WO2016129499A1

WO2016129499A1 - Ocular refractivity measuring device

Info

Publication number: WO2016129499A1
Application number: PCT/JP2016/053387
Authority: WO
Inventors: 尋久寺部; 良二柴田
Original assignee: 株式会社ニデック
Priority date: 2015-02-09
Filing date: 2016-02-04
Publication date: 2016-08-18
Also published as: JPWO2016129499A1; JP6680216B2

Abstract

Provided is an ocular refractivity measuring device which measures the ocular refractivity of an eye under test and which comprises the following: an examination window for a testee to peer into; a measurement optical system for objectively measuring the ocular refractivity of the eye under test through the examination window; a fixation target presentation optical system for presenting a fixation target to the eye under test through the examination window; a presentation position changing means for changing, in the optical axis direction, the presentation position of the fixation target presented to the eye under test; a relative position detection means for detecting the relative position of the measurement optical system relative to the eye under test; and a drive control means for causing the measurement optical system to move relative to the eye under test on the basis of the detection results from the relative position detection means, and thereby causing auto-alignment to be actuated. The ocular refractivity measuring device is provided with an eye detection means for detecting a reflection from the eye under test, and a control means for initiating the actuation of the auto-alignment by the drive control means, with the detection signal from the eye detection means serving as a trigger therefor.

Description

Eye refractive power measuring device

The present disclosure relates to an eye refractive power measuring apparatus that objectively measures the eye refractive power of a subject's eye.

For example, Patent Document 1 is known as an attempt to reduce the labor of an examiner in an eye refractive power measuring apparatus that objectively measures the eye refractive power of an eye to be examined. Patent Document 1 starts an alignment operation for an eye to be examined using a detection signal from a touch sensor provided on a chin rest as a trigger. In Patent Document 1, a camera capable of photographing with both eyes is used in measuring the interpupillary distance of the eye to be examined.

JP 2006-280612 A

However, in the case of the configuration of Patent Document 1, it is necessary to provide a touch sensor. Further, a camera capable of photographing with both eyes is always required for measuring the distance between pupils.

The present invention has as a technical problem to provide an eye refractive power measuring device whose technical problem is to solve at least one problem of the prior art.

In order to solve the above problems, the present disclosure is characterized by having the following configuration.

(1) An examination window for the examinee to peek, a measurement optical system that objectively measures the eye refractive power of the subject's eye through the examination window, and a fixation with respect to the subject's eye through the examination window A fixation target presenting optical system for presenting the optotype, a presenting position changing means for changing the presenting position of the fixed target presented to the eye to be examined in the optical axis direction, and a relative position of the measurement optical system with respect to the eye to be examined. A relative position detecting means for detecting, and a drive control means for operating automatic alignment by moving the measurement optical system with respect to the eye to be examined based on a detection result from the relative position detecting means. An eye refractive power measuring apparatus for measuring refractive power, which starts an automatic alignment operation by an eye detection means for detecting reflection from an eye to be examined and a detection signal from the eye detection means as a trigger. Control means An eye refractive power measuring device.
(2) An examination window for the examinee to peep, a measurement optical system that objectively measures the eye refractive power of the eye to be examined through the examination window, and the measurement optical system is moved with respect to the eye to be examined An eye refractive power measuring device for measuring the eye refractive power of an eye to be examined, which is arranged at a position different from the examination window and images the other eye different from the measurement eye by the measurement optical system A pupil that measures the interpupillary distance of the subject's eye based on the imaging means that performs the detection, the position detection means that detects the position of the measurement optics, the imaging result from the imaging means, and the detection result from the position detection means An eye refractive power measuring device comprising an inter-distance measuring means.

According to the present disclosure, at least one problem of the prior art can be solved.

It is a figure which shows an example of the external appearance of the apparatus which concerns on this embodiment. It is a figure which shows an example of the optical system and control system which concern on this embodiment. It is a flowchart which shows an example of operation | movement of the apparatus which concerns on this embodiment. FIG. 6 is an explanatory diagram showing an example when measuring the interpupillary distance with the apparatus according to the present embodiment.

