Subjective optometric device and subjective optometric program

Abstract

To provide a subjective optometric device and a subjective optometric program capable of easily acquiring adjustment information on an eye to be examined.SOLUTION: A subjective optometric device includes: presentation distance setting means for controlling the drive of target presentation means for presenting a target to an eye to be examined, and setting a presentation distance to any distance from the myopic distance to the intermediate distance of the eye to be examined; subjective measuring means for subjectively measuring optical characteristics of the eye to be examined; objective measuring means for objectively measuring optical characteristics of the eye to be examined; correction control means for controlling correction means, and alternately setting a first correction degree for changing refractive power to a negative side and a second correction degree for changing the refractive power to a positive side for the eye to be examined in a state that the presentation distance setting means has set the presentation distance; adjustment information acquisition means for acquiring adjustment information on the eye to be examined on the result of the measurement by the objective measuring means when the correction control means repeats settings of the first correction degree and the second correction degree; and output mean for outputting the adjustment information acquired by the adjustment information acquisition means.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a subjective optometry device and a subjective optometry program for subjectively measuring optical characteristics of a subject's eye. [Background technology]

[0002] There is known a subjective optometry device that subjectively measures the optical characteristics of a subject's eye. For example, a subjective optometry device projects a visual target light beam toward the subject's eye and switches the correction power for correcting the subject's eye, thereby subjectively measuring the optical characteristics of the subject's eye (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-086652 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the subjective eye examination, accommodation information of the subject's eye may be obtained. For example, as one method of obtaining accommodation information of the subject's eye, a flipper test is known, which measures whether the accommodation response of the subject's eye is performed smoothly in response to a sudden change in accommodation stimulus. For example, the flipper test is performed by presenting a visual target with a flipper lens placed in front of the subject's eye, and the examiner flips the flipper lens based on the subject's answer on recognizing the visual target. However, in addition to flipping the flipper lens, the examiner must perform many tasks, such as measuring the time from flipping the flipper lens to obtaining an answer and recording the results, which is time-consuming.

[0005] In view of the above problems, the present disclosure has as its technical object to provide a subjective optometry device and a subjective optometry program that can easily acquire accommodation information of a subject's eye. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention is characterized by having the following configuration. (1) A subjective ophthalmology device according to a first aspect of the present disclosure is a subjective ophthalmology device that subjectively measures optical characteristics of a subject's eye, and includes a presentation distance setting means that controls the drive of an optotype presenting means that presents an optotype to the subject's eye, and sets a presentation distance of the optotype relative to the subject's eye to any distance between the near distance and the intermediate distance of the subject's eye, and a correction means that changes optical characteristics of an optotype light beam emitted from the optotype presenting means, and a subjective measurement means that subjectively measures the optical characteristics of the subject's eye, and a measurement light beam that projects a measurement light beam onto the fundus of the subject's eye and receives a reflected light beam of the measurement light beam reflected by the fundus, thereby objectively measuring the optical characteristics of the subject's eye. the correction control means, when the presentation distance setting means has set the presentation distance, controlling the correction means to alternately set, for the test eye, a first correction power for changing the refractive power by a predetermined degree on the negative side and a second correction power for changing the refractive power by the predetermined degree on the positive side; accommodation information acquisition means for acquiring accommodation information of the test eye based on the measurement results of the objective measurement means when the correction control means has repeatedly set the first correction power and the second correction power; and output means for outputting the accommodation information acquired by the accommodation information acquisition means. (2) A subjective eye examination program according to a second aspect of the present disclosure includes a subjective measurement means having a correction means for changing the optical characteristics of a target light beam emitted from a target presenting means and for subjectively measuring the optical characteristics of the eye to be examined, and an objective measurement means for projecting a measurement light beam onto a fundus of the eye to be examined and receiving a reflected light beam of the measurement light beam reflected by the fundus, thereby objectively measuring the optical characteristics of the eye to be examined. The subjective eye examination program is used in a subjective eye examination device for subjectively measuring the optical characteristics of the eye to be examined, and is executed by a processor of the subjective eye examination device to control driving of a target presenting means for presenting a target to the eye to change the presentation distance of the target to any one of a near distance to an intermediate distance of the eye to be examined. a correction control step of controlling the corrective means while the presentation distance is set in the presentation distance setting step, and alternately setting, for the test eye, a first correction power for changing the refractive power by a predetermined power on the negative side and a second correction power for changing the refractive power by the predetermined power on the positive side; an accommodation information acquisition step of acquiring accommodation information of the test eye based on the measurement results of the objective measurement means when the first correction power and the second correction power are repeatedly set in the correction control step; and an output step of outputting the accommodation information acquired in the accommodation information acquisition step. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is an external view of an optometric apparatus. [Diagram 2] FIG. 13 is a diagram showing a measurement unit for the left eye. [Diagram 3] 1 is a schematic configuration diagram of the inside of an optometry apparatus as viewed from the front. [Figure 4] 2 is a schematic configuration diagram of the inside of the optometry apparatus as viewed from the side. FIG. [Diagram 5] 2 is a schematic configuration diagram of the inside of the optometry apparatus as viewed from above. FIG. [Figure 6] FIG. 2 is a diagram showing a control system of the optometric apparatus. [Figure 7]FIG. 11 is a flowchart showing a flow of acquiring accommodation information using an optometry apparatus. [Figure 8] 1 is a diagram for explaining the state of accommodation of a test eye with respect to a change in the presentation distance of a visual target. [Figure 9] FIG. 2 is a diagram for explaining the state of accommodation of the subject's eye. [Figure 10] 13 is an example of an operation screen. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] <Summary> An overview of a subjective optometry device according to an embodiment of the present disclosure will be described. The items classified in <> below can be used independently or in conjunction with each other.

[0009] The subjective optometry device in this embodiment subjectively measures the optical characteristics of the subject's eye. For example, the optical characteristics of the subject's eye may be at least one of the ocular refractive power (e.g., spherical power, cylindrical power, astigmatism axis angle, etc.), contrast sensitivity, and binocular vision function (e.g., heterophoria amount, stereoscopic vision function, etc.) of the subject's eye.

[0010] The subjective optometry apparatus in this embodiment acquires accommodation information of the subject's eye. For example, the accommodation information of the subject's eye may be acquired by performing a so-called flipper test to measure the accommodation response of the subject's eye. For example, the flipper test is a test to measure whether or not the accommodation response is performed smoothly in response to a sudden change in accommodation stimulus.

[0011] For example, in the conventional flipper test, the examiner uses a flipper lens to alternately place plus and minus lenses of the same power but different signs in front of the subject's eye, thereby providing accommodation stimulation. For example, at this time, the examiner switches between the plus and minus lenses depending on the subject's subjective response as to whether or not he or she has recognized the target. On the other hand, for example, in the subjective optometry device of this embodiment, accommodation stimulation may be provided by alternately setting the same power but different signs to the subject's eye and adding a correction power to the subject's eye. For example, this allows automatic addition of a correction power equivalent to the examiner's switching between a plus lens and a minus lens.

[0012] However, in the case of the subjective optometry device having such a configuration, the examiner cannot determine the timing of providing the accommodation stimulus to the eye to be examined unless the examinee answers whether or not the subject recognizes the optotype. Therefore, in the subjective optometry device of this embodiment, the corrective power added to the eye to be examined may be changed by obtaining the subject's objective answer instead of the subjective answer, and the timing of providing the accommodation stimulus may be automatically set. More specifically, for example, the timing of providing the accommodation stimulus may be appropriately set by objectively determining whether or not the examinee recognizes the optotype based on the measurement result obtained by measuring the optical characteristics of the eye to be examined using an objective measuring means described later. In this case, the measurement accuracy of the eye to be examined can be kept constant, and the burden on the examiner can be reduced.

[0013] <Means for presenting visual targets> The subjective eye examination device in this embodiment may include a target presenting means. The target presenting means emits a target light beam toward the subject's eye to present a target to the subject's eye. For example, the target presenting means may be a display (for example, the display 31). Alternatively, for example, the target presenting means may be a light source and a DMD (Digital Micromirror Device). Alternatively, for example, the target presenting means may be a light source and a target plate.

[0014] For example, the target light beam from the target presenting means may be directly emitted toward the eye to be examined. Also, for example, the target light beam from the target presenting means may be indirectly guided toward the eye to be examined via a light projecting optical system (for example, the light projecting optical system 30). For example, the light projecting optical system may have at least one optical member through which the target light beam emitted from the target presenting means passes. As an example, it may have at least one of a lens, a mirror, and the like.

[0015] <Presentation distance setting means> The subjective eye examination device in this embodiment may include a presentation distance setting means (for example, a control unit 70). The presentation distance setting means controls the driving of an optotype presenting means for presenting an optotype to the subject's eye, and sets the presentation distance of the optotype to the subject's eye to any distance between the near distance and the intermediate distance of the subject's eye. For example, the near distance of the subject's eye may be a distance at which the subject focuses when performing near work (for example, reading, desk work, etc.). For example, the near distance may be a distance of 30 cm to 1 m. For example, the intermediate distance of the subject's eye may be a distance at which the subject focuses when performing intermediate work (for example, watching television). For example, the intermediate distance may be a distance of 1 m to 3 m.

[0016] <Subjective measurement method> The subjective optometry device in this embodiment may include a subjective measurement means (e.g., a control unit 70). The subjective measurement means subjectively measures the optical characteristics of the subject's eye. For example, the subjective measurement means may include a correction means as a part of the configuration of the subjective measurement means.

