JP2024006535A - Optometer and optometry program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optometer and an optometry program which can smoothly perform subjective measurement.

SOLUTION: An optometer comprises: target presentation means which emits a target light flux to a subject eye; and correction means which changes the optical characteristics of the target light flux, and subjectively measures the eye refractive power of the subject eye. The optometer also comprises: objective eye refractive power acquisition means which acquires the objective eye refractive power in objective measurement of the subject eye; first distance acquisition means which acquires a first distance to a reference position for lens attachment from a cornea apex of the subject eye in the objective measurement of the subject eye; second distance acquisition means which acquires a second distance to a reference position for lens attachment from the cornea apex of the subject eye in the subjective measurement of the subject eye; conversion means which converts the first objective eye refractive power based on the first distance into the second objective eye refractive power based on the second distance when the first distance is different from the second distance; and output means which outputs the second objective eye refractive power.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present disclosure relates to an optometric apparatus and an optometric program that measure the eye refractive power of an eye to be examined.

An eye refractive power measurement device is known that projects a measuring light beam onto the fundus of the eye to be examined, receives the reflected light beam from the fundus with a light receiving element, and measures the objective ocular refractive power of the eye to be examined based on the output of the light receiving element. (Patent Document 1). For example, in an eye refractive power measurement device, the distance from the corneal apex position of the eye to be examined to the lens wearing reference position (corneal apex distance) assuming that the eye to be examined is wearing glasses is set to a predetermined distance in advance. ing.

In addition, using an eye refractive power measurement unit placed in front of the eye to be examined, an optical element such as a spherical lens or a cylindrical (astigmatism) lens is placed in the examination window of the eye refractive power measurement unit, and the optical element is inserted into the eye to be examined through the optical element. A subjective optometry device is known that measures the subjective refractive power of an eye to be examined by presenting an optotype (Patent Document 2).

At the start of subjective measurement using a subjective ophthalmoscopy device, the initial correction value (i.e., initial value) of the eye refractive power measuring unit is set to the objective eye refractive power so that the eye to be examined is corrected with a predetermined eye refractive power. Set based on power. Further, the distance between the corneal vertices of the eye to be examined is adjusted to a constant distance. In this state, subjective measurement is carried out to obtain the subjective eye refractive power.

Japanese Patent Application Publication No. 2006-187483 Japanese Patent Application Publication No. 5-176893

By the way, if the distance between the corneal vertices in the objective measurement of the subject's eye and the distance between the corneal vertices in the subjective measurement are different, an initial setting value based on the objective refractive power of the subject's eye may be set. Even though a predetermined eye refractive power is added to the eye to be examined, the eye may actually be corrected with an eye refractive power different from the predetermined eye refractive power. For example, in such a case, there is a problem that it takes time to obtain the subjective eye refractive power, and the subjective measurement cannot be carried out smoothly.

In view of the above-mentioned problems, the technical problem of the present disclosure is to provide an optometry device and an optometry program that can smoothly perform a subjective measurement of an eye to be examined.

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

(1) The optometry apparatus according to the first aspect of the present disclosure includes an optotype presentation device that emits an optotype light beam toward the eye to be examined, and a correction device that changes the optical characteristics of the optotype light beam, The optometry apparatus subjectively measures the eye refractive power of the eye to be examined, comprising an objective eye refractive power acquisition means for acquiring the objective eye refractive power in objective measurement of the eye to be examined; a first distance acquisition means for acquiring a first distance from the corneal apex of the subject's eye to a lens wearing reference position in objective measurement; and a second distance acquisition means for acquiring a second distance to the second distance; and when the first distance and the second distance are different, a first objective eye refractive power based on the first distance is set to the second distance and an output means for outputting the second objective eye refractive power.

(2) The optometry program according to the second aspect of the present disclosure includes an optotype presentation device that emits an optotype light beam toward the eye to be examined, and a correction device that changes the optical characteristics of the optotype light beam, An optometry program used in an optometry device that subjectively measures the eye refractive power of the eye to be examined, the program being executed by a processor of the optometry device to measure the objective eye refractive power in objective measurement of the eye to be examined. a first distance acquisition step of acquiring a first distance from the corneal apex of the eye to be examined to a lens wearing reference position in the objective measurement of the eye to be examined; a second distance acquisition step of acquiring a second distance from the corneal apex of the eye to be examined to a lens wearing reference position in subjective measurement of optometry; a conversion step of converting a first objective eye refractive power based on distance to a second objective eye refractive power based on the second distance; and an output step of outputting the second objective eye refractive power. It is characterized by having the device execute it.

(3) The optometry device according to the third aspect of the present disclosure is an optometry device that measures the eye refractive power of the eye to be examined, and which acquires the objective eye refractive power in the objective measurement of the eye to be examined. a refractive power acquisition means; a first distance acquisition means for acquiring a first distance from the corneal vertex of the eye to be examined to a lens wearing reference position in the objective measurement of the eye to be examined; and a first distance acquisition means in the subjective measurement of the eye to be examined. a second distance acquisition means for acquiring a second distance from the corneal apex of the eye to be examined to a lens wearing reference position; and a first distance acquisition means based on the first distance when the first distance and the second distance are different. It is characterized by comprising a conversion means for converting the eye refractive power into a second objective eye refractive power based on the second distance, and an output means for outputting the second objective eye refractive power.

FIG. 1 is an external view of the subjective optometry device according to the present embodiment. 2 is a schematic external view showing the front and rear surfaces of the eye refractive power measurement unit according to the present embodiment. FIG. FIG. 3 is a diagram showing a corneal position aiming unit. FIG. 3 is a configuration diagram of an aiming scale plate and a reticle plate. FIG. 2 is a schematic configuration diagram of a control system in a subjective optometry device. FIG. 3 is a flowchart showing the flow of subjective measurement. FIG. 1 is a configuration diagram of an objective eye refractive power measuring device and a subjective optometry device. FIG. 3 is a diagram showing an aiming scale plate and a reticle plate when confirming the corneal apex position. It is a schematic diagram of the 1st distance in objective type measurement, and the 2nd distance in subjective type measurement. FIG. 3 is a diagram illustrating an imaging device arranged in a corneal position aiming unit. FIG. 2 is an external view of a subjective optometry device.

<Summary>
An embodiment of an optometry apparatus according to this embodiment will be described. Items classified in <> below can be used independently or in conjunction.

The optometry device of this embodiment may be a subjective optometry device that subjectively measures the eye refractive power of the eye to be examined. For example, at least one of spherical power, cylindrical power, astigmatic axis angle, etc. may be measured as the eye refractive power of the eye to be examined. Of course, the subjective optometry device may measure binocular vision function (for example, at least one of prism amount, stereoscopic vision function, etc.), contrast sensitivity, etc. in addition to eye refractive power.

<Optotype presentation means>
The optometry apparatus of this embodiment may include an optotype presentation unit (for example, an optotype presentation section 60). The optotype presenting means emits an optotype light beam toward the eye to be examined.

For example, the optotype presenting means may be a display (for example, the display 61). Further, for example, the optotype presenting means may be a light source and a DMD (Digital Micromirror Device). Further, for example, the optotype presenting means may be a light source and an optotype board.

For example, the optotype light beam from the optotype presenting means may be guided directly toward the eye to be examined. Further, for example, the optotype light flux from the optotype presenting means may be guided toward the subject's eye via a light projection optical system (for example, the light projection optical system 230). For example, the projection optical system may include at least one optical member through which the optotype light flux emitted from the optotype presentation means passes. As an example, it may include at least one of a lens, a mirror, and the like.

<Correction means>
The optometry apparatus of this embodiment may include a correction means. The correction means changes the optical characteristics of the optotype light flux emitted from the optotype presenting means. For example, the correction means may be disposed in the optical path of the projection optical system to change the optical characteristics of the optotype light beam.

The correction means may have any configuration as long as it can change the optical characteristics of the optotype light beam.

For example, the correction means may include an optical element. For example, the optical element may be at least one of a spherical lens, a cylindrical lens, a variable focus lens, a cross cylinder lens, a rotary prism, a wavefront modulation element, and the like. Of course, the optical elements may be different from these. In this case, the optical characteristics of the optotype light beam are changed by controlling the optical elements.