An example of an embodiment of the present disclosure will be described based on the drawings.

FIG. 1 is a diagram showing an example of the appearance of an apparatus according to this embodiment. An eye refractive power measurement device (hereinafter, device) 1 includes at least an inspection window 2 and a measurement unit 3. The examination window 2 is a window through which the subject's measurement eye can look into, and is provided at a position (for example, the subject-side casing) fixed to the casing of the apparatus 1, for example.

The measurement unit 3 is provided inside the apparatus 1 and incorporates a measurement optical system 10. The drive unit 6 is provided to move the measurement unit 3 with respect to the eye to be examined. The drive unit 6 includes an actuator (for example, a motor) in order to move the measurement unit 3. For example, the drive unit 6 may move the measurement unit 3 three-dimensionally with respect to the eye to be examined. In this case, the drive unit 6 moves the measurement unit 3 in the left-right direction (X direction), the front-rear direction (Z direction), and the up-down direction (Y direction). When the inspection window 2 is fixed to the apparatus housing, the drive unit 6 moves the measurement unit 3 relative to the inspection window 2.

In addition to the inspection window 2, the other-eye imaging optical system 200 may be provided on the subject-side casing surface of the apparatus 1. The other-eye imaging optical system 200 is provided for imaging another eye different from the measurement eye measured by the measurement optical system 10. The other-eye imaging optical system 200 is disposed at a position different from the inspection window 2. The other-eye imaging optical system 200 may include an imaging element 202.

A forehead 4 may be provided on the subject-side casing surface of the apparatus 1. The forehead 4 is provided, for example, to stabilize the subject's face. In the present embodiment, the chin rest is not provided in order to make it easier for the subject to look into the examination window 2, but a chin rest may of course be set.

A display unit 70 may be provided on the subject-side casing surface of the apparatus 1. For example, a measurement result by the measurement optical system 10 is displayed on the display unit 70. In this case, the display unit (display screen) 70 may be arranged at the same height as the measurement unit 3. Thereby, the subject can see the display screen of the display unit 70 without moving the height of the face with respect to the measurement position by the measurement optical system 10. The display unit 70 may be a touch panel, and may be used as an operation receiving unit that receives an operation from the subject.

Further, the operation unit 300 may be provided on the subject-side casing surface of the apparatus 1. The operation unit 300 may be used, for example, to confirm whether the measurement result is good or may be used to perform various settings in the measurement.

FIG. 2 is a diagram illustrating an example of an optical system and a control system according to the present embodiment. The measurement unit 3 is provided with at least a measurement optical system 10 and a fixation target presenting optical system 30. Further, the measurement unit 3 includes a ring index projection optical system 45, a working distance index projection optical system 46, and an observation optical system (imaging optical system) 50 as a configuration for performing alignment detection on the eye to be examined. It has been.

The measurement optical system 10 is provided, for example, for objectively measuring the eye refractive power of the eye to be examined through an examination window. The measurement optical system 10 includes a projection optical system (light projecting optical system) 10a and a light receiving optical system 10b. The projection optical system 10a is provided, for example, for projecting a measurement index to the fundus oculi Ef of the subject eye E through the pupil of the subject eye (measuring eye) E. The light receiving optical system 10b is provided, for example, for receiving fundus reflected light from the measurement index projected by the projection optical system 10a. As the optical arrangement of the measurement optical system 10, a known optical system used for an autorefractometer can be used. An example is shown below.

More specifically, the projection optical system 10 a includes a measurement light source 11, a relay lens 12, a hall mirror 13, and an objective lens 14 disposed on the optical axis L 1 of the measurement optical system 10.

The light source 11 is a light source for projecting a spot-shaped measurement target on the fundus oculi Ef through the center of the pupil of the eye E to be examined. The light source 11 is optically conjugate with the fundus oculi Ef of the normal eye.

The hall mirror 13 is provided with an opening through which the light beam from the light source 11 through the relay lens 12 passes. The hall mirror 13 is optically conjugate with the pupil of the eye E.