[0017] <Correction means> The correction means changes the optical characteristics of the visual target light beam emitted from the visual target presenting means. For example, the correction means may include a correction optical system (e.g., a light projecting optical system 30, a correction optical system 60) as a part of the configuration of the correction means. For example, the correction optical system is disposed in the optical path of the light projecting optical system, and changes the optical characteristics of the visual target light beam. For example, the optical characteristics of the visual target light beam may be at least one of the spherical power, cylindrical power, and astigmatism axis angle of the visual target light beam.

[0018] For example, the correction optical system may be configured to be able to change the optical characteristics of the visual target light beam. For example, the correction optical system may be able to change the optical characteristics of the visual target light beam by controlling an optical element. The optical element may be at least one of a spherical lens, a cylindrical lens, a cross cylinder lens, a rotary prism, a wavefront modulation element, a variable focus lens, and the like. Of course, an optical element different from these optical elements may also be used.

[0019] Also, for example, the correction optical system may correct the spherical power of the subject's eye by optically changing the presentation distance of the optotype relative to the subject's eye. In this case, the optotype presenting means may be moved in the optical axis direction in order to optically change the presentation distance of the optotype. In this case, the optical element (e.g., a spherical lens, etc.) arranged in the optical path may be moved in the optical axis direction in order to optically change the presentation distance of the optotype.

[0020] In addition, the corrective optical system may be configured by combining a configuration for controlling an optical element, a configuration for moving a visual target presenting means in the optical axis direction, and a configuration for moving an optical element arranged in the optical path in the optical axis direction.

[0021] In this embodiment, the correction optical system may be an eye refraction measuring unit (phoropter) that arranges an optical element in front of the eye to be examined. For example, the eye refraction measuring unit may have a variable focus lens and change the refractive power of the variable focus lens. Also, for example, the eye refraction measuring unit may have a lens disk on which a plurality of optical elements are arranged on the same circumference, and a driving means (e.g., a motor) for rotating the lens disk, and the optical elements may be electrically switched by driving the driving means. Of course, the eye refraction measuring unit may have a variable focus lens, a lens disk, and a driving means. When these configurations are provided, the visual target light beam toward the eye to be examined is projected via the eye refraction measuring unit.

[0022] In addition, in this embodiment, the correction optical system may be configured to change the optical characteristics of the visual target light beam by controlling an optical element disposed between a visual target presenting means included in the light projection optical system and an optical member for guiding the visual target light beam emitted from the visual target presenting means to the subject's eye. That is, the correction optical system may be configured as a phantom lens refractometer (phantom correction optical system). In this case, the visual target light beam corrected by the correction optical system is guided to the subject's eye via the optical member.

[0023] <Objective measurement means> The subjective ophthalmology device in this embodiment may include an objective measuring means (e.g., a control unit 70). The objective measuring means objectively measures the optical characteristics of the subject's eye. As an example, the objective measuring means may objectively measure the ocular refractive power of the subject's eye (e.g., spherical power, cylindrical power, astigmatism axis angle, etc.). For example, the objective measuring means may have an objective measuring optical system (e.g., the objective measuring optical system 10) as a part of the configuration of the objective measuring means. The objective measuring optical system projects a measuring light beam onto the fundus of the subject's eye and receives the reflected measuring light beam reflected by the fundus. For example, the objective measuring optical system may obtain a fundus reflected light beam image (e.g., a ring image) by receiving the reflected light beam from the fundus.

[0024] The subjective optometry device in this embodiment may be equipped with a pair of left and right eye measuring means, which is a measuring means having the above-mentioned subjective measuring means and objective measuring means. That is, it may be equipped with a left eye measuring means including a subjective measuring optical system and an objective measuring optical system for the left eye, and a right eye measuring means including a subjective measuring optical system and an objective measuring optical system for the right eye. In addition, by having a pair of left and right eye measuring means and a right eye measuring means, the subjective optometry device can project a visual target light beam from the left eye measuring means to the left eye and a visual target light beam from the right eye measuring means to the right eye. This enables binocular fusion by the left eye and the right eye.

[0025] <Correction control means> The subjective eye examination device in this embodiment may include a correction control means (for example, a control unit 70). The correction control means controls the correction means in a state in which the presentation distance setting means has set the presentation distance, and alternately sets, for the subject's eye, a first correction power for changing the refractive power by a predetermined degree on the negative side and a second correction power for changing the refractive power by a predetermined degree on the positive side.

[0026] For example, the correction control means may alternately set the first correction power and the second correction power when the subject's eye is in a naked eye state. Also, for example, the correction control means may alternately set the first correction power and the second correction power when the subject's eye is corrected to a predetermined correction power. For example, the predetermined correction power of the subject's eye may be an optical characteristic (subjective value) obtained by subjectively measuring the subject's eye, or may be an optical characteristic (objective value) obtained by objectively measuring the subject's eye.

[0027] For example, the correction control means may alternately set the first correction power and the second correction power for either the left eye or the right eye of the subject. Also, for example, the correction control means may alternately set the first correction power and the second correction power for both the left eye and the right eye of the subject.

[0028] For example, the first correction power may be a correction power for providing a change in accommodation stimulus on the negative side by a sudden change in power for the eye to be examined. For example, it may be at least one of -2.00D, -1.50D, -1.00D, etc. For example, the second correction power may be a correction power for providing a change in accommodation stimulus on the positive side by a sudden change in power for the eye to be examined. For example, it may be at least one of +2.00D, +1.50D, +1.00D, etc. For example, the first correction power and the second correction power are the same power but with different signs. For example, this allows for an accommodation change from the first correction power to the second correction power (for example, an accommodation change from -2.00D to +2.00D) when the first correction power and the second correction power are set alternately. Note that, for example, in this case, the first correction power and the second correction power may be fixed values ​​set in advance based on experiments or simulations, or may be any values ​​set by the examiner.

[0029] For example, the correction control means may invert the first and second corrective powers from one to the other when it is determined by a determination means described later that the subject's eye recognizes the optotype. More specifically, for example, the correction control means may invert the first corrective power to the second corrective power based on the measurement result of the subject's eye by the objective measurement means after applying the first corrective power to the subject's eye, and may invert the second corrective power to the first corrective power based on the measurement result of the subject's eye by the objective measurement means after applying the second corrective power to the subject's eye.

[0030] <Judgment means> The subjective eye examination device of this embodiment may include a determination means (e.g., a control unit 70). The determination means determines whether or not the subject's eye recognizes an optotype based on the measurement result of the subject's eye by the objective measurement means. For example, this makes it possible to obtain accommodation information of the subject's eye with high accuracy. As an example, it is possible to maintain the measurement accuracy of the flipper test on the subject's eye.

[0031] For example, the determination means may use a fundus reflection light beam image received by an objective measurement optical system as a measurement result of the subject's eye by the objective measurement means. For example, in this case, the determination means may determine that the subject's eye has recognized the visual target when the fundus reflection light beam image is the same (or substantially the same) as a predetermined reference size. Also, for example, the determination means may determine that the subject's eye has not recognized the visual target when the fundus reflection light beam image is a size different from the predetermined reference size.

[0032] For example, the determination means may use an objective value obtained by analyzing the fundus reflection light beam image described above as a measurement result of the objective measurement means of the subject's eye. For example, in this case, the determination means may determine that the subject's eye recognizes the optotype when the objective value is the same (almost the same) as a predetermined reference value. Also, for example, the determination means may determine that the subject's eye does not recognize the optotype when the objective value is a value different from the predetermined reference value.

[0033] For example, the determination means may determine whether the test eye recognizes the target by determining whether the measurement result of the objective measurement means of the test eye is within an allowable range indicating that the test eye recognizes the target. For example, such an allowable range may be set for a predetermined reference size in the fundus reflection light beam image or a predetermined reference value in the objective value. Also, for example, such an allowable range may be a fixed value set in advance based on an experiment or simulation, or may be an arbitrary value set by the examiner. For example, by appropriately setting an allowable range indicating the test eye's recognition of the target, the measurement for obtaining accommodation information of the test eye can be carried out more smoothly.

[0034] <Adjustment information acquisition means> The subjective eye examination device of this embodiment may include an accommodation information acquisition means (e.g., a control unit 70). The accommodation information acquisition means acquires accommodation information of the examinee's eye based on the measurement results of the objective measurement means when the correction control means repeats the setting of the first correction power and the second correction power. For example, this makes it possible to easily acquire accommodation information of the examinee's eye. As an example, it reduces the work of the examiner inverting the flipper lens and adding the same correction power with a different sign to the examinee's eye, as in the conventional case.

[0035] For example, the accommodation information acquiring means may acquire information on the accommodation function of the subject's eye as the accommodation information of the subject's eye. As an example, the accommodation function may be at least one of accommodation efficiency, speed of accommodation response, difference between strong accommodation and weak accommodation, degree of accommodation intervention, etc. Of course, it may include other things than these.

[0036] The accommodation efficiency is a ratio at which accommodation can smoothly respond to a change in accommodation stimulus, and may be calculated based on the number of times the target can be recognized each time the first and second corrective powers are inverted within a certain time period. Also, for example, the speed of accommodation response may be expressed by the elapsed time required for the test eye to recognize the target in response to the inversion of the first and second corrective powers.