Further, for example, the correction means may have a configuration for optically changing the presenting position (presenting distance) of the optotype with respect to the subject's eye. For example, it may have a configuration in which the optotype presentation means is moved in the optical axis direction, or it may have a configuration in which an optical element (for example, a spherical lens, etc.) in the optical path is moved in the optical axis direction. . In this case, the optical characteristics of the optotype light beam are changed by controlling the driving means for controlling at least one of the optotype presenting means and the optical element.

For example, the correction means may include an eye refractive power measuring unit (for example, an eye refractive power measurement unit) that switches and arranges an optical element (for example, the optical element 46) in front of the subject's eye via an examination window (for example, the examination window 53). It may also be a force measuring unit 50). For example, the eye refractive power measurement unit may include a lens disk (for example, lens disk 45) in which a plurality of optical elements are arranged on the same circumference. In this case, the optical characteristics of the optotype light beam are changed by controlling the driving means (for example, the driving section 56, the driving section 57, etc.) for controlling the lens disk.

<Objective eye refractive power acquisition means>
The optometry apparatus of this embodiment may include objective eye refractive power acquisition means (for example, the control unit 70). The objective eye refractive power acquisition means acquires the objective eye refractive power in objective measurement of the subject's eye. For example, the objective eye refractive power may be at least one of spherical power, cylindrical power, astigmatic axis angle, and the like.

For example, the objective eye refractive power acquisition means may acquire the objective eye refractive power input by the examiner's operation of the operating means (for example, the controller 71). Further, for example, the objective eye refractive power acquisition means may read an identifier for each subject and acquire the objective eye refractive power stored in the identifier. As an example, an ID, a character string, a one-dimensional code, a two-dimensional code, a color code, etc. may be used as the identifier. Further, for example, the objective eye refractive power acquisition means projects the measurement light beam onto the fundus of the eye to be examined, and receives the reflected light beam of the measurement light beam reflected by the fundus, thereby obtaining the objective eye refractive power of the eye to be examined. The objective eye refractive power may be acquired by receiving data measured using an eye refractive power measurement device that measures the eye refractive power visually.

In the above eye refractive power measuring device, a first distance (described later) from the corneal apex position to the lens wearing reference position in objective measurement of the eye to be examined may be set in advance as a predetermined distance. For example, the first distance is stored and set in advance in the device, with a standard distance (reference value) of 12 mm, which is generally considered to be the ideal distance between corneal vertices in Japan. Of course, the first distance may be a value different from 12 mm. Note that the first distance may be set as a fixed reference value, or may be set as a reference value that can be changed arbitrarily by the examiner. In this case, the objective eye refractive power acquisition means may receive at least any data such as spherical power, cylindrical power, astigmatic axis angle, etc. based on the first distance.

<First distance acquisition means>
The optometry apparatus of this embodiment may include a first distance acquisition means (for example, the control unit 70). The first distance acquisition means acquires a first distance from the corneal apex position of the eye to be examined to the lens wearing reference position in objective measurement of the eye to be examined. For example, the lens wearing reference position in objective measurement may be a position where the eyeglass lens is assumed to be placed when the eye to be examined wears the eyeglass lens. For example, a position separated by a standard distance (reference value) from the corneal apex position of the eye to be examined may be set as the lens wearing reference position.

For example, the first distance acquisition means may acquire the first distance input by the examiner's operation of the operation means. Further, for example, the first distance acquisition means may read an identifier for each subject and acquire the first distance stored in the identifier. Further, for example, the first distance acquisition means may acquire the first distance by receiving data from the eye refractive power measuring device described above. In this case, the first distance acquisition means and the objective eye refractive power acquisition means may be used together, and the data on the objective eye refractive power may be received together with the data on the first distance.

<Second distance acquisition means>
The optometry apparatus of this embodiment may include a second distance acquisition means (for example, the control unit 70). The second distance acquisition means acquires a second distance from the corneal apex position of the eye to be examined to the lens wearing reference position in subjective measurement of the eye to be examined. For example, the lens wearing reference position in subjective measurement may be a position where the eyeglass lens is assumed to be placed when the eye to be examined wears the eyeglass lens. For example, when the optometry apparatus includes an eye refractive power measurement unit, the position where the optical element of the lens disk closest to the eye to be examined is arranged may be the lens wearing reference position.

For example, the second distance acquisition means may acquire the second distance input by the examiner's operation of the operation means. Further, for example, the second distance acquisition means may acquire the second distance based on a detection result detected by a detection means described later. Further, for example, the second distance acquisition means may acquire a second distance that is preset as a fixed value in the subjective optometry device.

<Conversion means>
The optometry apparatus of this embodiment may include a conversion means (for example, the control section 70). The conversion means converts the first objective eye refractive power based on the first distance to the second objective eye refractive power based on the second distance when the first distance in the objective measurement and the second distance in the subjective measurement are different. Convert to refractive power. For example, the conversion means converts the first objective eye refractive power into the second objective eye refractive power by using a conversion table or an arithmetic expression for converting the first objective eye refractive power into the second objective eye refractive power. It can be converted into force. Further, for example, the conversion means uses a conversion table or an arithmetic expression for obtaining a conversion amount for converting the first objective eye refractive power to the second objective eye refractive power, The first objective eye refractive power may be converted into the second objective eye refractive power by adding a conversion amount to the force.

For example, such a conversion table or arithmetic expression may be used to correct a shift in the condensing position of the optotype light flux caused by a difference between the first distance in the objective measurement and the second distance in the subjective measurement. The above-mentioned conversion amount and second objective eye refractive power may be obtained. For example, the conversion table or calculation formula may be obtained in advance from the results of experiments or simulations, and stored in the storage means.

The converting means converts the first objective eye refractive power to the second objective eye refractive power when the difference between the first distance of the objective measurement and the second distance of the subjective measurement exceeds a predetermined threshold value (predetermined distance). It may also be converted into eye refractive power. For example, the predetermined threshold value for the difference between the first distance and the second distance may be set as a fixed value in advance, or may be set to an arbitrary value by the examiner.

The conversion means is configured such that the first distance in the objective measurement is different from the second distance in the subjective measurement, and the first objective eye refractive power in the objective measurement exceeds a predetermined threshold (predetermined refractive power). In this case, the first objective eye refractive power may be converted into a second objective eye refractive power. For example, the predetermined threshold value of the first objective eye refractive power may be set as a fixed value in advance, or may be set to an arbitrary value by the examiner. Further, for example, the predetermined threshold value of the first objective eye refractive power may be provided in a direction in which the first objective eye refractive power becomes negative, or may be provided in a direction in which the first objective eye refractive power becomes positive. . Of course, the predetermined threshold value of the first objective eye refractive power may be set for either the direction in which the first objective eye refractive power becomes negative or the direction in which the first objective eye refractive power becomes positive.

In this embodiment, the conversion means converts the first objective eye refractive power to the second objective eye refractive power according to the respective values of the first distance in the objective measurement and the second distance in the subjective measurement. It may be converted to Further, in the present embodiment, the converting means converts the first objective eye refractive power based on the determination result of whether or not the first distance of the objective measurement is different from the second distance of the subjective measurement. may be converted into a second objective eye refractive power. In this case, the optometry apparatus may include a determination unit that determines whether the first distance in the objective measurement and the second distance in the subjective measurement are different. Note that, for example, a tolerance range may be provided for the difference between the first distance and the second distance, and when the difference exceeds the tolerance range, it may be determined that the respective distances are different.

<Detection means>
The optometry apparatus of this embodiment may include a detection means. The detection means detects a second distance in subjective measurement of the eye to be examined. This makes it possible to easily determine whether the second distance in the subjective measurement matches the first distance in the objective measurement.

The detection means may have any configuration as long as it can measure the distance from the eye to be examined to the lens wearing reference position. For example, the detection means may be an image sensor for capturing an image of the eye to be examined, and the distance may be detected by analyzing an image captured by the image sensor. Further, for example, the detection means may project the index light beam onto the cornea of the eye to be examined and measure the distance using an alignment index image based on the reflected light beam obtained by reflecting the index light beam on the cornea. That is, the detection means may be an alignment optical system. Further, for example, the detection means may measure the distance by emitting an optical signal toward the eye to be examined and detecting a reflected signal obtained by reflecting the optical signal at the eye to be examined. That is, the detection means may be an optical detector. Further, for example, the detection means may measure the distance by emitting ultrasonic waves toward the eye to be examined and detecting reflected waves of the ultrasonic waves reflected by the eye to be examined. That is, the detection means may be an ultrasonic detector. Of course, optical systems and detectors different from these may be used.