In the light receiving optical system 10b, the hall mirror 13 of the projection optical system 10a and the objective lens 14 are shared with the projection optical system 10a. The light receiving optical system 10b is disposed on the optical axis L2 in the reflection direction of the relay lens 16, the total reflection mirror 17, and the total reflection mirror 17, which are disposed on the optical axis L2 in the reflection direction of the Hall mirror 13. And a two-dimensional image pickup device 22 (hereinafter referred to as “image pickup device 22”) composed of an area CCD or the like.

The light receiving diaphragm 18 and the image sensor 22 are in an optically conjugate positional relationship with the fundus oculi Ef. The ring lens 20 is an optical element for forming fundus reflection light in a ring shape. The ring lens 20 has a lens portion formed in a ring shape and a light shielding portion in which a region other than the lens portion is coated with a light shielding coating. The ring lens 20 is optically conjugate with the pupil of the eye E. Ring-shaped fundus oculi reflection light (that is, a two-dimensional pattern image) via the ring lens 20 is received by the image sensor 22. The image sensor 22 outputs image information of the received two-dimensional pattern image to the arithmetic control unit 100 (hereinafter referred to as the control unit 100). As a result, a two-dimensional pattern image can be displayed on the display unit 70, and the refractive power of the eye E can be calculated based on the two-dimensional pattern image.

The measurement optical system 10 is not limited to the above, and a light projecting optical system that projects measurement light toward the fundus oculi Ef to be examined, and a reflected light acquired by reflection of the measurement light from the fundus oculi Ef is a light receiving element. And a measurement optical system having a light receiving optical system for receiving light. For example, the optical power measurement optical system may be configured to include a Shack-Hartmann sensor. Of course, other measurement type apparatuses may be used (for example, a phase difference type apparatus that projects a slit).

A beam splitter 29 is disposed between the objective lens 14 and the hall mirror 13. The beam splitter 29 guides a light beam from a fixation target presenting optical system 30 to be described later to the eye E, and guides reflected light from the anterior segment Ec of the eye E to the observation optical system 50. The beam splitter 29 transmits the fundus reflection light emitted from the light source 11 and reflected by the fundus oculi Ef, and guides it to the light receiving optical system 10b.

The fixation target presenting optical system 30 is provided for presenting a fixation target to the eye to be examined through the examination window 2. The fixation target presenting optical system 30 includes, for example, a visible light source 31, a fixation target plate 32 having a fixation target, a light projecting lens 33, a beam splitter 29, and an objective lens 14. When the visible light source 31 is turned on, the fixation target of the fixation target plate 32 is presented to the eye E. The visible light source 31 and the fixation target plate 32 are configured to be movable in the direction of the optical axis L3 by a slide mechanism (not shown). As the visible light source 31 and the fixation target plate 32 are moved in the direction of the optical axis L3, clouding of the eye E is performed. When moving the fixation target presentation position in the optical axis direction, the lens system may be moved.

A ring index projection optical system 45 and a working distance index projection optical system 46 are disposed in front of the anterior segment of the eye E. The ring index projection optical system 45 is an optical system that emits near-infrared light for projecting the ring index onto the cornea Ec of the eye E. The ring index projected onto the cornea Ec can also be used as an index for measuring the corneal shape. Further, the ring projection optical system 45 can also be used as anterior segment illumination for illuminating the anterior segment of the eye E. On the other hand, the working distance index projection optical system 46 is an optical system that emits near-infrared light for projecting an infinity index onto the cornea Ec of the eye E. Based on the position of the infinity index with respect to the cornea Ec, the position of the optometry apparatus 1 with respect to the eye E can be aligned.

In the observation optical system (imaging optical system) 50, the objective lens 14 and the beam splitter 29 are shared with the fixation target presenting optical system 30, and the half mirror 35, the imaging lens 51, and a two-dimensional imaging element (hereinafter, referred to as an optical imaging system). Imaging device) 52. The two-dimensional imaging device 52 has an imaging surface arranged at a position substantially conjugate with the anterior eye portion of the eye E to be examined. By this two-dimensional imaging element 52, an anterior segment image of the eye E is captured. An output from the two-dimensional imaging device 52 is input to the control unit 100, and as a result, an anterior eye part image of the eye E to be imaged by the two-dimensional imaging device 52 is displayed on the monitor 70. In this embodiment, the observation optical system 50 also serves as an optical system that detects an alignment index image formed on the cornea of the eye E by the working distance index projection optical system 46. The position of the alignment index image is detected based on the imaging result of the alignment index image by the two-dimensional image sensor 52.

Next, the control system of the device 1 will be described. The apparatus 1 has a control unit 100 as a main control system. The control unit 100 is a processing device having an electronic circuit that performs control processing of each unit of the device 1 and calculation processing of measurement results. The control unit 100 is electrically connected to each of the

light sources

11 and 31, the image sensor 22, the image sensor 52, the image sensor 202, and the drive unit 6, the display unit 70, the operation unit 300, the memory 105, and the position detection sensor 400. ing.

The control unit 100 includes a CPU 101, a ROM 102, and a RAM 103. The CPU 101 is a processing device for executing various processes related to the device 1. The ROM 102 is a nonvolatile storage device in which a control program and fixed data for the CPU 101 to perform various controls of the ophthalmologic apparatus 1 are stored.

The RAM 103 is a rewritable volatile storage device. In the RAM 103, for example, temporary data used for measurement of the eye E to be examined by the ophthalmologic apparatus 1 is stored.

The memory 105 is, for example, a rewritable nonvolatile storage device. The memory 105 stores at least a program for operating the present apparatus.

The position detection sensor 400 is a sensor for detecting the position of the measurement unit 3. The position detection sensor 400 is used to detect the position of the measuring eye in the left-right direction when measuring the distance between the pupils of the subject. As the position detection sensor 400, for example, an origin sensor that detects whether or not the measurement unit 3 is in a predetermined position is provided in the vicinity of the drive unit 6, and the rotation speed can be detected as an actuator in the left-right direction of the drive unit 6. It is conceivable to use a motor. In addition, the position detection sensor 400 may be a sensor that detects the position of the measurement unit 3 using a potentiometer or a rotary encoder.
<Operation>
The operation of the apparatus having the above configuration will be described. FIG. 3 is a flowchart showing an example of the operation of the apparatus according to the present embodiment.

The examiner operates the operation unit to make various settings as preparations for measurement. For example, identification information for identifying the subject is set. In this case, the control unit 100 may control the notification unit to explain the operation. As the notification unit, for example, the display unit 400 can be considered. In this case, instead of the display unit 400, an audio generation unit may be provided to explain by voice.

When the various settings are completed, the control unit 100 guides the subject to look into the examination window (for example, a message indicating that the examination window is looked at is notified). When the examinee looks into the examination window, the reflected light from the subject eye due to the anterior segment illumination is detected by the image sensor 52.

<Detection of reflected light from the eye to be examined>
The control unit 100 executes detection processing of reflected light from the eye to be examined based on the imaging signal from the imaging element 52. The reflected light from the eye to be examined may be, for example, reflected light from an alignment index projected onto the eye to be examined (for example, ring index R), or before the anterior segment image is formed by anterior segment illumination. It may be eye part reflected light (anterior eye part image Ea).

More specifically, the control unit 100 performs a process of detecting reflected light (for example, a corneal reflection bright spot) by an alignment index projected onto the eye to be examined, and determines whether or not the reflected light is detected. Also good. In addition, the control unit 100 performs a process of extracting a characteristic part (for example, pupil, iris, etc.) of the eye to be examined illuminated by the anterior segment illumination by image processing, and determines whether or not the characteristic part is detected. May be. Note that the control unit 100 may start detecting the position of the eye to be detected in the process of detecting the reflected light from the eye to be examined (details will be described later).