[0037] For example, the accommodation information acquiring means may acquire, as the accommodation information of the examinee's eye, the number of times that the first and second corrective powers for the examinee's eye are inverted within a predetermined time. For example, the predetermined time for the inversion of the first and second corrective powers may be a time until a tendency of accommodation function appears, or a time during which accommodation function can be acquired. As an example, the predetermined time may be a time used in a normal flipper test (for example, 60 seconds), or the examiner may be able to set any time.

[0038] <Output method> The subjective eye examination device of this embodiment includes an output means (for example, a control unit 70). The output means outputs the adjustment information acquired by the adjustment information acquisition means. For example, the output means may control the display means to display the adjustment information on the display means. Also, for example, the output means may control the sound generation means (for example, a speaker) to generate the adjustment information as sound on the sound generation means. Also, for example, the output means may control the notification means (for example, a lamp) to indicate the adjustment information by lighting or blinking the notification means. Also, for example, the output means may control the printing means (for example, a printer) to cause the printing means to print the adjustment information. Also, for example, the output means may control an external storage means (for example, a memory or a server) to transmit the adjustment information to the external storage means. Of course, for example, the output means may execute a combination of these controls, or may execute a control different from these controls.

[0039] The present disclosure is not limited to the device described in the present embodiment. For example, the terminal control software (program) performing the functions of the above embodiment can be supplied to a device or a system via a network or various storage media, and a control device (e.g., a CPU) of the device or the system can read and execute the program.

[0040] <Example> An example of a subjective optometry apparatus (hereinafter, optometry apparatus) according to this embodiment will be described.

[0041] FIG. 1 is an external view of an optometry apparatus 100. For example, the optometry apparatus 100 includes a housing 2, a presentation window 3, a forehead rest 4, a chin rest 5, a controller 6, an imaging unit 90, and the like. The housing 2 includes a measurement unit 7, a deflection mirror 81, a reflection mirror 84, a concave mirror 85, and the like inside. The presentation window 3 is used to present a visual target to the eye E to be examined. The forehead rest 4 and the chin rest 5 are used to keep the distance between the eye E to be examined and the optometry apparatus 1 constant. The controller 6 includes a monitor 6a, a switch unit 6b, and the like. The monitor 6a displays various information (e.g., measurement results of the eye to be examined, etc.). The monitor 6a may be a touch panel that also functions as the switch unit 6b. The switch unit 6b is used to perform various settings (e.g., input of a start signal, etc.). A signal corresponding to an operation instruction from the controller 6 is output to the control unit 70 by wired communication or wireless communication.

[0042] The imaging unit 90 is used to capture an image of the face of the subject and adjust the position of the subject's eye in the Y direction. The imaging unit 90 includes an imaging optical system (not shown). For example, the imaging optical system may be composed of an imaging element and a lens.

[0043] <Measurement part> The measurement unit 7 includes a left eye measurement unit 7L and a right eye measurement unit 7R. The left eye measurement unit 7L and the right eye measurement unit 7R are configured from the same material. Of course, the left eye measurement unit 7L and the right eye measurement unit 7R may be configured from at least a part of different materials. The measurement unit 7 has a pair of left and right subjective measurement units and a pair of left and right objective measurement units (details will be described later). The target light beam and the measurement light beam from the measurement unit 7 are guided to the subject's eye E through the presentation window 3.

[0044] 2 is a diagram showing the left eye measurement unit 7L. The right eye measurement unit 7R has the same configuration as the left eye measurement unit 7L, so it is omitted. For example, the left eye measurement unit 7L includes an objective measurement optical system 10, a subjective measurement optical system 25, a first target projection optical system 45, a second target projection optical system 46, an observation optical system 50, etc.

[0045] <Objective measurement optical system> The objective measuring optical system 10 is used as a part of an objective measuring unit that objectively measures the optical characteristics of the subject's eye E. In this embodiment, the ocular refractive power of the subject's eye E is measured as the optical characteristic of the subject's eye E. For example, the objective measuring optical system 10 is composed of a projection optical system 10a and a light receiving optical system 10b.

[0046] The projection optical system 10a projects a spot-shaped measurement target onto the fundus of the subject's eye E through the center of the pupil of the subject's eye E. For example, the projection optical system 10a includes a light source 11, a relay lens 12, a hole mirror 13, a prism 15, an objective lens 93, a dichroic mirror 35, a dichroic mirror 29, and the like. The light source 11 emits a measurement light beam. The light source 11 is conjugate with the fundus of the subject's eye E. The hole of the hole mirror 13 is conjugate with the pupil of the subject's eye E. The prism 15 is a light beam deflecting member. The prism 15 is disposed at a position away from the position conjugate with the pupil of the subject's eye E, and decenters the measurement light beam passing through the prism 15 with respect to the optical axis L1. The prism 15 is driven to rotate around the optical axis L1 by a drive unit (motor) 23. The dichroic mirror 35 makes the optical path of the objective measurement optical system 10 and the optical path of the subjective measurement optical system 25 a common optical path. In other words, the optical axis L1 of the objective measurement optical system 10 and the optical axis L2 of the subjective measurement optical system 25 are coaxial. The dichroic mirror 29 is an optical path branching member. The dichroic mirror 29 reflects the measurement light beam from the projection optical system 10a and the target light beam from the projection optical system 30 (described later) and guides them to the subject's eye E.

[0047] The light receiving optical system 10b extracts the fundus reflected light beam reflected by the fundus of the subject's eye E in a ring shape through the pupil periphery of the subject's eye E. For example, the light receiving optical system 10b includes a dichroic mirror 29, a dichroic mirror 35, an objective lens 93, a prism 15, a hole mirror 13, a relay lens 16, a mirror 17, a light receiving aperture 18, a collimator lens 19, a ring lens 20, an image sensor 22, and the like. The ring lens 20 is composed of a lens portion formed in a ring shape and a light shielding portion in which a light shielding coating is applied to an area other than the lens portion. The ring lens 20 is in a positional relationship optically conjugate with the pupil of the subject's eye E. The light receiving aperture 18 and the image sensor 22 are in a conjugate relationship with the fundus of the subject's eye E. The output from the image sensor 22 is input to the control unit 70.

[0048] In this embodiment, the prism 15 is disposed on a common optical axis of the projection optical system 10a and the light receiving optical system 10b. For example, the measurement light beam from the projection optical system 10a passes through the prism 15 and enters the subject's eye E, and the fundus reflected light beam reflected by the fundus of the subject's eye E passes through the same prism 15. Therefore, in the subsequent optical systems, the projection light beam and the fundus reflected light beam (received light beam) are scanned inversely as if there was no decentering of the projection light beam and the fundus reflected light beam (received light beam) on the pupil.

[0049] <Subjective Measuring Optical System> The subjective measurement optical system 25 is used as a part of a subjective measurement unit that subjectively measures the optical characteristics of the subject's eye E. In this embodiment, the ocular refractive power of the subject's eye E is measured as the optical characteristics of the subject's eye E. For example, the subjective measurement optical system 25 is composed of a light projection optical system 30 and a correction optical system 60.

[0050] <Projection optical system> The light projection optical system 30 projects a visual target light flux toward the subject's eye E. For example, the light projection optical system 30 includes a display 31, a light projection lens 33, a light projection lens 34, a reflecting mirror 36, an objective lens 92, a dichroic mirror 35, a dichroic mirror 29, etc. A visual target (a fixation target, a test visual target, etc.) is displayed on the display 31.

[0051] <Correction optical system> The correction optical system 60 is disposed in the optical path of the projection optical system 30. The correction optical system 60 changes the optical characteristics of the visual target light beam emitted from the display 31. For example, the correction optical system 60 includes an astigmatism correction optical system 63, a driving mechanism 39, and the like. The astigmatism correction optical system 63 is used to correct the cylindrical power and astigmatism axis angle of the subject's eye E. The astigmatism correction optical system 63 is disposed between the projection lens 33 and the projection lens 34. The astigmatism correction optical system 63 is composed of two positive cylindrical lenses 61a and 61b having the same focal length. The cylindrical lenses 61a and 61b are independently rotated around the optical axis L2 by the driving of the rotation mechanisms 62a and 62b.

[0052] In this embodiment, the cylindrical lens 61a and the cylindrical lens 61b are used as the astigmatism correcting optical system 63, but the present invention is not limited to this. The astigmatism correcting optical system 63 may be configured to correct the cylindrical power, the astigmatism axis angle, etc. As an example, a corrective lens may be inserted into or removed from the optical path of the projection optical system 30.

[0053] The light source 11 and relay lens 12 included in the projection optical system 10a, the light receiving diaphragm 18, collimator lens 19, ring lens 20, and image sensor 22 included in the light receiving optical system 10b, and the display 31 included in the light projection optical system 30 can be moved integrally in the optical axis direction by a drive mechanism 39. In other words, the display 31, light source 11, relay lens 12, light receiving diaphragm 18, collimator lens 19, ring lens 20, and image sensor 22 are synchronized as a drive unit 95, and are moved integrally by the drive mechanism 39. The drive mechanism 39 is composed of a motor and a slide mechanism.

[0054] The driving mechanism 39 moves the display 31 in the direction of the optical axis L2 by moving the driving unit 95 in the direction of the optical axis. This allows the subject's eye E to be clouded in the objective measurement. In the subjective measurement, the presentation distance of the optotype to the subject's eye E can be optically changed to correct the spherical power of the subject's eye E. That is, the configuration for moving the display 31 in the direction of the optical axis L2 is used as a spherical correction optical system for correcting the spherical power of the subject's eye E, and the spherical power of the subject's eye E is corrected by changing the position of the display 31. The configuration of the spherical correction optical system may be different from that of this embodiment. For example, the spherical power may be corrected by arranging a number of optical elements in the optical path. Also, for example, the spherical power may be corrected by arranging a lens in the optical path and moving the lens in the direction of the optical axis.

[0055] Further, the driving mechanism 39 moves the driving unit 95 in the optical axis direction, thereby moving the light source 11, the relay lens 12, and the image sensor 22 from the light receiving aperture 18 in the optical axis L1 direction. As a result, the light source 11, the light receiving aperture 18, and the image sensor 22 are arranged so as to be optically conjugate with the fundus of the subject's eye E. Regardless of the movement of the driving unit 95, the hole mirror 13 and the ring lens 20 are arranged so as to be conjugate with the pupil of the subject's eye E at a constant magnification. Therefore, the fundus reflected light beam, which is the measurement light beam of the projection optical system 10a, is always incident on the ring lens 20 of the light receiving optical system 10b as a parallel light beam, and a ring-shaped light beam of the same size as the ring lens 20 is imaged by the image sensor 22 in a focused state, regardless of the ocular refractive power of the subject's eye E.

[0056] <First target projection optical system and second target projection optical system> The first target projection optical system 45 and the second target projection optical system 46 are disposed between the dichroic mirror 29 and a deflection mirror 81 (described later). The first target projection optical system 45 emits near-infrared light for projecting an alignment target at infinity onto the cornea of ​​the subject's eye E. The second target projection optical system 46 is disposed at a position different from the first target projection optical system 45, and emits near-infrared light for projecting an alignment target at finite distance onto the cornea of ​​the subject's eye. The near-infrared light (alignment light) emitted from the second target projection optical system 46 is also used as anterior eye imaging light for imaging the anterior eye of the subject's eye by the observation optical system 50.

[0057] <Observation optical system> The observation optical system (imaging optical system) 50 includes a dichroic mirror 29, an objective lens 103, an imaging lens 51, an imaging element 52, etc. The dichroic mirror 29 transmits the anterior eye observation light and the alignment light. The imaging element 52 has an imaging surface arranged at a position conjugate with the anterior eye of the subject's eye E. The output from the imaging element 52 is input to the control unit 70. As a result, an anterior eye image of the subject's eye E is captured by the imaging element 52 and displayed on the monitor 6a. The observation optical system 50 also serves as an optical system for detecting an alignment index image formed on the cornea of ​​the subject's eye E by the first index projecting optical system 45 and the second index projecting optical system 46, and the position of the alignment index image is detected by the control unit 70.

[0058] <Internal structure of the optometry device> The internal configuration of the optometry apparatus 100 will be described. Fig. 3 is a schematic diagram of the inside of the optometry apparatus 100 as viewed from the front. Fig. 4 is a schematic diagram of the inside of the optometry apparatus 100 as viewed from the side. Fig. 5 is a schematic diagram of the inside of the optometry apparatus 100 as viewed from above. For ease of explanation, Figs. 4 and 5 only show the optical axis of the left eye measurement unit 7L.

[0059] The optometry apparatus 100 includes an objective measurement unit. For example, the objective measurement unit includes a measurement unit 7, a deflection mirror 81, a reflection mirror 84, a concave mirror 85, and the like. The optometry apparatus 100 also includes a subjective measurement unit. For example, the subjective measurement unit includes a measurement unit 7, a deflection mirror 81, a reflection mirror 84, a concave mirror 85, and the like. The objective measurement unit and the subjective measurement unit are not limited to this configuration. For example, the configuration may not include the reflection mirror 84. In this case, the light beam from the measurement unit 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. In addition, for example, the configuration may include a half mirror. In this case, the light beam from the measurement unit 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 through the half mirror.

[0060] For example, the deflection mirror 81 has a left-eye deflection mirror 81L and a right-eye deflection mirror 81R that are provided in a pair on the left and right sides. For example, the deflection mirror 81 is disposed between the correction optical system 60 and the subject's eye E. That is, the correction optical system 60 in this embodiment has a left-eye corrective optical system and a right-eye corrective optical system that are provided in a pair on the left and right sides, and the left-eye deflection mirror 81L is disposed between the left-eye corrective optical system and the left eye EL, and the right-eye deflection mirror 81R is disposed between the right-eye corrective optical system and the right eye ER. For example, the deflection mirror 81 is preferably disposed at a pupil conjugate position.

[0061] For example, the left-eye deflection mirror 81L reflects the light beam projected from the left-eye measurement unit 7L and guides it to the left eye EL. Also, for example, the left-eye deflection mirror 81L reflects the fundus reflection light beam from the left eye EL and guides it to the left-eye measurement unit 7L. For example, the right-eye deflection mirror 81R reflects the light beam projected from the right-eye measurement unit 7R and guides it to the right eye ER. Also, for example, the right-eye deflection mirror 81R reflects the fundus reflection light beam from the right eye ER and guides it to the right-eye measurement unit 7R.

[0062] For example, the deflection mirror 81 is rotationally moved by the drive unit 82. For example, the rotational movement of the deflection mirror 81 can deflect an apparent light beam for forming an image of the visual target light beam in front of the subject's eye, and optically correct the formation position of the image of the visual target light beam. For example, the drive unit 82 is composed of a motor or the like. For example, the drive unit 82 rotates the deflection mirror 81 about a rotation axis in the horizontal direction (X direction) and a rotation axis in the vertical direction (Y direction). That is, the drive unit 82 rotates the deflection mirror 81 in the XY direction. Note that the rotation of the deflection mirror 81 may be either the horizontal direction or the vertical direction. For example, the drive unit 82 has a drive unit 82L for driving the left-eye deflection mirror 81L and a drive unit 82R for driving the right-eye deflection mirror 81R.

[0063] In this embodiment, the configuration using the deflection mirror 81 as the deflection member that reflects and guides the light beam projected from the measurement unit 7 to the subject's eye E has been described as an example, but the present invention is not limited to this. The deflection member may be a prism, a lens, or the like as long as it can reflect and guide the light beam projected from the measurement unit 7 to the subject's eye E.

[0064] Also, for example, a plurality of deflection mirrors 81 may be provided in each of the optical path for the left eye and the optical path for the right eye. For example, a configuration in which two deflection mirrors are provided in each of the optical path for the left eye and the optical path for the right eye (for example, a configuration in which two deflection mirrors are provided in the optical path for the left eye, etc.) can be mentioned. In this case, one deflection mirror may be rotated in the X direction, and the other deflection mirror may be rotated in the Y direction. For example, by rotating and moving the deflection mirror 81, it is possible to deflect the apparent light beam for forming an image of the visual target light beam in front of the subject's eye, and optically correct the formation position of the image of the visual target light beam.

[0065] For example, the concave mirror 85 guides the visual target light beam that has passed through the correction optical system 60 to the subject's eye E, and forms an image of the visual target light beam that has passed through the correction optical system 60 in front of the subject's eye E. For example, the concave mirror 85 is shared by the left eye measurement unit 7L and the right eye measurement unit 7R. For example, the concave mirror 85 is shared by the left eye optical path including the left eye correction optical system and the right eye optical path including the right eye correction optical system. That is, the concave mirror 85 is disposed at a position where both the left eye optical path including the left eye correction optical system and the right eye optical path including the right eye correction optical system pass through. Of course, the concave mirror 85 does not have to be configured to be shared by the left eye optical path and the right eye optical path. That is, a concave mirror may be provided in each of the left eye optical path including the left eye correction optical system and the right eye optical path including the right eye correction optical system. For example, the concave mirror 85 guides the visual target light flux that has passed through the correction optical system 60 to the subject's eye E, and forms an image of the visual target light flux that has passed through the correction optical system 60 in front of the subject's eye E.

[0066] The deflection mirror 81 is driven by a drive unit 83 (e.g., a motor or the like). For example, the drive unit 83 has a left drive unit 83L for driving the left-eye deflection mirror 81L and a right drive unit 83R for driving the right-eye deflection mirror 81R. Each deflection mirror is moved in the X direction by the drive unit 83. For example, by moving the left-eye deflection mirror 81L and the right-eye deflection mirror 81R, the distance between the left-eye deflection mirror 81L and the right-eye deflection mirror 81R is changed, and the distance in the X direction between the left-eye optical path and the right-eye optical path can be changed according to the interpupillary distance of the test eye E.

[0067] Further, the measurement unit 7 is driven by a drive unit 9 (e.g., a motor, etc.). For example, the drive unit 9 has a left drive unit 9L for driving the left eye measurement unit 7L and a right drive unit 9R for driving the right eye measurement unit 7R. Each measurement unit is moved in the X direction by the drive unit 9. For example, the left eye measurement unit 7L and the right eye measurement unit 7R are moved, so that the distance between each measurement unit and the deflection mirror 81 changes, and the presentation position in the Z direction of the visual target light beam from each measurement unit is changed. This allows the measurement unit 7 to be adjusted in the Z direction so that the visual target light beam corrected by the correction optical system 60 is guided to the subject's eye E and an image of the visual target light beam corrected by the correction optical system 60 is formed on the fundus of the subject's eye E.

[0068] <Optical paths between objective and subjective measurement sections> The optical path of the objective measurement unit will be described by taking the optical path for the left eye as an example. The optical path for the right eye has the same configuration as the optical path for the left eye. The measurement light beam emitted from the light source 11 of the projection optical system 10a reaches the left eye EL via each optical member. For example, the measurement light beam is guided from the measurement unit for the left eye 7L to the deflection mirror for the left eye 81L by passing through the optical members from the relay lens 12 to the dichroic mirror 29 in order. Furthermore, the visual target light beam is reflected by the deflection mirror for the left eye 81L and guided to the left eye EL via the reflection mirror 84 and the concave mirror 85. A spot-shaped point light source image is formed on the fundus of the left eye EL. At this time, the prism 15 rotating around the optical axis causes the pupil projection image of the hole part in the hole mirror 13 (projection light beam on the pupil) to be eccentrically rotated at high speed.

[0069] At the fundus of the subject's eye E, the measurement light beam is reflected and emitted, and is guided to the left-eye measurement unit 7L via the concave mirror 85, the reflecting mirror 84, and the deflection mirror 81. The measurement light beam is further reflected by the dichroic mirror 29 and the dichroic mirror 35, and is collected by the objective lens 93. The measurement light beam is then collected again on the opening of the light receiving diaphragm 18 via the prism 15 rotating at high speed and the optical members from the hole mirror 13 to the mirror 17, and is then focused as a ring-shaped image on the image sensor 22 by the collimator lens 19 and the ring lens 20. The optical characteristics of the subject's eye E can be objectively measured by analyzing the ring-shaped image captured by the image sensor 22.

[0070] The optical path of the subjective measurement section will be described by taking the optical path for the left eye as an example. The optical path for the right eye has the same configuration as the optical path for the left eye. The visual target light beam emitted from the display 31 of the subjective measurement optical system 25 reaches the left eye EL via each optical member. For example, the visual target light beam is guided from the left eye measurement section 7L to the left eye deflection mirror 81L by passing through the optical members from the light projecting lens 33 to the dichroic mirror 29 in order. Furthermore, the visual target light beam is reflected by the left eye deflection mirror 81L and guided to the left eye EL via the reflection mirror 84 and the concave mirror 85.

[0071] As a result, an image of the visual target light beam corrected by the correction optical system 60 is formed on the fundus of the left eye EL based on the eyeglass wearing position of the left eye EL (for example, about 12 mm from the corneal apex position). Therefore, adjustment of the spherical power by the correction optical system (in this embodiment, driving of the drive mechanism 39) is performed in front of the eye, which is equivalent to placing the astigmatism correcting optical system 63 in front of the eye. The subject can collimate the image of the visual target light beam optically formed in front of the eye at a predetermined test distance via the concave mirror 85 in a natural state.

[0072] <Control Unit> 6 is a diagram showing a control system of the optometry apparatus 100. The control unit 70 includes a CPU (processor), a RAM, a ROM, and the like. For example, the CPU controls each component in the optometry apparatus 100. For example, the RAM temporarily stores various types of information. For example, the ROM stores various programs, optotypes, initial values, and the like for controlling the operation of the optometry apparatus 100. The control unit 70 may be composed of multiple control units (i.e., multiple processors).

[0073] For example, the control unit 70 is electrically connected to various components such as the monitor 6a, the light source 11, the image sensor 22, the display 31, the image sensor 52, and a non-volatile memory 75 (hereinafter, memory 75). In addition, for example, the control unit 70 is electrically connected to the drive unit 9, the drive unit 82, the drive unit 83, the drive mechanism 39, and the like. For example, the memory 75 is a non-transient storage medium that can retain the stored contents even if the power supply is cut off. For example, the memory 75 can be a hard disk drive, a flash ROM, a USB memory, or the like.

[0074] <Control action> The control operation of the optometric apparatus 100 having the above-mentioned configuration will be described.

[0075] For example, the examiner has the subject place his / her face against the forehead rest 4 and the chin rest 5, and have the subject's eye E fixate a fixation target displayed on the display 31. For example, the control unit 70 projects an alignment index onto the cornea of ​​the subject's eye E and photographs the anterior segment to obtain an anterior segment image including an alignment index image. The control unit 70 also detects the amount of deviation of the measurement unit 7 from the subject's eye E in the X, Y, and Z directions based on the alignment index image, and moves the measurement unit 7 based on the amount of deviation. This automatically aligns the subject's eye E with the measurement unit 7.

[0076] For example, when the alignment with the subject's eye E is completed, the examiner sets the initial values ​​of the correction power for correcting the subject's eye E. For example, the examiner presents a target at a distance distance to the subject's eye E, and inputs the initial values ​​of the spherical power, the cylindrical power, and the astigmatic axis angle by operating the switch unit 6b based on the objective ocular refractive power measured in a state where accommodation is at rest.

[0077] The control unit 70 controls at least one of the light projection optical system 30 and the correction optical system 60 in response to an input signal from the switch unit 6b. For example, the control unit 70 generates a spherical power by moving the display 31 in the optical axis direction. Also, for example, the control unit 70 generates at least one of a cylindrical power and an astigmatic axis angle by rotating the cylindrical lens 61a and the cylindrical lens 61b around the optical axis. As a result, the subject's eye E becomes emmetropic (spherical power 0.00D, cylindrical power 0.00D, astigmatic axis angle 0 degrees).

[0078] In this embodiment, as one method for acquiring accommodation information of the test eye, a flipper test is performed on the test eye E when the test eye E is in a normal state. For example, the flipper test is a test for measuring whether or not the accommodation response is performed smoothly by a sudden change in accommodation stimulus (in other words, a change in spherical power) to the test eye E. For example, the above-mentioned sudden accommodation stimulus can be given to the test eye E by alternately adding the same spherical power with different signs.

[0079] In the conventional flipper test, which is one method for acquiring accommodation information of the subject's eye, a flipper lens consisting of a plus lens and a minus lens with the same spherical power but different signs is placed in front of the subject's eye E, and the plus lens and the minus lens are manually inverted alternately to change the spherical power suddenly. On the other hand, in the flipper test of this embodiment, instead of placing a flipper lens in front of the subject's eye E, the spherical power is changed suddenly by changing the presentation distance of the optotype presented to the subject's eye E to add a predetermined spherical power. More specifically, the display 31 is automatically moved alternately in the optical axis direction to alternately add a first correction power for changing the refractive power by a predetermined power on the minus side and a second correction power for changing the refractive power by a predetermined power on the plus side to the subject's eye E. For example, this allows the accommodation information (described later) of the subject's eye E to be acquired.

[0080] Hereinafter, a flow of acquiring accommodation information using the optometry apparatus 100 will be described in detail with reference to the flowchart in Fig. 7. For example, the examiner operates the switch unit 6b to select a switch for starting acquisition of accommodation information of the subject's eye E. For example, the control unit 70 starts each control, which will be described later, in response to an input signal from the switch unit 6b.

[0081] <Placing the target near: S1> In step S1, a visual target presented to the subject's eye is positioned from a far distance to a near distance. For example, the control unit 70 controls the drive unit 95 to move the display 31 from a far distance (for example, 5 m) to a near distance (for example, 40 cm). For example, when a visual target presented to the subject's eye is positioned at a near distance, the subject's eye adjusts to recognize the visual target.

[0082] Fig. 8 is a diagram for explaining the accommodation state of the test eye with respect to the change in the presentation distance of the optotype. Fig. 8(a) shows a state in which the test eye E recognizes an optotype placed at a distance distance in a state of accommodation rest. In other words, Fig. 8(a) is the same as the state in which the test eye is corrected with the initial value. Fig. 8(b) and Fig. 8(c) show a state in which the test eye recognizes an optotype placed at a near distance.

[0083] For example, in the state of FIG. 8(a), the subject's eye is emmetropic, the crystalline lens of the subject's eye E has a predetermined thickness, and the visual target light beam from the display 31 is imaged at the fundus position t1. In this case, the subject's eye can clearly recognize the visual target. Immediately after the visual target is placed at the near distance in step S1, the state changes from FIG. 8(a) to FIG. 8(b). In this case, the visual target light beam from the display 31 is imaged at a position t2 behind the fundus position t1. The subject's eye recognizes the visual target in a blurred state. Furthermore, when time has passed since the visual target is placed at the near distance in step S1, the state changes from FIG. 8(b) to FIG. 8(c). In this case, the subject's eye adjusts, changing the thickness of the crystalline lens to focus on the retina, and the visual target light beam from the display 31 is imaged again at the fundus position t1. The subject's eye can clearly recognize the visual target.

[0084] <Acquisition of objective measurement results: S2> When the optotype presented to the subject's eye is placed at the near distance in step S1, objective measurement of the subject's eye E is started in step S2, and the measurement result (objective value) is obtained. For example, the control unit 70 controls the objective measurement optical system 10 to start the objective measurement at approximately the same time (or after) the display 31 is moved to the near distance. For example, the control unit 70 performs objective measurement on the subject's eye at every predetermined timing, obtains the objective value of the subject's eye E, and stores it in the memory 75. The predetermined timing at which the objective measurement is performed may be a predetermined interval (for example, every 2 seconds) or may be constant (real time).

[0085] For example, the control unit 70 causes the light source 11 to irradiate the measurement light beam toward the fundus of the subject's eye E. Also, for example, the control unit 70 obtains a ring image in which the measurement light beam reflected by the fundus is imaged by the image sensor 22. Furthermore, for example, the control unit 70 analyzes and processes the ring image to obtain the ocular refractive power in each meridian direction, and performs a predetermined process on the ocular refractive power to obtain the objective value of the subject's eye E as a measurement result.

[0086] <Determining whether the visual target was recognized: S3> In step S3, it is determined whether the subject's eye E clearly recognizes the target placed at the near distance based on the objective value obtained in step S2. In other words, it is determined whether the subject's eye E adjusts and focuses on the retina based on the objective value. For example, such a determination process is executed sequentially every time an objective value is obtained.

[0087] For example, in the state of Fig. 8(a), the subject's eye is in a normal vision state, and a ring image of a predetermined size is obtained by performing an objective measurement on the subject's eye. For example, the control unit 70 can obtain a spherical power of 0.00D, a cylindrical power of 0.00D, and an astigmatism axis angle of 0 degrees as objective values ​​by analyzing the ring image of a predetermined size.

[0088] For example, in the state of FIG. 8(b), the visual target is placed at a near distance, and a spherical power is generated. As an example, when the visual target is placed at 40 cm, a spherical power of -2.50D is generated. At this time, since the subject's eye is not focused on the visual target, when an objective measurement is performed on the subject's eye, a ring image of a predetermined size is obtained as in FIG. 8(a). For example, the control unit 70 can analyze such a ring image to obtain a spherical power of 0.00D, a cylindrical power of 0.00D, and an astigmatism axis angle of 0 degrees as objective values.

[0089] For example, in the state of FIG. 8(c), after the visual target is placed at a near distance, the subject's eye E gradually adjusts (thickens the crystalline lens), causing the refractive index of the crystalline lens to change. At this time, the subject's eye exerts an accommodation force equivalent to a spherical power of -2.50D in order to focus on the visual target. Therefore, the size of the above-mentioned predetermined ring image changes, and a ring image smaller than the predetermined ring image is obtained. For example, the control unit 70 can analyze such a ring image to obtain a spherical power of -2.50D, a cylindrical power of 0.00D, and an astigmatism axis angle of 0 degrees as objective values.

[0090] For example, the control unit 70 may determine whether the subject's eye E recognizes the target by detecting the spherical power of the subject's eye E. More specifically, the control unit 70 may sequentially acquire the objective value of the subject's eye, and when it detects that the objective value is different from a predetermined spherical power (here, -2.50D), determine that the subject's eye E does not clearly recognize the target (step S3: NO). The control unit 70 may also sequentially acquire the objective value of the subject's eye, and when it detects that the objective value has become a predetermined spherical power, determine that the subject's eye E clearly recognizes the target (step S3: YES). Of course, for example, taking into consideration fluctuations in the objective value of the subject's eye, it may also be determined that the subject's eye E clearly recognizes the target when a state of a predetermined spherical power continues for a predetermined time (for example, 3 seconds).

[0091] The state in which the test eye E clearly recognizes the target placed at the near distance is a state in which the test eye E is accommodating and using a certain level of accommodation power, which is the reference state in the flipper test. Therefore, the test eye E can both weaken accommodation from the reference state and strengthen accommodation from the reference state.

[0092] <Start of loop processing: S4> Step S4 indicates the start of the loop process, and the following steps S5 to S10 are repeated for a predetermined time. For example, the predetermined time for the loop process is 60 seconds. Of course, the predetermined time for the loop process may be different from 60 seconds.

[0093] FIG. 9 is a diagram for explaining the accommodation state of the subject's eye in the process from step S5 to step S10. FIG. 9(a) shows the reference state of the flipper test for the subject's eye. In other words, it is a state in which the subject's eye clearly sees a target placed at a near distance, and the target light beam is imaged at the fundus position t1. For example, at this time, the display 31 is placed at a predetermined reference position 301 (here, a position of 40 cm). FIG. 9(b) and FIG. 9(c) show a state in which the display 31 is moved from the reference position 301 to change the optical characteristics of the target light beam.

[0094] For example, in the process from step S5 to step S10, the first correction power for changing the refractive power by a predetermined power on the minus side or the second correction power for changing the refractive power by a predetermined power on the plus side is alternately added to the eye E from the reference state of the flipper test (see FIG. 9(a)). In other words, from a state in which the eye E clearly sees a target placed at a near distance and the target light beam is imaged at a fundus position t1, the first correction power for imaging the target light beam at a position t2 behind the fundus position t1 or the second correction power for imaging the target light beam at a position t3 in front of the fundus position t1 is alternately added. For example, in this embodiment, the first correction power and the second correction power can be added by moving the display 31. The first correction power and the second correction power may be the same spherical power with different signs.

[0095] <Setting the first correction power: S5> In step S5, a first correction power for changing the refractive power by a predetermined power on the negative side is set for the eye E. For example, a spherical power of -2.00D may be set as the first correction power. For example, when the control unit 70 determines that the eye E recognizes the target in step S3, it controls the drive unit 95 to move the display 31 to a first movement position 302 corresponding to the first correction power. For example, the display 31 is already placed at the reference position 301 (corresponding to a spherical power of -2.50D) which is a near distance, but is placed at the first movement position 302 corresponding to -4.50D in order to generate the first correction power (spherical power of -2.00D) with respect to the reference position 301. As a result, for example, the eye E changes from the state shown in FIG. 9(a) to the state shown in FIG. 9(b).

[0096] For example, in the state of Fig. 9(b), as the display 31 approaches the subject's eye, the visual target light beam is imaged at a position t2, which is deeper than the fundus. However, as the subject's eye E gradually strengthens accommodation (the crystalline lens becomes thicker), the refractive index of the crystalline lens changes, and an accommodation power equivalent to a spherical power of -4.50D is exerted. As a result, the visual target light beam is imaged again at the fundus position t1.

[0097] In step S5, when the control unit 70 moves the display 31 to the first movement position 302, the control unit 70 increments the number of times the first correction power has been set based on the movement completion signal.

[0098] <Acquisition of objective measurement results: S6> When the first correction power is set for the subject's eye in step S5, the objective measurement of the subject's eye E is started in step S6. For example, the control unit 70 controls the objective measurement optical system 10 to start the objective measurement at approximately the same time as moving the display 31 to the first movement position 302. For example, the control unit 70 obtains ring images at predetermined timings, as in step S2, and sequentially analyzes the ring images to obtain objective values.

[0099] <Determining whether the visual target was recognized: S7> In step S7, it is determined whether the subject's eye E clearly recognizes the optotype placed at the first movement position 302 based on the objective value obtained in step S6. For example, similar to step S3, when the control unit 70 detects that the spherical power of the subject's eye is different from -4.50D, the control unit 70 may determine that the subject's eye E does not clearly recognize the optotype (step S7: NO). Also, for example, when the control unit 70 detects that the spherical power of the subject's eye has become -4.50D, the control unit 70 may determine that the subject's eye E clearly recognizes the optotype (step S7: YES).

[0100] <Setting the second correction power: S8> In step S8, a second correction power for changing the refractive power by a predetermined power on the positive side is set for the eye E. For example, a spherical power of +2.00D may be set as the second correction power. For example, when the control unit 70 determines that the eye E recognizes the target in step S7, it controls the drive unit 95 to move the display 31 to a second movement position 303 corresponding to the second correction power. For example, the display 31 is disposed at the first movement position 302 (corresponding to a spherical power of -4.50D), but is disposed at the second movement position 303 corresponding to -0.50D in order to generate a second spherical power (spherical power of +2.00D) with respect to the reference position 301. As a result, for example, the eye E changes from the state shown in FIG. 9(b) to the state shown in FIG. 9(c).

[0101] For example, in the state of Fig. 9(c), as the display 31 moves away from the subject's eye, the visual target light beam is imaged at a position t3 in front of the fundus. However, as the subject's eye E gradually weakens accommodation (the crystalline lens becomes thinner), the refractive index of the crystalline lens changes, and an accommodation power equivalent to a spherical power of -0.50D is exerted. As a result, the visual target light beam is imaged again at the fundus position t1.

[0102] In step S8, when the control unit 70 moves the display 31 to the second movement position 303, the control unit 70 increments the number of times the second correction power has been set based on the movement completion signal.

[0103] <Acquisition of objective measurement results: S9> When the second correction power is set for the subject's eye in step S8, objective measurement of the subject's eye E is started in step S9. For example, the control unit 70 controls the objective measurement optical system 10 to start objective measurement at approximately the same time as moving the display 31 to the second movement position 303. For example, the control unit 70 obtains ring images at predetermined timings, and sequentially analyzes the ring images to obtain objective values, similar to steps S2 and S6.

[0104] <Determining whether the visual target is recognized: S10> In step S10, it is determined whether the subject's eye E clearly recognizes the optotype placed at the second movement position 303 based on the objective value obtained in step S9. For example, similar to steps S3 and S7, when the control unit 70 detects that the spherical power of the subject's eye is different from -0.50D, it may determine that the subject's eye E does not clearly recognize the optotype (step S10: NO). Also, for example, when the control unit 70 detects that the spherical power of the subject's eye has become -0.50D, it may determine that the subject's eye E clearly recognizes the optotype (step S10: YES).

[0105] As in steps S5 to S10, when the control unit 70 determines that the subject's eye E clearly recognizes the visual target while the first or second correction power is set for the subject's eye E, it moves the display 31 based on the determination signal output by the control unit 70. That is, the control unit 70 alternately sets the first and second correction powers for the subject's eye E, and moves the display 31 to either the first movement position 302 or the second movement position 303 based on the determination signal indicating the subject's eye's recognition of the visual target. For example, after the control unit 70 has proceeded in sequence from step S5 to step S10, it returns to step S5 and repeats the alternation between the first and second correction powers. Also, for example, the control unit 70 adds the number of times the first and second correction powers have been set to each of them at any time, and stores them in the memory 75.

[0106] <End of loop processing: S11> Step S11 indicates the end of the loop process. For example, when the time measurement by a timing mechanism (not shown) reaches 60 seconds, the control unit 70 ends the repeat control of the processes from step S5 to step S10. For example, the control unit 70 ends the repeat control regardless of the situation of which step the process is proceeding in, and transitions to the process of step S12.

[0107] <Acquisition of regulatory information: S12> In step S12, accommodation information of the subject's eye E is acquired based on the result of objective measurement when the first and second corrective powers are repeatedly set. For example, the control unit 70 may acquire the number of times the first and second corrective powers are set (i.e., the number of times the first and second corrective powers are switched to each other) as accommodation information of the subject's eye. In addition, for example, the control unit 70 may acquire the number of cycles based on the number of times the subject's eye clearly recognizes the optotype as accommodation information of the subject's eye.

[0108] For example, the control unit 70 processes various data accumulated by the aforementioned repeated control in response to a completion signal of 60-second measurement. For example, the control unit 70 acquires the total number of times the first correction power was set. Also, for example, the control unit 70 acquires the total number of times the second correction power was set. Also, for example, the control unit 70 adds the total number of times the first correction power was set and the total number of times the second correction power was set, and divides the result by 2 to acquire the number of times the subject's eye has reciprocated between the first correction power (negative power) and the second correction power (positive power) as the number of cycles.

[0109] <Output of adjustment information: S13> In step S13, accommodation information of the subject's eye is output. For example, the control unit 70 causes the monitor 6a to display the accommodation information of the subject's eye.

[0110] 10 is an example of an operation screen 200 on the monitor 6a. For example, the operation screen 200 can display a schematic diagram 201, a total number of times the first correction power has been set 202, a total number of times the second correction power has been set 203, a number of cycles 204, and the like. For example, the schematic diagram 201 is a diagram that shows the addition of the first correction power and the second correction power to the subject's eye E. For example, the schematic diagram 201 may include a diagram showing an eye, a diagram showing a minus lens corresponding to the first correction power, and a diagram showing a plus lens corresponding to the second correction power. Also, for example, the schematic diagram 201 may include an arrow, a number, or the like that shows the inversion of the first correction power and the second correction power.

[0111] For example, the examiner can easily obtain accommodation information of the subject's eye E by checking the operation screen 200. Also, for example, the examiner can easily grasp the accommodation function of the subject's eye E based on the accommodation information of the subject's eye E. As an example, it can be determined whether the cycle number 204 of the subject's eye is similar to the average cycle number of adults and children. Furthermore, for example, the examiner can use the accommodation information of the subject's eye to screen for accommodation abnormalities of the subject's eye.

[0112] As described above, for example, in the subjective optometry device of this embodiment, in a state where the presentation distance of the optotype to the eye to be examined is set to any distance between the near distance and the intermediate distance of the eye to be examined, a first correction power for changing the refractive power by a predetermined power on the minus side and a second correction power for changing the refractive power by a predetermined power on the plus side are alternately set for the eye to be examined, and accommodation information of the eye to be examined is acquired and output based on the measurement result of the objective measurement when the first correction power and the second correction power are repeatedly set. This allows the examiner to easily acquire accommodation information of the eye to be examined. For example, for the flipper test, which is one method for acquiring accommodation information of the eye to be examined, the examiner is required to invert the flipper lens based on the answer of the examinee and add the same correction power with a different sign to the eye to be examined, and the like, and therefore the accommodation information can be easily acquired. For example, the examiner can use the accommodation information to grasp the accommodation function of the eye to be examined and screen for accommodation abnormalities of the eye to be examined.

[0113] Also, for example, the subjective optometry device of this embodiment judges whether the subject's eye recognizes the optotype based on the measurement result of the objective measurement means of the subject's eye, and when it is judged that the subject's eye recognizes the optotype, reverses one of the first and second correction powers to the other. This makes it easy to grasp the recognition of the optotype by the subject's eye, and allows the accommodation information of the subject's eye to be obtained with high accuracy. For example, in a flipper test for obtaining accommodation information of the subject's eye, the subject subjectively judges whether or not the subject recognizes the optotype by adjusting, so there is a possibility that the measurement result is not obtained correctly, and the measurement accuracy may vary. However, by judging whether or not the subject's eye recognizes the optotype based on the measurement result of the objective measurement, a certain level of measurement accuracy can be maintained. Furthermore, for example, the first and second correction powers are reversed based on such a judgment result, so that the accommodation information of the subject's eye can be obtained more accurately.

[0114] In addition, for example, the subjective optometry device of this embodiment obtains the number of reversals of the first and second correction powers within a predetermined time as accommodation information. For example, the operator can easily grasp the accommodation function of the subject's eye based on the number of reversals. As an example, the operator can grasp the speed of accommodation change of the subject's eye.

[0115] <Example of transformation> In the optometry apparatus of the present embodiment, the case where the subject's eye is judged to have recognized the optotype when the objective measurement of the subject's eye reaches a predetermined spherical power has been described as an example, but the present invention is not limited thereto. For example, a tolerance range may be provided for the predetermined spherical power that is the reference for judging that the subject's eye has recognized the optotype. As an example, a tolerance range of ±0.25D may be provided. For example, in this case, the control unit 70 may judge that the subject's eye E has clearly recognized the optotype when the objective measurement of the subject's eye falls within the tolerance range. Note that, for example, such a tolerance range for the reference spherical power may be a fixed value set in advance, or the examiner may be able to arbitrarily change the value.

[0116] In this way, for example, the subjective optometry device of this embodiment judges whether the test eye recognizes the optotype by judging whether the measurement result of the objective measurement means of the test eye is within the tolerance range indicating that the test eye recognizes the optotype. For example, when the test eye adjusts to recognize the optotype, the test eye may stop adjusting even if the test eye does not see the optotype clearly, judging that the test eye can see it to some extent. For this reason, for example, if the judgment criteria for the measurement result of the objective measurement are set too strictly, the measurement for obtaining the accommodation information of the test eye may not proceed smoothly. Therefore, as in this embodiment, the measurement for obtaining the accommodation information of the test eye can be smoothly performed by appropriately setting the tolerance range indicating the recognition of the optotype for the measurement result of the objective measurement.

[0117] In the optometry apparatus of this embodiment, the first and second correction powers are set to ±2.00D for the eye to be examined, and these powers are alternately inverted. However, the present invention is not limited to this. For example, the first and second correction powers do not necessarily have to be ±2.00D as long as they are the same powers with different signs. As an example, the first and second correction powers may be ±1.50D, ±1.00D, etc. For example, the first and second correction powers may be fixed values ​​set in advance, or the examiner may be able to set any value.

[0118] In the optometry apparatus of the present embodiment, the number of times the first and second correction powers are set is acquired as the accommodation information of the subject's eye, but the present invention is not limited to this. For example, the elapsed time from setting the first correction power to recognizing the optotype (in other words, the time required from setting the first correction power to setting the second correction power) and the elapsed time from setting the second correction power to recognizing the optotype (in other words, the time required from setting the second correction power to setting the first correction power) may be acquired as the accommodation information of the subject's eye. For example, in this case, the control unit 70 may store in the memory 75 the timing of setting the first and second correction powers in association with the elapsed time of the loop process measured by a clock mechanism (not shown).

[0119] For example, the control unit 70 can obtain the time required for the subject's eye E to recognize the optotype by calculating the difference between the timing when the first corrective power is set for the subject's eye and the timing when the second corrective power is set for the subject's eye. As an example, the control unit 70 may obtain the time required for the subject's eye E to recognize the optotype when the first corrective power is changed to the second corrective power. Similarly, the control unit 70 may obtain the time required for the subject's eye E to recognize the optotype when the second corrective power is changed to the first corrective power. For example, the control unit 70 may average the times required for the subject's eye E to recognize the optotype and display the average on the operation screen 200.

[0120] In the optometry apparatus of the present embodiment, the accommodation information of the subject's eye is output as values ​​such as the total number of times the first and second correction powers are set, the number of cycles of going back and forth between the first and second correction powers, and the time required to recognize the optotype, but is not limited thereto. For example, the accommodation information of the subject's eye may be output to the operation screen 200 as a graph.

[0121] In this embodiment, the graph 205 (see FIG. 10) shows the time required for the subject's eye E to recognize the target. For example, the vertical axis of the graph 205 shows the values ​​of the first and second correction powers, and the horizontal axis shows the elapsed time of the loop process from step S5 to step S10. For example, the control unit 70 may draw the graph 205 in real time every time the settings of the first and second correction powers are changed, or may create the graph 205 in step S12. For example, in such a graph 205, the length of the broken line plotted on the first and second correction powers is shown as the time required to recognize the target. For example, the examiner can visually judge the accommodation function of the subject's eye by checking the graph 205. As an example, if the broken line plotted on the first correction power tends to be longer than the broken line plotted on the second correction power, information such as the reaction of the subject's eye E to strengthen accommodation is not smoother than the reaction to weaken accommodation can be obtained.

[0122] For example, the vertical axis of the graph 205 may be a value different from the values ​​of the first corrected power and the second corrected power. As an example, it may be an objective value acquired by objective measurement of the subject's eye E. Also, for example, the vertical axis of the graph 205 may indicate the values ​​of the first corrected power and the second corrected power as the first vertical axis, and the objective value as the second vertical axis.

[0123] In addition to the accommodation information of the subject's eye, the control unit 70 may output notification information notifying that there is an abnormality in the accommodation function of the subject's eye (or that there is a suspicion of an abnormality in the accommodation function). For example, such notification information may be a message such as a dialog box. Also, for example, such notification information may be a highlighting display (e.g., bold, underline, change of character color, etc.) of at least one of the total number of times the first correction power and the second correction power are set, the number of cycles of going back and forth between the first correction power and the second correction power, the time required to recognize the optotype, etc. Furthermore, for example, such notification information is not limited to being displayed on the monitor 6a, and may be output by at least one of lighting or blinking of a lamp, generation of a voice announcement, etc.

[0124] In the optometry apparatus of this embodiment, the repeated control from step S5 to step S10 is set for 60 seconds, but the present invention is not limited to this. For example, the repeated control from step S5 to step S10 may be set for 60 seconds or more, or for 60 seconds or less. For example, the time for which the repeated control is performed may be a fixed time set in advance, or may be set by the examiner at will.

[0125] Also, for example, the control of the repetition from step S5 to step S10 can proceed to step S12 even if it is less than 60 seconds. In this case, the control unit 70 may proceed to step S12 when the same tendency is observed in the elapsed time from setting the first corrective power to the eye E to recognizing the optotype and the elapsed time from setting the second corrective power to the eye E to recognizing the optotype. As an example, when the elapsed time from setting the first corrective power to the eye E to recognizing the optotype is approximately the same number of seconds for a predetermined number of times (e.g., three times), and when the elapsed time from setting the second corrective power to the eye E to recognizing the optotype is approximately the same number of seconds for a predetermined number of times, the control unit 70 may proceed to step S12 without waiting for the repetition of 60 seconds. This makes it possible to grasp the accommodation function of the eye E while shortening the measurement time for the eye E, for example.

[0126] In the optometry apparatus of the present embodiment, the case where accommodation information is acquired for the subject's eye on a specific examination date has been described as an example, but the present invention is not limited thereto. For example, accommodation information can be acquired for the subject's eye on a plurality of examination dates on different dates. In this case, for example, a plurality of pieces of accommodation information may be stored in the memory 75 in association with subject information (such as ID) and dates. For example, the control unit 70 may output the change in accommodation information over time by calling up the accommodation information of the subject's eye from the memory 75. For example, if there is an abnormality in the accommodation function of the subject's eye, training or the like may be performed to restore the accommodation of the subject's eye. For this reason, as an example, by making it possible to confirm the change over time in the flipper test for the subject's eye, it is possible to easily grasp whether the effect of the training is being achieved.

[0127] In the optometry device of this embodiment, the case where accommodation information is acquired for one eye of the subject has been described as an example, but the present invention is not limited thereto. For example, accommodation information may be acquired for both eyes of the subject. For example, in this case, the control unit 70 sets a first correction power and a second correction power for each of the left eye and the right eye, and judges whether the visual target is recognized by both eyes. For example, the control unit 70 may determine that the subject's eye E clearly recognizes the visual target with both eyes when the left eye and the right eye each have a predetermined spherical power after setting the first correction power (second correction power) for the left eye and the right eye. Also, for example, the control unit 70 may output accommodation information for both eyes based on the objective value when the first correction power and the second correction power are repeatedly set for the left eye and the right eye.

[0128] For example, when a subject recognizes a visual target with both eyes, accommodation between the left and right eyes is accompanied by convergence or divergence. Therefore, for example, as accommodation information of the subject's eyes, in addition to the accommodation function of the subject's eyes, the convergence function and divergence function can be obtained.

[0129] In this way, for example, the subjective optometry device of this embodiment includes a measuring means having a pair of measuring means for the left eye and the right eye, and alternately sets the first and second correction powers for both the left and right eyes. This allows the examiner to simultaneously obtain accommodation information for not only one eye of the examinee, but both eyes. For example, by using the accommodation information for both eyes, the examiner can easily grasp accommodation abnormalities specific to both eyes (for example, accommodation abnormalities related to the interrelationship between accommodation and convergence, etc.) in addition to accommodation abnormalities of only one eye.

[0130] In this embodiment, the optometry apparatus is described as an example in which the first and second correction powers can be set without placing any optical member in front of the eye E and with the eye E open, but the present invention is not limited thereto. For example, the optometry apparatus may be an apparatus that is placed in front of the eye E and includes an eye refractive power measuring unit having a correction optical system therein, and an objective optical system for objectively measuring the optical characteristics of the eye E. In this case, the optometry apparatus controls the eye refractive power measuring unit to alternately set the first and second correction powers, and controls the objective optical system to obtain objective values ​​when each correction power is set.

[0131] Furthermore, for example, the eye examination apparatus may be an eye refractive power measuring apparatus that objectively measures the eye refractive power of the subject's eye as described in JP 2006-187483 A. In this case, for example, a fixation target for fixating the subject's eye E may be moved in the optical axis direction to alternately set the first and second correction powers for the subject's eye.

[0132] In the optometry apparatus of the present embodiment, the subject's eye is placed in an accommodation state by arranging the optotype presented to the subject's eye at a near distance, and the flipper test is performed, but the present invention is not limited to this. For example, the flipper test may be performed by placing the optotype presented to the subject's eye at a far distance and placing the subject's eye in an accommodation state. For example, in this case, the optotype may be placed at a far distance, and the subject's eye may be corrected with a predetermined correction power to create a state in which the subject's eye is not focused on the optotype. After that, the subject's eye focuses on the optotype by applying the accommodative power, and the subject's eye is placed in an accommodation state. For example, by setting the reference state in the flipper test to such a state, even if the optotype is placed at a far distance, the accommodation can be weakened or strengthened from the reference state. [Explanation of symbols]

[0133] 2. Cabinet 6 Controller 7 Measuring part 10 Objective Measuring Optical System 25 Subjective Measuring Optical System 30 Projection optical system 40 Alignment Optical System 50 Observation Optical System 60 Corrective optical system 70 Control section 75 Memory 90 Imaging section 100 Optometry equipment

Claims

1. A subjective optometry device for subjectively measuring optical characteristics of a subject's eye, a presentation distance setting means for controlling the driving of a target presenting means for presenting a target to the subject's eye, and for setting a presentation distance of the target to the subject's eye at any distance between a near distance and an intermediate distance of the subject's eye; a subjective measuring means for subjectively measuring the optical characteristics of the subject's eye, the subject having a corrective means for changing the optical characteristics of the target light beam emitted from the target presenting means; an objective measuring means for objectively measuring optical characteristics of the subject's eye by projecting a measurement light beam onto the fundus of the subject's eye and receiving a reflected light beam of the measurement light beam reflected by the fundus; a correction control means for controlling the correction means in a state in which the presentation distance setting means has set the presentation distance, and alternately setting, for the eye to be examined, a first correction power for changing the refractive power by a predetermined power on the minus side and a second correction power for changing the refractive power by the predetermined power on the plus side; an accommodation information acquiring means for acquiring accommodation information of the subject's eye based on the measurement result of the objective measurement means when the correction control means repeatedly sets the first correction power and the second correction power; an output means for outputting the adjustment information acquired by the adjustment information acquisition means; A subjective ophthalmological examination device comprising:

2. The subjective ophthalmological examination device of claim 1, a determination means for determining whether the subject's eye has recognized the target based on the measurement result of the subject's eye by the objective measurement means, The subjective ophthalmological examination device is characterized in that the correction control means reverses one of the first correction power and the second correction power to the other when the judgment means determines that the subject's eye has recognized the optotype.

3. The subjective ophthalmological examination device according to claim 2, The subjective ophthalmological examination device is characterized in that the determination means determines whether the subject's eye has recognized the optotype by determining whether the measurement result of the subject's eye by the objective measurement means is within an acceptable range indicating that the subject's eye recognizes the optotype.

4. In the subjective ophthalmological examination device according to any one of claims 1 to 3, The subjective ophthalmological examination device is characterized in that the adjustment information acquisition means acquires, as the adjustment information, the number of times that the first correction power and the second correction power are inverted within a predetermined time.

5. The subjective ophthalmological examination device of claim 1, a measuring means having the subjective measuring means and the objective measuring means, the measuring means having a pair of measuring means for the left eye and measuring means for the right eye; The subjective optometry device is characterized in that the correction control means alternately sets the first correction power and the second correction power for both the left eye and the right eye.

6. A subjective optometry program for use in a subjective optometry device that subjectively measures the optical characteristics of the eye to be examined, the subjective optometry program comprising: a subjective measurement means having a correction means for changing the optical characteristics of a target light beam emitted from a target presenting means, and an objective measurement means for objectively measuring the optical characteristics of the eye to be examined by projecting a measurement light beam onto a fundus of the eye to be examined and receiving a reflected light beam of the measurement light beam reflected by the fundus, the program comprising: When executed by the processor of the subjective optometry device, a presentation distance setting step of controlling the driving of an optotype presenting means that presents an optotype to the subject's eye, and setting a presentation distance of the optotype with respect to the subject's eye to any distance from a near distance to an intermediate distance of the subject's eye; a correction control step of controlling the corrective means in a state where the presentation distance has been set in the presentation distance setting step, and alternately setting a first correction power for changing the refractive power by a predetermined power on the minus side and a second correction power for changing the refractive power by the predetermined power on the plus side for the eye to be examined; an accommodation information acquiring step of acquiring accommodation information of the subject's eye based on the measurement result of the objective measurement means when the first correction power and the second correction power are repeatedly set in the correction control step; an output step of outputting the adjustment information acquired in the adjustment information acquisition step; A subjective optometry program that causes the subjective optometry device to execute the above.

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