<Output means>
The optometry apparatus of this embodiment may include an output means (for example, the control section 70). The output means outputs a second objective eye refractive power obtained by converting the first objective eye refractive power by the converting means.

For example, the output means may output the second objective eye refractive power in order to set the initial correction value of the correction means. In this case, the optometry apparatus may include correction control means (for example, the control unit 70) that sets the initial correction value of the correction means based on the second objective eye refractive power output from the output means. For example, the initial correction value of the correction means may be the value of the second objective eye refractive power. In other words, it may be a correction value for correcting the eye to be examined using the second objective eye refractive power. Further, for example, the initial correction value of the correction means may be a value different from the second objective eye refractive power, and may be a correction value calculated based on the second objective eye refractive power. For example, it may be a correction value for correcting the eye to be examined using the eye refractive power using the second objective eye refractive power as a guide. For example, the correction value may be a correction value for correcting the eye refractive power by adding or subtracting a predetermined step (for example, 0.25 D, etc.) from the second objective eye refractive power.

Note that the correction control means only needs to be able to change the refractive power of the eye to be examined based on the initial correction value. For example, the optotype presenting means may be moved in the optical axis direction based on the initial correction value. Further, for example, based on the initial correction value, an optical element in the optical path of the optotype light beam may be moved or inserted into or removed from the optical axis. When the optometry apparatus includes an eye refractive power measuring unit, the optical elements of each lens disk may be switched and arranged based on the initial correction value. By controlling at least one of the optotype presenting means and the optical element, the eye to be examined is corrected to have a predetermined eye refractive power at the start of subjective measurement of the eye to be examined, and the subjective measurement can be performed smoothly. It can be carried out.

For example, the output means may output the second objective eye refractive power in order to prompt the examiner to set the initial correction value of the correction means. In this case, the optometry apparatus may include display control means for displaying information based on the second objective eye refractive power on the display means based on the second objective eye refractive power output from the output means. Further, in this case, the optometry apparatus may include a print control unit that causes the printing unit to print information based on the second objective eye refractive power based on the second objective eye refractive power output from the output unit. .

Note that the information based on the second objective eye refractive power may be the value of the second objective eye refractive power, or the initial correction value of the correction means calculated based on the second objective eye refractive power. It may be. Further, the initial correction value of the correction means may be a value of the second objective eye refractive power, or may be a correction value calculated based on the second objective eye refractive power. For example, the examiner may input information based on the second objective eye refractive power acquired by at least one of the display control means, the print control means, etc. by operating the operation means. The correction control means may set the initial correction value of the correction means based on the operation signal from the operation means.

<Response input means>
The optometry apparatus of this embodiment may include response input means. The response input means is means for the subject to input a response based on reading the test optotype. For example, the response input means may be an operating means such as a lever switch or a push button switch (for example, the subject controller 220). Note that the response input means may be provided integrally with the casing of the optometric apparatus. Further, the response input means may be provided separately from the casing of the optometric apparatus.

The response input means may be configured to allow input in a plurality of predetermined directions. For example, input may be possible in four directions: up, down, left, and right. In other words, it may be possible to input angles of 0° (360°), 90°, 180°, and 270°. Of course, it may be possible to allow input in four or more directions, or it may be possible to allow input in all directions from 0° to 359°.

<Control means>
The optometry apparatus of this embodiment may include a control means. The control means automatically proceeds with the subjective measurement based on the input signal from the response input means after the initial correction value of the correction means is set by the correction control means. More specifically, after changing the refractive power for correcting the eye to be examined based on the initial correction value of the correction means, the subjective measurement is automatically proceeded based on the input signal from the response input means. . For example, a self-eye examination program for performing so-called self-eye examination, in which the subject performs a subjective measurement by himself/herself, may be performed. In self-optometry, it is not possible to easily match the second distance of subjective measurement to the first distance of objective measurement, so there is a high possibility that the eye will be corrected with a different eye refractive power at the start of subjective measurement. Become. However, as in the present embodiment, when the first distance and the second distance are different, the first objective eye refractive power based on the first distance is converted into the second objective eye refractive power based on the second distance. By outputting this information, the eye to be examined can be correctly corrected with a predetermined eye refractive power, and subjective measurement can be performed smoothly.

The optometry device of this embodiment may be an objective optometrist that objectively measures the eye refractive power of the eye to be examined, and in the objective optometrist, the first objective eye refraction based on the first distance is It is also possible to convert the power into a second objective eye refractive power based on the second distance and output this. In this case, the optometry apparatus includes an objective eye refractive power acquisition means for acquiring objective eye refractive power in objective measurement of the eye to be examined, and a lens wearing reference position from the corneal apex of the eye to be examined in objective measurement of the eye to be examined. a first distance acquisition means for acquiring a first distance from the corneal apex of the eye to be examined to the lens wearing reference position in subjective measurement of the eye to be examined; a converting means for converting a first objective eye refractive power based on the first distance into a second objective eye refractive power based on the second distance when and a second distance are different; and a second objective eye refractive power. and an output means for outputting.

Note that the present disclosure is not limited to the device described in this embodiment. For example, terminal control software (program) that performs the functions of the above embodiments is supplied to a system or device via a network or various storage media, and a control device (for example, a CPU, etc.) of the system or device reads the program. It is also possible to execute

<Example>
Examples of the optometry apparatus according to the present disclosure will be described below. Items classified in <> below can be used independently or in conjunction.

<Device configuration>
FIG. 1 is a perspective view showing the entire subjective optometrist 1 from the front side. For example, in this embodiment, the side where the subject's eye E is located is the front of the entire subjective optometry device, and the side where the examiner's eye OE is located is the back of the entire subjective optometry device.

For example, the subjective optometry device 1 includes a support arm 2, an optometry table 3, a controller 71, an eye refractive power measurement unit 50, an optometry presentation section 60, and the like. For example, the eye E to be examined observes a test optotype from the front of the eye refractive power measurement unit 50 through a test window 53, which will be described later. For example, the examiner's eye OE observes the front of the subject's eye E from the rear surface of the eye refractive power measurement unit 50 through an examination window 53, which will be described later. Further, for example, the examiner's eye OE observes the side of the subject's eye E from the rear surface of the eye refractive power measurement unit 50 through a confirmation window 11, which will be described later.

<Eye refractive power measurement unit>
The eye refractive power measurement unit 50 will be explained below. FIG. 2(a) is a schematic external view showing the eye refractive power measurement unit 50 according to the present example from the front (side of the eye E to be examined). FIG. 2(b) is a schematic external view showing the eye refractive power measurement unit 50 according to the present example from the rear (examiner's eye OE side). For example, the eye refractive power measurement unit 50 includes a forehead rest 51, a connecting portion 52, a forehead rest adjustment knob 5, an examination window 53, a moving unit 54, a pair of left and right lens chamber units 55, and the like.

For example, the forehead rest 51 fixes the position of the subject's face by coming into contact with the subject's forehead. Therefore, the eye E to be examined is kept at a constant distance from the examination window 53. For example, the connecting portion 52 has one end connected to the forehead rest 51 and the other end connected to the moving unit 54. For example, the forehead rest adjustment knob 5 is used to adjust the position of the forehead rest 51.

For example, the moving unit 54 includes a drive section 58, a drive section 59, and the like. For example, the drive unit 58 has a sliding mechanism and adjusts the interval between the lens chamber units 55. This allows the examiner to change the interval between the examination windows 53 in accordance with the interpupillary distance of the eye E to be examined. Further, for example, the drive section 59 has a convergence mechanism, and adjusts the convergence angle (closing angle) of the lens chamber unit 55. For the detailed configuration of the mobile unit, please refer to Japanese Patent Application Laid-Open No. 2004-329345.