In the above detection process, when it is determined that the reflected light from the eye to be examined is detected, the control unit 100 uses this as a trigger to activate automatic alignment for the eye to be examined and to temporarily measure the eye refractive power by the measurement optical system. And fixation position control is started. In this case, the automatic alignment and the temporary measurement may be started at the same time, or one of them may be started first.

<Automatic alignment operation>
When the automatic alignment is activated, the control unit 100 detects the alignment state of the measurement unit 3 with respect to the eye to be inspected based on the imaging signal from the imaging element 52 by a predetermined alignment detection method. Thereby, the relative position of the measurement optical system 10 with respect to the eye to be examined is detected.

More specifically, the control unit 100 may obtain the alignment state in the vertical and horizontal directions with respect to the eye to be examined based on, for example, the center coordinates of the ring index R. In addition, when the measuring unit 3 is displaced in the working distance direction, the control unit 100 changes the image interval of the ring index R in the predetermined meridian direction while the interval of the infinity index M hardly changes. The alignment state in the working distance direction with respect to the eye to be examined may be obtained using the above characteristics (see, for example, JP-A-6-46999). The alignment detection method is not limited to the above method, and any method that can detect the alignment state with respect to the eye to be examined may be used. For example, the position of the characteristic part of the eye to be examined may be detected by image processing. Further, a light receiving element different from the observation optical system 50 may be provided, and the alignment state may be detected based on the light reception signal from the light receiving element (for example, the alignment light is irradiated from the oblique direction to the eye to be examined. May be detected from the diagonally opposite direction).

The control unit 100 controls the driving unit 6 based on the detection result of the alignment state, and moves the measuring unit 3 toward the eye to be examined. More specifically, the control unit 100 detects a positional deviation amount with respect to the eye to be examined based on an imaging signal from the imaging element 52, and controls the driving unit 6 so that the detected positional deviation amount satisfies an allowable range. . In this case, the control unit 100 does not necessarily need to detect the amount of misalignment, and may detect the direction of misalignment and move the measurement unit 3 in the direction in which the misalignment is corrected.

<Temporary measurement and fixation position control>
In the temporary measurement, the control unit 100 controls the measurement optical system based on the trigger signal for detecting reflected light, and measures the eye refractive power of the eye to be examined. More specifically, the control unit 100 may turn on the light source 11 based on a trigger signal for detecting reflected light. The measurement light emitted from the light source 11 passes through the dichroic mirror 15 via the relay lens 12 to the objective lens 14, and then is projected onto the fundus of the eye E through the pupil of the eye to be examined. Then, the reflected light from the fundus is collected by the objective lens 14 through the pupil of the eye to be examined and the dichroic mirror 15, and collected again on the aperture of the light receiving diaphragm 18 through the hall mirror 13 to the total reflection mirror 17. The collimator lens 19 generates a substantially parallel light beam (in the case of a normal eye), is extracted as a ring-shaped light beam by the ring lens 20, and is received by the image sensor 22 as a ring image. Then, the control unit 70 calculates the eye refraction value of the eye to be examined based on the image position of the ring image captured by the image sensor 22.

Next, the control unit 100 moves the fixation target presentation position according to the eye refraction value of the eye to be examined so that the fixation target is in a position conjugate with the fundus of the eye to be examined. Let This makes it possible to stabilize the fixation state even if the subject has high myopia or hyperopia. For example, the time until completion of automatic alignment can be shortened, and the main measurement of eye refractive power can be performed smoothly.

<Start measurement of eye refractive power>
Here, the control unit 100 determines whether or not the alignment state of the measurement unit 3 with respect to the eye to be examined is appropriate depending on whether or not the alignment states in the XYZ directions are within a predetermined allowable range. For example, a trigger signal (measurement start signal) is automatically issued to perform the main measurement of the eye refractive power measurement, and the measurement result of the main measurement is output to the display unit. In this case, the control unit may output the obtained measurement result to an external device (for example, a subjective optometer). Note that a subjective optometer may be a subjective refractor. In addition, the measurement optical system of the present embodiment may be provided with a subjective measurement function, and the obtained measurement result may be used as an initial value when performing the subjective measurement.

In addition, after the alignment state satisfies the allowable range, the control unit 100 may perform preliminary measurement of the eye refractive power again in a stage before performing the main measurement. In this case, the control unit 100 moves the fixation target presentation position based on the result so that the fixation target is located at a position conjugate with the fundus of the eye to be examined, and further, the amount of cloud fog corresponding to the applicable diopter is further increased. Move to take. The control unit measures the eye refractive power in a state where the eye to be examined is clouded and outputs the measurement result to the display unit.

When the measurement of one eye is completed as described above, the control unit 100 notifies a message that the opposite eye looks into the examination window 2. Thereafter, as in the case of one eye, the control unit 100 executes control for measuring the eye refractive power of the other eye.

Thereafter, when the measurement result of the eye refractive power with both eyes is obtained, the control unit 100 may display the measurement result with both eyes on the display unit 70. In addition, the control unit 100 may output the obtained measurement result of both eyes to an external device (for example, a subjective optometer). Note that a subjective optometer may be a subjective refractor. In addition, the measurement optical system of the present embodiment may be provided with a subjective measurement function, and the obtained measurement result may be used as an initial value when performing the subjective measurement.

In the above description, it is preferable that a fixation target is presented in advance to the eye to be examined before the reflection from the eye to be detected is detected. According to this, for example, the fixation direction of the subject when looking through the examination window is guided, so that the measurement optical system is smoothly guided into the movable range. As a trigger for presenting the fixation target, for example, the start or completion of the setting operation can be considered.

<Measurement of interpupillary distance>
Hereinafter, as an additional operation, a case where the distance between the pupils of the subject is measured will be described. FIG. 4 is an explanatory diagram showing an example when the interpupillary distance is measured by the apparatus according to the present embodiment. In this embodiment, the interpupillary distance can be measured when the eye refractive power of one eye is measured.

The control unit 100 may measure the interpupillary distance of the eye to be examined based on the detection result from the position detection sensor 400 and the imaging result from the imaging element 202. Note that the obtained measurement result may be output to the display unit 70 or an external device, similarly to the measurement result of the eye refractive power.

More specifically, the control unit detects the position of the measuring eye based on the detection result from the position detection sensor 400, and detects the position of the other eye based on the imaging result from the image sensor 202. When detecting the position of the measurement eye, for example, the control unit acquires the position of the measurement unit 3 in a state where the alignment with respect to the eye to be examined is completed by the automatic alignment control. When detecting the position of the other eye, for example, the control unit 100 images the other eye in a state where the alignment with respect to the eye to be examined is completed by the automatic alignment control. The control unit 100 detects the position of the other eye based on the captured image. As a method for detecting the position of the other eye, a method similar to the method for detecting the relative position of the measurement optical system with respect to the measurement eye can be used.

When obtaining the interpupillary distance, for example, the correspondence between the position of the measurement unit 3 and the distance of the measurement unit 3 with respect to the optical axis of the imaging optical system 200 is obtained in advance and stored in the memory 105 in advance. Thus, the control unit 100 can obtain the distance A of the measurement eye with respect to the optical axis L200 of the imaging optical system 200 by acquiring the position of the measurement unit 3. Further, the control unit 100 can obtain the distance B of the other eye with respect to the optical axis of the imaging optical system 200. The control unit 100 can obtain the interpupillary distance PD based on the distance A and the distance B. Regarding the distance B of the other eye, when the other eye is detected at a position closer to the measurement eye than the optical axis of the imaging optical system 200, the distance B is subtracted from the distance A. On the other hand, when another eye is detected at a position farther from the measuring eye than the optical axis of the imaging optical system 200, the distance B is added to the distance A.

As described above, the interpupillary distance can be measured without using a binocular camera by using the detection result from the position detection sensor and the imaging result from the imaging device that images the other eye.

In this embodiment, since the rough alignment with respect to the eye to be examined is performed by looking into the examination window, the positions of the left and right eyes are likely to fluctuate with respect to the apparatus. Therefore, by using the detection result from the position detection sensor and the imaging result from the image sensor, the position of both eyes can be properly detected and the interpupillary distance can be properly measured even in the above situation.

The left and right eyes may be discriminated using the image sensor 52 and the image sensor 202 (these positional relationships are known). Further, the position of the measuring eye is detected based on the imaging signal from the imaging device 52, the position of the other eye is detected based on the imaging signal with the imaging device 202, and the interpupillary distance is measured based on the detection result. You may make it do.

In the above description, the position of the optical axis of the imaging optical system 200 is used as a reference. However, the present invention is not limited to this. For example, any reference position may be set in the left-right direction of the subject. That is, if the relative positional relationship between the measurement unit 3 and the imaging optical system 200 is obtained in advance, both detection results can be associated to measure the interpupillary distance.

For example, the initial position of the measurement unit 3 may be used as a reference. In this case, the control unit 100 can obtain the distance C of the measurement eye with respect to the initial position by acquiring the position of the measurement unit 3. Furthermore, the control unit 100 can obtain the distance D of the other eye with respect to the imaging optical axis L200. Here, the distance E between the initial position of the measurement unit 3 and the optical axis of the imaging optical system 200 is obtained in advance and stored in the memory 105 in advance. Therefore, the control unit can obtain the interpupillary distance based on the distance C, the distance D, and the distance E.

When obtaining the detection result from the position detection sensor and the imaging result from the image sensor, the other eye may be imaged simultaneously with obtaining the detection result from the position detection sensor with the completion of alignment as a trigger. Deviations in measurement results due to movement of the subject can be prevented.

In the above description, the reflected light from the eye to be examined is detected using the reflected light from the anterior eye part of the eye to be examined looking through the examination window, but the present invention is not limited to this. For example, the reflected light from the eye to be examined may be detected using the reflected light from the fundus of the eye to be examined looking through the examination window. For example, the control unit projects the measurement light beam from the measurement optical system in advance, operates the automatic alignment for the eye to be inspected by using the measurement light beam from the fundus as received by the image sensor 22, and also measures the measurement optical system. Temporary measurement of eye refractive power and fixation position control may be started.

It should be noted that the fixation target presenting optical system 30 may include a plurality of fixation targets having different light flux diameters. Fixation target presentation optical system 30, for example, a first projection optical system for projecting a first fixation target formed by a light beam diameter limited from the optical axis direction of the measurement optical system 10 onto the eye to be examined, and a first projection A second projection optical system that projects a second fixation target formed with a larger beam diameter than the optical system onto the eye to be examined. As a configuration for forming the first fixation target, for example, an aperture for limiting the fixation light flux is arranged in the optical path. A laser light source may also be used. In addition, as the second fixation target, a configuration (for example, a target plate, a display, or the like) for forming a predetermined picture (a figure, a character, or a mark) is used. Further, the control unit 100 may control the fixation target presenting optical system 30 to switch from the first fixation target to the second fixation target. For example, the control unit 100 switches the fixation target using the detection of eye reflection or an alignment completion signal as a trigger. Thereby, the fixation operation of the eye to be examined can be performed smoothly.

In the above configuration, an optical system for objectively measuring the eye refractive power of the eye to be examined is used as the measuring optical system 10, but the present invention is not limited to this, and an optical system for examining the eye to be examined is used. If so, the application of this embodiment is possible.

2 Inspection Window 3 Measurement Unit 10 Measurement Optical System 30 Fixation Target Presenting Optical System 50 Observation Optical System 100 Control Unit 200 Other Eye Imaging Optical System 400 Position Detection Sensor

Claims

An inspection window for the patient to peek,
A measurement optical system that objectively measures the eye refractive power of the eye to be examined through the examination window;
A fixation target presenting optical system for presenting a fixation target to the eye to be examined through the examination window;
Presenting position changing means for changing the presenting position of the fixation target presented to the eye to be examined in the direction of the optical axis;
Relative position detection means for detecting the relative position of the measurement optical system with respect to the eye to be examined, and drive for operating automatic alignment by moving the measurement optical system with respect to the eye to be examined based on the detection result from the relative position detection means Control means;
An eye refractive power measuring device for measuring the eye refractive power of an eye to be examined,
Eye detection means for detecting reflection from the eye to be examined;
Control means for starting an automatic alignment operation by the drive control means using a detection signal from the eye detection means as a trigger;
An eye refractive power measuring device comprising:
The control means further uses the detection signal from the eye detection means as a trigger to automatically measure the eye refractive power of the eye to be examined by the measurement optical system before the alignment by the automatic alignment means is completed, The eye refractive power measuring apparatus according to claim 1, wherein the fixation target is moved to a position corresponding to a measurement result.
The control means automatically measures the eye refractive power of the eye to be examined by the measurement optical system after the alignment by the automatic alignment means is completed, and adjusts the position of the fixation target based on the measurement result. With
3. The eye refractive power measuring device according to claim 1, wherein an eye refractive value is output based on the measurement result of the eye refractive power after the adjustment.
The fixation target presenting optical system is:
A first projection optical system that projects a first fixation target formed by a light beam diameter limited from the optical axis direction of the measurement optical system onto the eye to be examined;
The second projection optical system for projecting a second fixation target formed with a larger beam diameter than the first projection optical system onto the eye to be examined. Eye refractive power measurement device.
In the eye refractive power measuring device according to claim 4,
The fixation target presenting optical system is controlled based on a detection result from at least one of the eye position detection means and the relative position detection means, and is switched from the first fixation target to the second fixation target. The eye refractive power measuring apparatus according to claim 4.
An imaging unit that is arranged at a position different from the inspection window and that images the other eye different from the measurement eye by the measurement optical system;
Position detecting means for detecting the position of the measuring optics;
Interpupillary distance measuring means for measuring the interpupillary distance of the eye to be examined based on the imaging result from the imaging means and the detection result from the position detecting means;
The ocular refractive power measuring apparatus according to claim 1, further comprising:
The interpupillary distance measuring means detects the position of the other eye based on the imaging result from the imaging means, and detects the position of the measuring eye in a state where the alignment by the automatic alignment means is completed. 7. The eye refractive power measuring apparatus according to claim 6, wherein detection is performed based on a detection result from the means.
The eye refractive power measuring apparatus according to any one of claims 1 to 7, wherein the eye detecting means detects reflection from an eye to be examined looking into the examination window.
The control means presents a fixation target in advance to the eye to be examined in advance before the reflection from the eye to be detected is detected by the eye detection means,
9. The eye refraction according to claim 1, wherein alignment by the drive control unit is started with a detection signal from the eye detection unit as a trigger for an eye to be examined in which the fixation target is presented in advance. Force measuring device.
The inspection window is provided at a fixed position with respect to the apparatus housing,
The eye refractive power measurement according to any one of claims 1 to 9, wherein a measurement unit including the measurement optical system is provided inside the apparatus housing and is movable with respect to the inspection window. apparatus.
The measurement unit is an anterior ocular segment observation optical system for observing the anterior ocular segment, and includes an anterior ocular segment observation optical system arranged coaxially with the measurement optical system as the eye detection means,
The drive control means causes the measurement unit to stand by at a position where the optical axes of the anterior ocular segment observation optical system and the measurement optical system pass through the examination window before the reflection from the eye to be examined is detected. The ocular refractive power measuring apparatus according to claim 10, wherein
An inspection window for the patient to peek,
A measurement optical system that objectively measures the eye refractive power of the eye to be examined through the examination window;
Driving means for moving the measurement optical system relative to the eye to be examined;
An eye refractive power measuring device for measuring the eye refractive power of an eye to be examined,
An imaging unit that is arranged at a position different from the inspection window and that images the other eye different from the measurement eye by the measurement optical system;
Position detecting means for detecting the position of the measuring optics;
Interpupillary distance measuring means for measuring the interpupillary distance of the eye to be examined based on the imaging result from the imaging means and the detection result from the position detecting means;
An eye refractive power measuring device comprising: