

For example, in the present embodiment, the subjective refraction device 1 may perform objective measurement after the subjective measurement of the optical characteristics of the eye to be inspected is started by the subjective measurement unit, and set the obtained measurement result as the initial value of the correction optical system 60 when the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit.

Fig. 7 is a flowchart illustrating a flow of the control operation for initial value setting according to the present embodiment. The initial value setting is explained below. For example, the control unit 70 starts subjective measurement (S11). For example, when the examiner operates the monitor (also serving as the operation unit in the present embodiment) 4, the control unit 70 controls the display 31 to display a desired optotype of visual acuity value on the optical axis L2, for example.

For example, after the subjective measurement of the optical characteristics of the eye to be inspected is started by the subjective measurement unit, the control unit 70 objectively measures the optical characteristics of the eye to be inspected by the objective measurement unit to obtain the optical characteristics of the eye to be inspected (S12). For example, in the present embodiment, after the initial presentation optotype is presented on the display 31, the control unit 70 objectively measures the optical characteristics of the eye to be inspected by the objective measurement unit to obtain the optical characteristics of the eye to be inspected. That is, in the present embodiment, as the timing at which the subjective measurement starts, the timing at which the initial presentation optotype is presented is used. Of course, the timing at which the subjective measurement starts is not limited to the timing at which the initial presentation optotype is presented.

For example, the timing of starting the subjective measurement may be a state in which the control of the subjective measurement is started. For example, the timing at which the subjective measurement is started may be at least one of the timing at which the inspection program is started, the timing at which the monitor (also serving as the operation unit in the present embodiment) 4 of the subjective inspection apparatus 1 is started, the timing at which the correction optical system 60 is driven, and the like.

For example, the control unit 70 sets the objectively measured optical characteristics of the eye to be inspected to the initial values of the correction optical system 60 when the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit (S13). For example, in the present embodiment, the optical characteristics used for setting the initial values are described by taking the eye refractive power (for example, spherical power, astigmatic power, and astigmatic axis angle) as an example. In the present embodiment, the optical characteristics used for setting the initial values are described by taking the eye refractive power as an example, but the optical characteristics are not limited to this. For example, as the optical characteristics for initial value setting, different optical characteristics may be used. For example, as the eye refractive power used for initial value setting, at least one of spherical power, astigmatic power, and astigmatic axis angle may be used.

For example, in the present embodiment, the control unit 70 sets the optical characteristics of the eye to be inspected, which are objectively measured by the objective measurement unit, to the initial values of the correction optical system in the subjective measurement (S11) of the optical characteristics of the eye to be inspected, which is performed by the subjective measurement unit before the start of the objective measurement by the objective measurement unit. In addition, the subjective measurement may be continuously performed while the optical characteristics of the eye to be inspected are acquired by the objective measurement unit. The subjective measurement may be temporarily stopped while the optical characteristics of the eye to be examined are acquired by the objective measurement unit. In this case, an initial value may be set, and the control unit 70 may start subjective measurement again. In this case, after the initial value is set, the examiner may select a switch for starting the subjective measurement to restart the subjective measurement.

For example, the control section 70 acquires the eye refractive power of the eye to be examined by the objective measurement unit. For example, when the eye refractive power of the eye to be inspected is acquired, the control unit 70 drives the correction optical system 60 based on the eye refractive power and sets the initial value of the subjective examination. For example, the correction optical system 60 is controlled by the objective measurement unit so as to correct the refractive error of the eye to be examined based on the eye refractive power of the eye to be examined.

For example, when the correction optical system 60 is controlled to complete the setting of the initial value, the examiner changes the correction power of the correction optical system 60 using the monitor 4 from the state where the setting of the initial value is completed, and obtains the subjective optical characteristics of the eye to be examined (S15). That is, subjective measurement is performed from a state in which the setting of the initial value is completed.

For example, in the present embodiment, after the subjective measurement of the optical characteristics of the eye to be inspected is started by the subjective measurement unit, the optical characteristics of the eye to be inspected are objectively measured by the objective measurement unit, and the optical characteristics of the eye to be inspected are acquired. The objectively measured optical characteristics of the eye to be inspected are set as initial values of the correction optical system when the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit. With this configuration, it is possible to quickly measure the optical characteristics of the eye to be examined without waiting until objective measurement is completed and performing subjective measurement by the subjective examination apparatus.

In the present embodiment, for example, the optical characteristics of the eye to be inspected, which are objectively measured by the objective measurement unit, are set as the initial values of the correction optical system in the subjective measurement of the optical characteristics of the eye to be inspected, which is performed by the subjective measurement unit before the objective measurement by the objective measurement unit is started. With this configuration, it is possible to quickly perform subjective measurement by the subjective inspection apparatus.

In the present embodiment, the configuration in which the optical characteristics of the eye to be inspected that is objectively measured are set as the initial values of the correction optical system in the subjective measurement of the optical characteristics of the eye to be inspected that is performed by the subjective measurement unit before the objective measurement by the objective measurement unit is started is described as an example, but the present invention is not limited to this. For example, the control unit 70 performs a first subjective measurement of subjectively measuring the optical characteristics of the eye to be inspected by the subjective measurement unit, and then performs a second subjective measurement of subjectively measuring the optical characteristics of the eye to be inspected by the subjective measurement unit again. After the first subjective measurement is started, the control unit 70 objectively measures the optical characteristics of the eye to be examined by the objective measurement unit. The control unit 70 sets the optical characteristics of the eye to be examined objectively measured by the objective measurement unit as the initial value of the second subjective measurement. For example, the first subjective measurement is a measurement for obtaining an optical characteristic different from the optical characteristic obtained by the second subjective measurement. In this case, for example, the first subjective measurement may be a subjective measurement of subjectively measuring the optical characteristics of the eye to be inspected in a non-corrected state in which the optical characteristics of the sighting mark light beam are not changed by the correction optical system. That is, the first subjective determination may be a naked eye examination. For example, the second subjective measurement may be a subjective measurement that subjectively measures the optical characteristics of the eye to be inspected by changing the optical characteristics of the sighting mark light beam by the correction optical system.

For example, in the present embodiment, after the first subjective measurement for subjectively measuring the optical characteristics of the eye to be inspected is performed by the subjective measurement unit, the second subjective measurement for subjectively measuring the optical characteristics of the eye to be inspected is performed again by the subjective measurement unit. After the first subjective measurement is started, the optical characteristics of the eye to be examined are objectively measured by the objective measurement unit, and the objectively measured optical characteristics of the eye to be examined are set as initial values of the second subjective measurement. With this configuration, even when subjective measurement is performed again, since the initial value is already obtained at the time of different subjective measurements, the measurement can be performed quickly.

Claims

1. A subjective refraction device for subjectively measuring an optical characteristic of an eye to be examined, comprising:

a subjective measurement unit which has a projection optical system that projects a target light beam to an eye to be inspected and a correction optical system that is located in an optical path of the projection optical system and changes an optical characteristic of the target light beam, and which subjectively measures the optical characteristic of the eye to be inspected;

an objective measurement unit having a measurement optical system that emits measurement light to a fundus of an eye to be examined and receives reflected light of the measurement light, and objectively measuring an eye refractive power of the eye to be examined; and

a control unit for objectively measuring the eye refractive power of the eye to be examined by the objective measurement unit while the optical characteristics of the eye to be examined are subjectively measured by the subjective measurement unit,

the control unit obtains a first eye refractive power by objectively measuring an eye refractive power of the eye to be examined by the objective measurement unit before subjectively measuring the optical characteristic of the eye to be examined by the subjective measurement unit, and obtains a second eye refractive power by objectively measuring the eye refractive power of the eye to be examined by the objective measurement unit while subjectively measuring the optical characteristic of the eye to be examined by the subjective measurement unit,

the subjective optometry unit further comprises:

an acquisition unit configured to acquire, based on the first eye refractive power and the second eye refractive power, adjustment information indicating a change in eye refractive power of the eye to be examined during a period of subjective measurement; and

and an output unit that outputs the adjustment information.

2. Subjective refraction apparatus according to claim 1,

the acquisition unit acquires the adjustment information by performing difference processing on the first eye refractive power and the second eye refractive power.

3. Subjective refraction apparatus according to claim 1,

the subjective optometry device comprises:

a setting unit that sets, based on the adjustment information, a correction amount for correcting a change in the adjustment state of the eye to be inspected that occurs while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit; and

and a first correction unit that performs correction for canceling out the change in the adjustment state of the eye to be examined generated in the subjective measurement unit, based on the correction amount set by the setting unit.

4. Subjective refraction apparatus according to claim 1,

the objective measurement unit has a right-eye measurement optical system and a left-eye measurement optical system provided as a pair on the left and right sides.

5. Subjective refraction apparatus according to claim 1,

the control unit obtains an eye refractive power of the eye to be examined by objectively measuring an eye refractive power of the eye to be examined by the objective measurement unit after the subjective measurement of the optical characteristic of the eye to be examined is started by the subjective measurement unit,

the subjective refraction device includes an initial value setting unit that sets the eye refractive power of the eye to be examined, which is objectively measured by the control unit, to an initial value of the correction optical system when the optical characteristics of the eye to be examined are subjectively measured by the subjective measurement unit.

6. Subjective refraction apparatus according to claim 1,

the correction optical system is disposed in an optical path of the measurement optical system,

the subjective refraction device includes a second correction unit that corrects a measurement result obtained by objectively measuring the eye to be inspected by the objective measurement unit based on correction information of the correction optical system.

7. Subjective refraction apparatus according to claim 1,

the control unit obtains the first eye refractive power by objectively measuring the eye refractive power of the eye to be examined by the objective measurement unit before subjectively measuring the optical characteristics of the eye to be examined by the subjective measurement unit, obtains the second eye refractive power in real time by objectively and continuously measuring the eye refractive power of the eye to be examined by the objective measurement unit while subjectively measuring the optical characteristics of the eye to be examined by the subjective measurement unit,

the acquisition unit continuously acquires the adjustment information based on the first eye refractive power and the second eye refractive power,

the output section outputs the adjustment information in real time.

8. A storage medium storing a subjective refraction program used in a subjective refraction device for subjectively measuring an optical characteristic of an eye to be inspected, the subjective refraction device including a subjective measurement unit and an objective measurement unit, the subjective measurement unit including a projection optical system for projecting a target light beam to the eye to be inspected and a correction optical system which is located in an optical path of the projection optical system and changes the optical characteristic of the target light beam, the objective measurement unit including a measurement optical system for emitting measurement light to a fundus oculi of the eye to be inspected and receiving reflected light of the measurement light, and the storage medium being characterized in that the objective refractive power of the eye to be inspected is objectively measured,

the processor of the subjective refraction device executes the subjective refraction program to cause the subjective refraction device to execute the following control steps:

objectively measuring an eye refractive power of the eye to be examined by the objective measuring section while the optical characteristics of the eye to be examined are subjectively measured by the subjective measuring section,

in the control step, before the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit, a first eye refractive power is obtained by objectively measuring an eye refractive power of the eye to be inspected by the objective measurement unit, and a second eye refractive power is obtained by objectively measuring an eye refractive power of the eye to be inspected by the objective measurement unit while the optical characteristics of the eye to be inspected are subjectively measured by the subjective measurement unit,

by executing the subjective refraction program by the processor, the subjective refraction device is further caused to perform the following steps:

an acquisition step of acquiring, based on the first eye refractive power and the second eye refractive power, adjustment information indicating a change in eye refractive power of the eye to be examined during subjective measurement; and

and an output step of outputting the adjustment information.