For example, the lens chamber unit 55 includes a light source 40, a lens disk 45, a drive section 56, a drive section 57, a corneal position aiming unit 10, a suppression unit 30, and the like. For example, as the light source 40, an LED (Light emitting diode) or the like is used. For example, the light source 40 includes a first light source 40a that illuminates one of the left and right eyes to be examined, and a second light source 40b that illuminates the other of the left and right eyes to be examined (Fig. 2(a) and Figure 3). For example, in this embodiment, the first light source 40a is arranged in the left eye lens chamber unit 55L to illuminate the left eye EL, and the second light source 40b is arranged in the right eye lens chamber unit 55R to illuminate the right eye EL. Let us take as an example a configuration that illuminates the

For example, the lens disk 45 has a large number of optical elements 46 (spherical lens, cylindrical lens, dispersion prism, etc.) arranged on the same circumference. For example, the drive unit 56 (actuator, stepping motor, etc.) controls the rotation of the lens disk 45. As a result, the optical element 46 desired by the examiner is switched and placed in the examination window 53. For example, the drive unit 57 (motor, solenoid, stepping motor, etc.) rotationally controls the optical element 46 disposed in the inspection window 53. Thereby, the optical element 46 is arranged in the left and right inspection windows 53 at a rotation angle desired by the examiner.

For example, the lens disk 45 is composed of one lens disk or a plurality of lens disks. For example, when a plurality of lens disks (lens disk group) are provided, a driving section corresponding to each lens disk is provided. For example, each lens disk of a group of lens disks includes an aperture (or 0D lens) and a plurality of optical elements. Typical types of each lens disk include a spherical lens disk having a plurality of spherical lenses having different powers, a cylindrical lens disk having a plurality of cylindrical lenses having different powers, and an auxiliary lens disk. For example, at least one of a red filter/green filter, a prism, a cross cylinder lens, a polarizing plate, a Maddox lens, and an autocross cylinder lens is arranged on the auxiliary lens disk. For the detailed structure of the lens disk, please refer to JP-A No. 2007-68574 and JP-A No. 2011-72431.

<Cornea position aiming unit>
The corneal position aiming unit 10 will be explained below. FIG. 3 is a diagram showing the corneal position aiming unit 10. For example, the corneal position aiming unit 10 includes a first corneal position aiming unit 10a and a second corneal position aiming unit 10b. For example, in this embodiment, a configuration is exemplified in which the left eye lens chamber unit 55L has the first corneal position aiming unit 10a, and the right eye lens chamber unit 55R has the second corneal position aiming unit 10b.

For example, the first corneal position aiming unit 10a determines the corneal vertex of one eye to be examined (for example, the left eye EL in this embodiment) illuminated by the first light source 40a, and the lens wearing reference position (described later). Used to check the distance between vertices. For example, the first corneal position aiming unit 10a includes a first confirmation window 11a, a first observation window 12a, and a first corneal position aiming optical system 20a. For example, the first confirmation window 11a is used to confirm the first corneal position aiming optical system 20a arranged inside the eye refractive power measuring unit 50 from outside the eye refractive power measuring unit 50. For example, the first observation window 12a transmits the reflected light emitted from the first light source 40a and reflected by one eye to be examined (for example, the left eye EL) to the first observation window 12a arranged inside the eye refractive power measurement unit 50. It is used to guide light to the corneal position aiming optical system 20a.

For example, the first corneal position aiming optical system 20a guides the reflected light emitted from the first light source 40a and reflected by one eye to be examined (for example, the left eye EL) to the first confirmation window 11a. . For example, the first corneal position aiming optical system 20a includes a reflecting mirror 22, an aiming scale plate 23, a reticle plate 24, and the like. For example, the reflection mirror 22 is arranged in the lateral direction (X direction) of the left eye EL. For example, the sight scale plate 23 is provided between the reflection mirror 22 and the first confirmation window 11a. Note that the aiming scale plate 23 may be provided between the left eye EL and the reflecting mirror 22. For example, the reticle plate 24 is arranged on the back side of the first confirmation window 11a (inside the left eye lens chamber unit 55L).

For example, FIG. 4 is a configuration diagram of the aiming scale plate 23 and the reticle plate 24. 4(a) shows the aiming scale plate 23, and FIG. 4(b) shows the reticle plate 24. For example, the sight scale plate 23 is provided with several scale lines N1 to N5, a center line N6, and a first index 27. For example, the scale lines N1 to N5 correspond to corneal intervertex distances (see FIG. 3) = 12 mm, 13.75 mm, 16 mm, 18 mm, and 20 mm, in order. For example, scale line N2 (13.75 mm) serves as a reference position when wearing a lens, and is drawn to be distinguishable from other scale lines. For example, centerline N6 is used as a reference for aligning reticle 28 on reticle plate 24. Further, for example, the center line N6 is located at the left and right center of the aiming scale plate 23. For example, a reticle 28, a second indicator 29, etc. are attached to the reticle plate 24. For example, the reticle 28 is formed in a triangular shape. Further, the reticle 28 is located at the left and right center of the reticle plate 24. For example, on the outer periphery of the reticle plate 24, a numerical value 25 indicating the distance between corneal vertices is displayed.

For example, the first indicator 27 on the aiming scale plate 23 and the second indicator 29 on the reticle plate 24 are indicators for guiding the examiner's eye OE to a predetermined distance with respect to the reticle plate 24. For example, in this embodiment, when the examiner's eye OE is located 250 mm away from the reticle plate 24, the first index 27 and the second index 29 appear to overlap. For example, when the first marker 27 is located inside the second marker 29, the examiner's eye OE is positioned closer than 250 mm to the reticle plate 24. On the other hand, when the first marker 27 is located outside the second marker 29, the examiner's eye OE is located farther than 250 mm from the reticle plate 24. Please refer to Japanese Patent Laid-Open No. 2004-229769 for the detailed configuration of the aiming scale plate and the reticle plate and their positional relationship.

For example, the second corneal position aiming unit 10b determines the distance between the corneal vertex of the other eye to be examined (for example, the right eye ER in this embodiment) illuminated by the second light source 40b and the lens wearing reference position. Used to confirm. For example, the second corneal position aiming unit 10b includes a second confirmation window 11b, a second observation window 12b, and a second corneal position aiming optical system 20b. For example, the second confirmation window 11b is used to confirm the second corneal position aiming optical system 20b arranged inside the eye refractive power measurement unit from the outside of the eye refractive power measurement unit 50. Further, for example, the second observation window 12b receives the reflected light emitted from the second light source 40b and reflected by one eye to be examined (for example, the left eye EL). It is used to guide light to the second corneal position aiming optical system 20b.

For example, the second corneal position aiming optical system 20b guides the reflected light emitted from the second light source 40b and reflected by the other eye to be examined (for example, the right eye ER) to the second confirmation window 11b. . Note that the configuration of the second corneal position aiming optical system 20b is the same as that of the first corneal position aiming optical system 20a, and therefore the description thereof will be omitted in this embodiment. Of course, some of the configurations of these corneal position aiming optical systems may be different.

<Optotype presentation part>
The optotype presentation unit 60 presents a test optotype to the eye E to be examined. For example, the optotype presentation unit 60 may be a display, a light source and a DMD, a light source and an optotype board, or the like. In this embodiment, a display 61 is used as the optotype presentation section 60. For example, the display 61 may be an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), a plasma display, or the like.

The display 61 is placed at a position separated from the eye refractive power measurement unit 50 by a predetermined examination distance. For example, it is placed at a position separated by a distance distance (for example, 5 m) for performing a distance test on the eye E to be examined. The display 61 is connected to the controller 71 wirelessly or by wire, and displays the test target according to an operation signal input from the controller 71.

<Controller>
For example, the controller 71 inputs the subject's objective values (for example, spherical refractive power, cylindrical refractive power, astigmatic axis angle, etc.) and interpupillary distance, and inputs the optical element 46 in the eye refractive power measuring unit 50 and the examination window. It is used when switching the arrangement etc. of 53. Further, for example, the controller 71 is used when switching the test optotype to be presented to the eye E to be examined. For example, the controller 71 is not fixed to the optometry table 3, but can be carried by the examiner as desired.

For example, the controller 71 includes a display section 72. For example, the display section 72 displays information on the optical elements arranged in the eye refractive power measuring unit 50, refractive power information of the subject acquired from other devices, and the like. For example, an operation signal input from the controller 71 is input to the control unit 70 via a cable. Note that the operation signal from the controller 71 may be input to the control unit 70 via wireless communication such as infrared rays.

<Control unit>
For example, FIG. 5 is a schematic configuration diagram of a control system in the subjective optometric apparatus 1. As shown in FIG. For example, the control unit 70 includes a controller 71, a nonvolatile memory 73, a first light source 40a, a second light source 40b, and drive units (drive units 56, 57, 58, 59) included in each member of the eye refractive power measurement unit 50. , an optotype presentation unit 60 (display 61), and the like are electrically connected.

For example, the control unit 70 includes a CPU (processor), RAM, ROM, and the like. For example, the CPU controls each member in the subjective optometry device 1 . For example, RAM temporarily stores various information. For example, the ROM stores various programs for controlling the operation of the subjective optometry device 1. Note that the control unit 70 may be configured by a plurality of control units (that is, a plurality of processors).

For example, the nonvolatile memory 73 is a non-transitory storage medium that can retain stored contents even if the power supply is cut off. For example, as the nonvolatile memory 73, a hard disk drive, flash ROM, USB memory, etc. can be used.

<Control operation>
The operation of the subjective optometry apparatus having the above configuration will be explained.

The flow of subjective measurement using the subjective optometry device of this embodiment will be explained along the flowchart of FIG. For example, first, with the left eye corrected with a predetermined correction power (initial correction value) based on the objective eye refractive power (objective value), a subjective measurement of the left eye is performed, and the subjective eye refraction of the left eye is corrected. Gain power (awareness value). After the measurement of the left eye is completed, the measurement of the right eye is performed in the same manner, and the subjective value of the right eye is obtained.

<Acquisition of objective values in the subjective optometry device (S1)>
In step S1, a first objective value used to start subjective measurement of the eye to be examined is acquired. The examiner calls out the first objective value of the eye to be examined, which has been measured in advance using the objective eye refractive power measuring device 100 (see FIG. 7), and causes the subjective optometrist to receive it. For example, the first objective value is stored in a memory (not shown) of the objective eye refractive power measuring device 100 in association with the ID of the subject. For details of objective measurement using an objective eye refractive power measuring device, please refer to, for example, Japanese Patent Application Laid-Open No. 2005-185523.

FIG. 7 is a configuration diagram of an objective eye refractive power measuring device and a subjective optometry device. For example, in this embodiment, the objective eye refractive power measuring device 100 and the subjective optometry device 1 are connected wirelessly. This allows data to be transmitted and received between the objective eye refractive power measurement device 100 and the subjective optometry device 1. Of course, these devices may be connected by wire rather than wirelessly.

For example, the examiner operates the controller 71 of the subjective optometrist 1 and inputs the ID of the subject. The control unit 70 of the subjective optometry device 1 outputs an operation signal to the objective eye refractive power measuring device 100 so as to transmit the first objective value associated with the ID of the subject. When the control unit (not shown) of the objective eye refractive power measuring device 100 receives the ID of the examinee from the subjective optometry device 1, it reads the first objective value corresponding to the ID of the examinee from the memory, and It is transmitted to the optometry device 1. The control unit 70 of the subjective optometry device 1 receives the first objective value transmitted from the objective eye refractive power measurement device 100. Thereby, the control unit 70 can acquire the first objective value of the eye to be examined.

<Acquisition of first distance in subjective optometry device (S2)>
In step S2, the distance V1 between the corneal vertices (hereinafter referred to as the first distance V1) in the objective measurement of the eye E to be examined is acquired. For example, the first distance V1 of the objective measurement is the position from the corneal vertex of the eye E to the position where the eyeglass lens is assumed to be placed when the eye to be examined wears the eyeglass lens (lens wearing reference position). This is the distance to. Note that details of the first distance V1 will be described later. In objective measurement, a first distance V1 is set as a predetermined distance in advance, and a first objective value based on the first distance V1 is acquired. For example, in this example, the first distance V1 is set to 12 mm, and it is assumed that the eyeglass lens is placed 12 mm ahead of the eye E to be examined, and the eye refractive power of the eye E to be corrected to 0D (for example, At least one of dioptric power, cylindrical dioptric power, astigmatic axis angle, etc.) is acquired as the first objective value based on the first distance V1.

The first distance V1 in the objective measurement of the eye E to be examined is obtained based on data transmission and reception between the objective eye refractive power measurement device 100 and the subjective optometry device 1. For example, the first distance V1 is transmitted from the control unit of the objective eye refractive power measurement device 100 to the control unit 70 of the subjective optometry device 1 together with the first objective value in step S1. Thereby, the control unit 70 can acquire the first distance V1.

<Obtaining the second distance in the subjective optometry device (S3)>
In step S3, the distance V2 between the corneal vertices (hereinafter referred to as second distance V2) in the subjective measurement is acquired. For example, the second distance V2 of the subjective measurement is the distance from the position of the corneal vertex of the eye E to the position where the eyeglass lens is placed when the eye to be examined wears the eyeglass lens (lens wearing reference position). . Note that details of the second distance V2 will be described later. In the subjective measurement, the second distance V2 is obtained by measuring the second distance V2 using the corneal position aiming unit 10.

First, the examiner instructs the subject to look into the examination window 53. The subject contacts the forehead rest 51 of the eye refractive power measurement unit 50 with his/her face and looks into the examination window 53 in accordance with the examiner's instructions. Here, when the examiner operates the controller 71 to set a mode for observing the position of the corneal apex of the subject, the control unit 70 turns on the first light source 40a and the second light source 40b, respectively. As a result, the left eye EL and right eye ER are illuminated with a sufficient amount of light.

Next, the examiner looks into the first confirmation window 11a provided in the left eye lens chamber unit 55L in order to confirm the position of the corneal apex of the left eye EL. FIG. 8 is a diagram showing the aiming scale plate 23 and the reticle plate 24 when confirming the position of the corneal apex. The examiner searches for a position where the first indicator 27 on the aiming scale plate 23 and the second indicator 29 on the reticle plate 24 match vertically and horizontally, and where the first indicator and second indicator overlap and appear as one. . Furthermore, the examiner searches for a position where the tip of the reticle 28 and the center line N6 appear to match.

For example, as described above, the examiner operates the forehead rest adjustment knob 5 (see FIG. 2(b)) while checking the side of the left eye EL using the first confirmation window 11a to determine the ocular refraction. The position of the forehead rest 51 in the force measurement unit 50 is adjusted. This allows the position of the corneal apex of the left eye EL to be moved. For example, if the corneal apex of the left eye is located around the scale line N2, but slightly deviates from the scale line N2, by operating the forehead rest adjustment knob 5, the position of the corneal apex can be changed to the scale line N2. can be matched. Thereafter, the examiner similarly uses the second confirmation window 11b to match the position of the corneal apex of the right eye ER with the scale line N2. Note that the positions of the corneal vertices of the left eye EL and the right eye ER may be adjusted from either side.

In this example, since the position of the corneal apex of the eye E to be examined matches the scale line N2, the second distance V2 of the eye E to be examined is 13.75 mm. For example, the examiner reads the numerical value 25 indicating the distance between the corneal vertices based on the scale line N2, and inputs the second distance V2 using the controller 71. Thereby, the control unit 70 can acquire the second distance V2.

<Conversion of initial value in subjective measurement (S4)>
In order to start subjective measurement of the eye E, the control unit 70 applies a predetermined correction power (i.e., , initial value). For example, a predetermined initial stage is applied to the eye E so that the optotype light flux from the display 61 is condensed on the retina via the optical element 46 (in other words, so that the eye refractive power of the eye E becomes 0D). Add value. As an example, if the objective values of the eye E to be examined are spherical power -2.0D, cylindrical power -1.0D, and astigmatic axis angle 45 degrees, the eye refraction can be adjusted by adding these powers and angles as initial values. The force becomes 0D.

In step S4, the initial value at the time of starting such a subjective measurement is converted as necessary. In this embodiment, the control unit 70 controls the initial value of the subjective measurement based on the first objective value and the first distance V1 in the objective measurement of the eye E and the second distance V2 in the subjective measurement. The value is set. This will be explained in detail below.

FIG. 9 is a schematic diagram of the first distance in objective measurement and the second distance in subjective measurement. FIG. 9(a) shows the first distance. FIG. 9(b) shows the second distance. For example, as described above, the first distance V1 in the objective eye refractive power measuring device 100 is from the position of the corneal apex 82 of the eye E to the lens where the eyeglass lens 80 is placed when the eye to be examined wears the eyeglass lens. This is the distance to the reference wearing position. More specifically, it is the distance from the position of the corneal apex 82 of the eye to be examined to the position 81 of the rear surface of the spectacle lens 80. For example, the second distance V2 in the subjective optometrist 1 is the distance from the corneal vertex 82 of the eye E to the lens wearing reference position, as described above. In this embodiment, an eye refractive power measurement unit 50 is present in front of the eye E to be examined, and an examination window 53 and a plurality of lens disks 45 are arranged in this order in the direction away from the eye E to be examined. For example, among the plurality of lens disks 45, the optical element 46a included in the lens disk 45 closest to the eye E to be examined is placed next to the examination window 53. In the subjective optometry device 1, the second distance V2 can be considered as the distance from the position of the corneal apex 82 of the eye to be examined to the position of the rear surface of the optical element 46a.

Here, if the first distance V1 of the objective measurement and the second distance V2 of the subjective measurement are different, even if an initial value based on the first objective value of the eye to be examined is added, the eye of the eye to be examined is The refractive power may not be corrected to 0D.

For example, in FIG. 9(a), the distance between the corneal vertices of the eye E to be examined is a first distance V1, and the optotype light flux heading toward the eye E is refracted by the spectacle lens 80, the cornea, and the crystalline lens, and is placed on the retina. The light is focused on the light focusing position f1. In other words, the eye refractive power of the eye E to be examined is corrected to 0D. On the other hand, for example, as shown in FIG. 9(b), when the distance between the corneal vertices of the eye E to be examined is a second distance V2 that is longer than the first distance V1, the optotype light flux toward the eye E to be examined is directed to the eyeglass lens 80. The light is refracted by the optical element 46a located further in front of the retina, the cornea, and the crystalline lens, and is focused at a focusing position f2 deeper than the retina. Note that when the spectacle lens 80 and the optical element 46a are negative lenses, the longer the second distance V2 is with respect to the first distance V1, the farther the optotype light beam is located than the retina. Further, although not shown, the shorter the second distance V2 is with respect to the first distance V1, the closer the optotype light beam is to the retina.

Therefore, if the first objective value of the eye to be examined is set as the initial value for subjective measurement, if there is a deviation V3 between the first distance V1 and the second distance V2, the light focusing position f1 and the light focusing position f2 will be Since the deviation 84 occurs, the actual eye refractive power when the eye to be examined looks at the display 61 through the eye refractive power measurement unit 50 is corrected to a value different from 0D. For example, even if the first objective value of the subject's eye is a spherical power of -2.0 and a -2.0D spherical lens is placed as the optical element 46, the subject's eye will still be affected by the spherical lens (which is weaker than -2.0D). For example, the situation is the same as viewing the test target through a lens (such as -1.75D).

Therefore, in this embodiment, when the first distance V1 of the objective measurement and the second distance V2 of the subjective measurement are the same distance, the first objective value of the objective measurement is changed to the first objective value of the subjective measurement. Set as the initial value. In addition, when the first distance V1 of the objective measurement and the second distance V2 of the subjective measurement are different distances, the first objective value of the objective measurement is set to the first distance V1 and the second distance V2. A second objective value converted (corrected) based on the above is determined, and this second objective value is set as an initial value for the subjective measurement.

In this embodiment, the first objective value of the eye to be examined is converted based on the amount of deviation between the first distance V1 and the second distance V2. For example, using a lookup table that associates the first objective value of the eye to be examined with the amount of deviation between the first distance V1 and the second distance V2, the first objective value based on the first distance V1 is calculated. A correction amount for converting into a second objective value based on the second distance V2 is determined. As an example, the lookup table can determine the amount of correction to be added to the first objective value by referring to the first objective value of the eye to be examined and the amount of deviation between the first distance V1 and the second distance V2. It has become sought after.

For example, the lookup table may be set in advance based on the results of experiments or simulations. As an example, the refractive power corresponding to the shift 84 of the focusing position of the optotype light flux that changes due to the difference between the first distance V1 and the second distance V2 is determined by experiment or simulation, and this refractive power is used as the correction amount. It may be set in advance so that it can be acquired. Note that the lookup table may be provided for each spherical power, cylindrical power, and astigmatic axis angle, and is stored in the nonvolatile memory 73.

For example, the control unit 70 calls a lookup table from the nonvolatile memory 73 and refers to the first objective value of the eye to be examined and the amount of deviation between the first distance V1 and the second distance V2. In this example, the first distance V1 is 12 mm and the second distance V2 is 13.75 mm, so the amount of deviation is 1.75 mm. Thereby, the control unit 70 obtains the correction amount corresponding to the deviation amount of 1.75 mm for converting the first objective value to the second objective value, and adds the correction amount to the first objective value. The second objective value can be obtained using the second objective value.

<Measurement of subjective value (S5)>
In step S5, the second objective value acquired in step S4 is set as an initial value, and subjective measurement of the eye to be examined is started. For example, the control unit 70 controls the rotation angle of the lens disk 45 and the rotation angle of the optical element 46 to correct the eye E to be examined using the second objective value. For example, the rotation angle of the lens disk 45 is changed, and the optical element 46 having the spherical power and the cylindrical power of the second objective value is placed in the optometry window 53. Furthermore, the rotation angle of the optical element 46 having the cylindrical power of the second objective value is changed, and the optical element 46 is placed in the optometry window 132 at the astigmatic axis angle of the second objective value. Thereby, the second objective value can be added to the eye E to be examined. As a result, even if the first distance V1 of the objective measurement and the second distance V2 of the subjective measurement are different, the deviation 84 (see FIG. 9(b)) in the focal positions (f1 and f2) is corrected. , the optotype light beam incident on the eye to be examined is focused on the retina via the optical element 46 (the eye refractive power of the eye to be examined is corrected to 0D).

The examiner proceeds with subjective measurement of the eye E to be examined at a long distance while changing the test optotype presented to the eye E to be examined and the correction power for correcting the eye to be examined. For example, the examiner operates the controller 71 to select a desired test target. The control unit 70 reads the corresponding test optotype data from the nonvolatile memory 73 in response to an input signal from the controller 71 and causes the display 61 to display the data. The test optotype displayed on the display 61 is presented to the eye E through the test window 53 and the optical element 46 in the eye refractive power measurement unit 50 . For example, while switching the test optotype, the examiner asks the subject how the test optotype looks. As an example, if the test subject's answer is correct, the visual target is switched to one with a visual acuity value one level higher. Further, as an example, if the test subject's answer is incorrect, the visual target is switched to one with a visual acuity value one level lower. Furthermore, for example, the examiner performs the examination while changing the test optotype and changing the correction power of the eye E to be examined.

<Acquisition of perceived value (S6)>
In step S6, the subjective value of the eye E to be examined is acquired. For example, the control unit 70 stores measurement results such as spherical power, cylindrical power, astigmatic axis angle, etc. in the nonvolatile memory 73 as the subjective values of the eye E to be examined. Further, the subjective value of the eye E to be examined is displayed on the display section 72 of the controller 71.

As described above, for example, the optometry apparatus of this embodiment includes an objective eye refractive power acquisition means for acquiring objective eye refractive power in objective measurement of the eye to be examined, and an objective eye refractive power acquisition means for acquiring objective eye refractive power in objective measurement of the eye to be examined. A first distance acquisition means for acquiring a first distance from the corneal apex of the eye to be examined to a reference lens wearing position, and a second distance from the corneal apex of the eye to be examined to the lens wearing reference position in subjective measurement of the eye to be examined. a second distance acquisition means; conversion for converting a first objective eye refractive power based on the first distance into a second objective eye refractive power based on the second distance when the first distance and the second distance are different; and an output means for outputting the second objective eye refractive power. For example, if the first distance and the second distance are different, the convergence position of the optotype light beam incident on the subject's eye will shift, and at the start of subjective measurement of the subject's eye, correction will actually be made using different eye refractive powers. There is a possibility that However, by outputting the second objective eye refractive power that takes into account such a shift in the light focusing position, it is possible to correctly correct the eye to be examined so that it has a predetermined eye refractive power (for example, 0D). , subjective measurements can be performed smoothly.

Further, for example, the optometry apparatus of this embodiment sets the initial correction value of the correction means based on the second objective eye refractive power obtained by converting the first objective eye refractive power. As a result, at the start of subjective measurement of the eye to be examined, the eye to be examined can be easily corrected with a predetermined eye refractive power so that the shift in the condensing position of the optotype light beam incident on the eye to be examined is suppressed. , subjective measurements can be performed smoothly.

<Transformation example>
In this embodiment, when acquiring the second distance V2 in the subjective measurement of the eye E, the position of the corneal apex 82 is finely adjusted in accordance with the scale line N2 closest to the corneal apex 82 of the eye E, and the numerical value is Although the explanation has been given using an example of reading and inputting 25, the present invention is not limited to this. For example, a scale line on which the corneal apex 82 of the eye E to be examined is placed may be determined, and a value of 25 corresponding to this scale line may be set in advance as the second distance V2. That is, the second distance V2 may be set in advance as a fixed distance. This eliminates the need for the examiner to input the second distance V2 into the device. In this case, the examiner operates the forehead rest adjustment knob 5 (see FIG. 2(b)) so that the position of the corneal apex 82 of the eye E to be examined coincides with the predetermined scale line, so that the second distance V2 can be matched.

In addition, in this embodiment, a lookup table that associates the first objective value of the eye to be examined with the amount of deviation between the first distance V1 and the second distance V2 is used to obtain the first objective value based on the first distance V1. Although the explanation has been given using an example in which a correction amount for converting a first objective value to a second objective value based on the second distance V2 is determined, the present invention is not limited to this. For example, a predetermined calculation formula that can calculate the correction amount based on the first objective value of the eye to be examined and the amount of deviation between the first distance V1 and the second distance V2 may be used.

Furthermore, in this example, the second objective value obtained by adding the correction amount to the first objective value of the eye E to be examined is set as the initial value of the subjective measurement. Not limited. For example, it may be possible to select which of the first objective value and the second objective value of the eye E to be examined is to be set as the initial value of the subjective measurement. In this case, the control unit 70 displays on the display unit 72 of the controller 71 the first objective value obtained by objective measurement and the second objective value obtained by adding the correction amount to the first objective value. You may. Further, the control unit 70 may set a value according to an operation signal based on the examiner's selection as an initial value, and may switch and arrange the optical elements.

In this embodiment, when the first distance V1 of the objective measurement and the second distance V2 of the subjective measurement are different, the second objective value obtained by converting the first objective value of the objective measurement is Although the explanation has been given using an example of setting an initial value when starting a subjective measurement, the present invention is not limited to this. For example, when the first distance V1 and the second distance V2 of the subjective measurement are different and the first objective value exceeds a predetermined threshold, the control unit 70 changes the first objective value to the second objective value. The initial value may be set based on the second objective value. For example, when the spherical power S in the first objective value exceeds a predetermined threshold value, the first objective value may be converted to the second objective value. Further, for example, when the cylinder power C in the first objective value exceeds a predetermined threshold value, the first objective value may be converted to the second objective value. Further, for example, when the astigmatic axis angle A in the first objective value exceeds a predetermined threshold value, the first objective value may be converted to the second objective value. In this embodiment, the first objective value may be converted to the second objective value when at least the spherical power S exceeds a predetermined threshold value.

For example, in the optometry apparatus of this embodiment, when the first distance in objective measurement is different from the second distance in subjective measurement, and further, the first objective eye refractive power exceeds a predetermined threshold value, Then, the first objective eye refractive power based on the first distance is converted into the second objective eye refractive power based on the second distance. For example, the larger the absolute value of the first objective eye refractive power (that is, the higher the first objective eye refractive power is), the greater the difference between the first distance in objective measurement and the second distance in subjective measurement. The change in actual eye refractive power caused by these differences is large. Therefore, in situations where the influence of the difference between the first distance and the second distance becomes greater, by converting the first objective eye refractive power to the second objective eye refractive power and outputting it, the eye to be examined can be adjusted to a predetermined position. It can be corrected correctly using eye refraction.

Although the present embodiment has been described using an example in which the examiner reads the second distance V2 using the aiming scale plate 23 and the reticle plate 24, the present invention is not limited thereto. For example, the eye refractive power measurement unit 50 may be provided with a detection section for detecting the second distance V2, so that the second distance V2 can be automatically acquired. In this embodiment, a case where an image sensor is used as such a detection section will be exemplified.

FIG. 10 is a diagram illustrating the arrangement of an image sensor in a corneal position aiming unit. For example, the image sensor 13 for detecting the second distance V2 is arranged behind the first confirmation window 11a and the second confirmation window 11b, respectively. Thereby, the reflected light emitted from the first light source 40a and reflected by the subject's eye E is imaged by the image sensor 13 via the first observation windows 12a, 20a, 23, 24, and 11a. Similarly, reflected light emitted from the second light source 40b and reflected by the subject's eye E is imaged by the image sensor 13 via the second observation windows 12b, 20, 23, 24, and 11b. As a result, a captured image including the corneal apex 82, the aiming scale plate 23, and the reticle plate 24 of the eye E to be examined is obtained.

The control unit 70 detects the corneal apex 82 of the eye E to be examined and the scale lines (N1 to N5) of the aiming scale plate 23 by analyzing the captured image. For example, as a method for detecting the corneal apex 82 and scale lines of the left eye EL, edge detection using brightness values may be used. The control unit 70 also detects the scale line with which the corneal apex 82 of the eye E is in contact. For example, a distance between corneal vertices is associated with each scale line, and the second distance V2 can be obtained based on the scale line. For example, for the right eye ER, the second distance V2 can be obtained by similarly executing the analysis process of the photographed image. In addition, in the above, the image sensor 13 may have any configuration as long as it is disposed at a position where it can detect the second distance V2, and is not limited to this embodiment.

For example, as described above, the optometric apparatus of the present embodiment detects the second distance in the subjective measurement of the eye to be examined, and acquires the second distance based on the detection result. This makes it possible to easily determine whether the second distance in the subjective measurement matches the first distance in the objective measurement. As a result, the eye to be examined can be corrected with an appropriate eye refractive power based on the first objective eye refractive power or the second objective eye refractive power.

Although the present embodiment has been described using as an example a configuration in which the position of the corneal apex 82 of the eye to be examined is acquired at the start of the subjective measurement of the eye to be examined, the present invention is not limited to this. For example, the position of the corneal apex 82 may be acquired even during subjective measurement of the eye E to be examined. For example, the control unit 70 acquires an image captured by the image sensor 13 in real time, and when the position of the corneal apex 82 changes (in other words, when the second distance V2 changes), the control unit 70 causes a notification unit (not shown) to notify the user of this change. may be notified. For example, a permissible range may be provided for detecting whether the position of the corneal apex 82 has changed. For example, the notification unit may be at least one of a speaker, a buzzer, a display, and the like. Thereby, the subjective measurement of the eye E to be examined can be performed with high precision.

In addition, the conversion of the initial value at the start of the subjective measurement in this example is performed by having an optotype presentation part in the housing for presenting the test optotype to the eye E, and converting the optotype from the optotype presentation part A space-saving subjective optometry device (e.g., Japanese Patent Laid-Open Publication No. 2003-120003 2019-000346)).

Furthermore, the conversion of the initial value at the start of the subjective measurement in this example can be applied to so-called self-optometry, in which the examiner performs the subjective measurement by himself/herself without the examiner being present with the patient. is possible. For example, in this case, a controller for the examinee to input answers by the examinee may be provided in the subjective optometry device 1 as shown in FIG. A controller for users may also be provided. Hereinafter, such self-eye examination will be explained using a space-saving subjective eye examination apparatus as an example.

FIG. 11 is an external view of a space-saving subjective optometry device 200. FIG. 11A is a perspective view of the external appearance of the subjective optometrist 200. FIG. 11(b) is a side view of the interior of the subjective optometry device 200. For example, the subjective optometrist 200 includes a housing 201, a presentation window 202, a speaker 203, a holding unit 204, an examiner controller 210, a subject controller 220, an eye refractive power measurement unit 240, and the like. Note that the eye refractive power measuring unit 240 has the same configuration as the eye refractive power measuring unit 50 described above, and the description thereof will be omitted here.

The housing 201 has a light projection optical system 230 inside. The presentation window 202 transmits the optotype light flux produced by the projection optical system 230. The speaker 203 outputs audio guidance and the like. Holding unit 204 holds eye refractive power measurement unit 240 .

The examiner controller 210 is used by the examiner to operate the subjective optometrist 200. The examiner controller 210 includes a switch section 211, a monitor 212, and the like. The switch unit 211 inputs signals for performing various settings (for example, movement of the eye refractive power measurement unit 240, etc.). The monitor 212 displays various information (eg, measurement results of the eye E, etc.). Note that the monitor 212 may function as a touch panel that also serves as the switch section 211. Signals from the examiner controller 210 are output to a control section (not shown) via wired or wireless communication.

The subject controller 220 is used to input the subject's answers. The subject controller 220 includes an answer lever 221, an answer button 222, and the like. The answer lever 220 is used when the subject inputs the direction with respect to the test target. For example, signals in four directions, up, down, left and right, can be input by tilting the device. The answer button 222 is used when the subject does not select a direction with respect to the test target. Signals from the subject controller 220 are output to a control section (not shown) via wired or wireless communication.

The light projection optical system 230 (see FIG. 11(b)) projects a target light beam toward the eye E to be examined. For example, the projection optics 230 includes a display 231, a plane mirror 232, a concave mirror 233, and the like. The optotype light flux emitted from the display 231 is guided out of the housing 201 via a plane mirror 232, a concave mirror 233, and a plane mirror 232 in this order, and is further passed through a presentation window 202 and an eye refractive power measurement unit. The image is projected onto the eye E through the inspection window and optical element 240.

In such a subjective ophthalmoscopy device 200, an initial value is set so that the eye E to be examined has a predetermined eye refractive power (0D, etc.) based on the first objective value of the eye E to be examined. When the application is executed, the subjective measurement automatically proceeds. Here, for example, in self-eye examination, the subject can start the subjective measurement by operating the subject controller 220 after touching the face to the forehead rest. At this time, the examiner is not necessarily present, and the second distance V2 of the subjective measurement is likely to be a different distance from the first distance V1 of the objective measurement. For this reason, especially in self-eye examination, deviations in the actual eye refractive power are likely to occur because the first distance V1 and the second distance V2 do not match.

In this embodiment, the subjective optometry apparatus 200 also uses the first objective value and the first distance V1 of the objective measurement of the eye E to be examined, and the second distance V2 of the subjective measurement of the eye E to be examined. , the initial value for subjective measurement may be set. As an example, the control unit may acquire the second distance V2 by using a detection unit (imaging device) provided in the eye refractive power measurement unit 240 and analyzing the captured image. Further, if the first distance V1 and the second distance V2 are different, the first objective value based on the first distance V1 is converted into a second objective value based on the second distance V2, and this is converted into a second objective value based on the second distance V2. It may also be set as the initial value for formula measurement.

In this way, the optometry apparatus of this embodiment presents the test optotype to the eye to be examined, and after the initial correction value of the correction means is set, the response input is performed in which the test subject inputs an answer for interpreting the test optotype. The subjective measurement is automatically proceeded based on the input signal from the means. For example, in so-called self-optometry, in which the subject performs the subjective measurement himself, it is not possible to easily match the second distance in the subjective measurement to the first distance in the objective measurement. For this reason, the first distance and the second distance do not match at the start of the subjective measurement, and the measurement progresses with correction made using different eye refractive powers, which may result in an extended measurement time. Possible gender. However, as in this embodiment, when the first distance and the second distance are different, the first objective eye refractive power based on the first distance is converted into the second objective eye refractive power based on the second distance. Even in self-eye examination, the eye to be examined can be correctly corrected with a predetermined eye refractive power, and subjective measurement can be performed smoothly.

In addition, in this example, a first objective value based on the first distance V1 is converted into a second objective value based on the second distance V2 in a subjective optometry device that subjectively measures the eye refractive power of the eye to be examined. Although the configuration has been described as an example, the present invention is not limited to this. For example, an objective optometrist that objectively measures the eye refractive power of the eye to be examined may be configured to convert a first objective value into a second objective value. In this case, by measuring the first objective value of the first distance V1 with the objective optometry device and receiving the second distance V2 from the subjective optometry device, the objective optometry device measures the first objective value of the first distance V1. The objective value may be converted into a second objective value.

Reference Signs List 1 Subjective optometry device 11 Confirmation window 12 Observation window 30 Suppression unit 40 Light source 50 Eye refractive power measurement unit 51 Forehead rest 53 Examination window 55 Lens chamber unit 60 Visual target presentation section 70 Control section 100 Objective eye refraction power measurement device 200 Consciousness type optometry device

Claims (7)

An optometry device that subjectively measures the ocular refractive power of the eye to be examined, comprising an optotype presenting means that emits an optotype light beam toward the eye to be examined, and a correction means that changes the optical characteristics of the eyepiece light beam. And,
objective eye refractive power acquisition means for acquiring objective eye refractive power in the objective measurement of the subject's eye;
a first distance acquisition means for acquiring a first distance from the corneal apex of the eye to be examined to a reference lens wearing position in the objective measurement of the eye to be examined;
a second distance acquisition means for acquiring a second distance from the corneal apex of the eye to be examined to a reference lens wearing position in the subjective measurement of the eye to be examined;
Conversion means for converting a first objective eye refractive power based on the first distance into a second objective eye refractive power based on the second distance when the first distance and the second distance are different;
output means for outputting the second objective eye refractive power;
An optometry device comprising: The optometry device according to claim 1,
An optometry apparatus comprising a correction control means for setting an initial correction value of the correction means based on the second objective eye refractive power output from the output means. The optometry device according to claim 1 or 2,
The conversion means converts the first objective eye refractive power into the second objective eye refractive power when the first distance and the second distance are different and the first objective eye refractive power exceeds a predetermined threshold value. An optometry device characterized by converting visual refractive power into visual refractive power. The optometry device according to any one of claims 1 to 3,
comprising a detection means for detecting the second distance in the subjective measurement of the eye to be examined;
The optometry apparatus is characterized in that the second distance acquisition means acquires the second distance based on the detection result of the detection means. In the optometry device according to any one of claims 2 to 4,
optotype presenting means for presenting a test optotype to the eye to be examined;
a response input means for inputting a response by the subject to decipher the test optotype;
After the initial correction value of the correction means is set by the correction control means, a control means for automatically proceeding with the subjective measurement based on an input signal from the response input means;
An optometry device comprising: An optometry device that subjectively measures the ocular refractive power of the eye to be examined, comprising an optotype presenting means that emits an optotype light beam toward the eye to be examined, and a correction means that changes the optical characteristics of the eyepiece light beam. An optometry program used in
being executed by the processor of the optometry device;
an objective eye refractive power acquisition step of acquiring objective eye refractive power in the objective measurement of the subject's eye;
a first distance acquisition step of acquiring a first distance from the corneal apex of the eye to be examined to a reference lens wearing position in the objective measurement of the eye to be examined;
a second distance acquisition step of acquiring a second distance from the corneal apex of the eye to be examined to a reference lens wearing position in the subjective measurement of the eye to be examined;
a conversion step of converting a first objective eye refractive power based on the first distance into a second objective eye refractive power based on the second distance when the first distance and the second distance are different;
an output step of outputting the second objective eye refractive power;
An optometry program that causes the optometrist to execute the following. An optometry device that measures the eye refractive power of an eye to be examined,
objective eye refractive power acquisition means for acquiring objective eye refractive power in the objective measurement of the subject's eye;
a first distance acquisition means for acquiring a first distance from the corneal apex of the eye to be examined to a reference lens wearing position in the objective measurement of the eye to be examined;
a second distance acquisition means for acquiring a second distance from the corneal apex of the eye to be examined to a reference lens wearing position in the subjective measurement of the eye to be examined;
Conversion means for converting a first objective eye refractive power based on the first distance into a second objective eye refractive power based on the second distance when the first distance and the second distance are different;
output means for outputting the second objective eye refractive power;
An optometry device comprising: