Subjective optometer and subjective optometric program

Abstract

To provide a subjective optometer and a subjective optometric program capable of executing an addition examination on an eye to be examined accurately.SOLUTION: A subjective optometer for subjectively measuring eye refractive power of an eye to be examined includes: correction means disposed in front of the eye to be examined for changing optical characteristics of a target light beam; acquisition means for acquiring at least a cylindrical correction quantity and an astigmatism axis correction quantity for the eye to be examined; and control means for controlling the correction means. The correction means includes a Stokes lens including a first cylindrical lens and a second cylindrical lens. The control means changes a composite axis angle of the first cylindrical lens and the second cylindrical lens to a predetermined axis angle based on the cylindrical correction quantity and the astigmatism axis correction quantity in an addition examination on the eye to be examined. The composite axis angle is an axis angle taking into account a deviation amount of the astigmatism axis correction quantity that occurs when assuming that an optical member and a cross cylinder lens are arranged for correcting the eye to be examined by the cylindrical correction quantity and the astigmatism axis correction quantity.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 the ocular refractive power of a subject's eye. [Background technology]

[0002] There is known a subjective eye examination device that measures the ocular refractive power of the subject's eye by placing an optical member in front of the subject's eye and presenting a test target through the optical member to the subject's eye. In Patent Document 1, two cylindrical lenses having the same absolute value of focal length but different signs are used as optical members, and the cylindrical refractive power and the astigmatism axis angle of the target light beam are changed to change the cylindrical correction amount and the astigmatism axis correction amount for correcting the subject's eye. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-329450 A Summary of the Invention [Problem to be solved by the invention]

[0004] In subjective measurements of the examinee's eye, an add power test may be performed in which an add power is added to the correction amount at a specified test distance of the examinee's eye. However, when combining the above two cylindrical lenses, there is a possibility that a deviation will occur in the spherical correction amount of the examinee's eye, making it impossible to obtain an accurate add power.

[0005] In view of the above-mentioned conventional techniques, the present disclosure has as its technical object to provide a subjective optometry device and a subjective optometry program capable of performing an addition power test on a subject's eye with high accuracy. [Means for solving the problem]

[0006] In order to solve the above problems, the present disclosure is characterized by having the following configuration. (1) A subjective eye examination device according to a first aspect of the present disclosure is a subjective eye examination device for subjectively measuring the ocular refractive power of a subject's eye, comprising: a correcting means arranged in front of the subject's eye and changing optical characteristics of the visual target light beam emitted from a visual target presenting means; an acquiring means acquiring at least an amount of cylindrical correction and an amount of astigmatism axis correction for the subject's eye; and a control means controlling the correcting means, wherein the correcting means has a Stokes lens including a first cylindrical lens and a second cylindrical lens independently rotatable in front of the eye; and the control means controls the correcting means. In an addition power test for measuring the addition power corresponding to the amount of correction at a predetermined test distance of the test eye, the Stokes lens is controlled to change the composite axial angle between the first cylindrical lens and the second cylindrical lens to a predetermined axial angle based on the amount of cylindrical correction and the amount of astigmatism axial correction, and the composite axial angle is an axial angle that takes into account the amount of deviation of the astigmatism axial correction that occurs when assuming the arrangement of optical elements and a cross cylinder lens in order to correct the test eye with the amount of cylindrical correction and the amount of astigmatism axial correction. (2) A subjective eye examination program according to a second aspect of the present disclosure is a subjective eye examination program used in a subjective eye examination device for subjectively measuring the ocular refractive power of the subject's eye, the subjective eye examination program including a correction means arranged in front of a subject's eye and changing optical characteristics of a visual target light beam emitted from a visual target presenting means, the correction means having a Stokes lens including a first cylindrical lens and a second cylindrical lens that can be independently rotated in front of the eye, the subjective eye examination program being executed by a processor of the subjective eye examination device, the subjective eye examination program including an acquisition step of acquiring at least an amount of cylindrical correction and an amount of astigmatism axis correction of the subject's eye, and a control step of controlling the correction means. and the control step causes the subjective eye examination device to execute the above steps, and in the addition power test for measuring the addition power corresponding to the correction amount at a predetermined test distance of the test eye, the control step controls the Stokes lens to change the composite axial angle between the first cylindrical lens and the second cylindrical lens to a predetermined axial angle based on the cylindrical correction amount and the astigmatism axial correction amount, and the composite axial angle is an axial angle that takes into account the amount of deviation of the astigmatism axial correction amount that occurs when assuming that an optical element and a cross cylinder lens are positioned to correct the test eye with the cylindrical correction amount and the astigmatism axial correction amount. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is an external view of a subjective optometry device. [Diagram 2] FIG. 2 is a schematic diagram of a projection optical system. [Diagram 3] FIG. 2 is a schematic diagram of an eye refractive power measuring unit. [Figure 4] FIG. 1 is a schematic diagram of a lens unit; [Diagram 5] FIG. 1 is a schematic diagram of a conventional lens unit. [Figure 6] 11 is a diagram showing the change in the composite refractive power of a cylindrical lens and a cross cylinder lens of a cylindrical lens disk. FIG. [Figure 7] FIG. 2 is a schematic diagram of a control system of the subjective optometry device. [Figure 8] 11 is a diagram showing the change in the composite refractive power of a cylindrical lens and a cross cylinder lens of a cylindrical lens disk. FIG. 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. In this embodiment, the left-right direction of the subjective optometry device is the X direction, the up-down direction is the Y direction, and the front-back direction (working distance direction) is the Z direction. The letters L and R attached to the symbols indicate left and right eyes, respectively. Note that the items classified in <> below can be used independently or in association with each other.

[0009] The subjective optometry device of this embodiment (e.g., the subjective optometry device 100) is a device for subjectively measuring the ocular refractive power of the subject's eye. For example, at least one of spherical ocular refractive power, cylindrical ocular refractive power, astigmatism axis angle, etc. may be measured as the ocular refractive power of the subject's eye. Of course, the subjective optometry device may measure binocular vision function (e.g., at least one of prism amount, stereoscopic vision function, etc.), contrast sensitivity, etc. in addition to ocular refractive power.

[0010] In addition, the subjective optometry device of this embodiment is exemplified by a configuration including a target presenting means and a correction means described below, but is not limited thereto. The subjective optometry device may be configured to include at least a correction means. For example, the subjective optometry device may include only a correction means, or may include a target presenting means and a correction means as a system.

[0011] The subjective eye examination apparatus of this embodiment may further include a target presenting means for emitting a target light beam toward the subject's eye.

[0012] For example, the optotype presenting means may be a display (for example, the display 31). Also, for example, the optotype presenting means may be a light source and a DMD (Digital Micromirror Device). Also, for example, the optotype presenting means may be a light source and an optotype plate.

[0013] For example, the target light beam from the target presenting means may be directly guided toward the subject's eye. Also, for example, the target light beam from the target presenting means may be guided toward the subject's eye 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.

[0014] The subjective optometry device of this embodiment may further include a correction means arranged in front of the subject's eye and changing the optical characteristics of the target light beam emitted from the target presenting means.

[0015] The correction means may be configured to change at least one of the optical characteristics of the visual target light beam, such as the spherical refractive power, the cylindrical refractive power, and the astigmatism axis angle. As an example, the correction means may be an eye refraction measurement unit (e.g., eye refraction measurement unit 40) that switches and arranges an optical member (e.g., optical element 51) in front of the eye to be examined through an examination window (e.g., examination window 43). For example, the optical member may be at least one of a spherical lens, a cylindrical lens, a variable focus lens, a cross cylinder lens, a rotary prism, a wavefront modulation element, and the like. Of course, the optical member may be different from these. Also, for example, the eye refraction measurement unit may have a lens disk (e.g., lens disk 50) in which a plurality of optical members are arranged on the same circumference. In this case, the optical characteristics of the visual target light beam are changed by controlling a driving means (e.g., driving unit 52, driving unit 53, and the like) for controlling the lens disk.

[0016] <Changing the spherical refractive power of the target light beam> In this embodiment, the correction means may include a first correction means for changing the spherical refractive power of the visual target light beam using a variable optical element having a variable focal length, and a second correction means for changing the spherical refractive power of the visual target light beam by switching and positioning the optical element.

[0017] The first correcting means is configured to change the spherical refractive power of the visual target light beam by changing the focal length of the variable-focus component in a state where the variable-focus component is arranged in the optical path of the visual target light beam. For example, the first correcting means may arrange the variable-focus component in front of the eye to be examined by switching it. As an example, in this case, the variable-focus component may be provided on a lens disk of the eye refraction measurement unit. Also, for example, the first correcting means may arrange the variable-focus component fixedly in front of the eye to be examined. As an example, in this case, the variable-focus component may be always arranged in the test window of the eye refraction measurement unit. For example, the variable-focus component may be one or more. For example, the variable-focus component may be a variable-focus lens. At least one of a liquid lens, a liquid crystal lens, an Alvarez lens, and the like may be used as the variable-focus lens.

[0018] The first correcting means may be capable of changing the spherical refractive power of the visual target light beam within a first refractive power range using a variable-focus component, i.e., the spherical refractive power of the visual target light beam may be continuously changed using the variable-focus component.

[0019] The second correcting means is configured to change the spherical refractive power of the visual target light beam by switching an optical member arranged in the optical path of the visual target light beam. For example, the second correcting means may be arranged in front of the eye to be examined by switching the optical member. As an example, in this case, the optical member may be provided on a lens disk of the eye refractive power measuring unit. For example, the second optical element may be one or more. For example, the optical member may be a spherical lens. Note that, when a variable focus member is used as the optical member of the second correcting means, the focal length of the variable focus member may be a fixed distance.

[0020] The step in which the first correcting means can change the spherical refractive power of the visual target light beam may be configured to be smaller than the step in which the second correcting means can change the spherical refractive power of the visual target light beam. For example, the first correcting means may change the spherical refractive power of the visual target light beam in units of 0.25D or less, and the second correcting means may change the spherical refractive power of the visual target light beam in units of more than 0.25D. Of course, the value of the step of the spherical refractive power is an example and may be different. This allows the spherical refractive power of the visual target light beam to be continuously changed within the range of the first refractive power using the first correcting means. In addition, by using the first correcting means and the second correcting means in combination, it is possible to expand the spherical refractive power of the visual target light beam to a range of a composite spherical refractive power wider than the first refractive power, and the spherical refractive power of the visual target light beam can be continuously changed within the range of the composite refractive power.

[0021] The subjective eye examination device of this embodiment may include a determination means (for example, a control unit 70). The determination means determines whether or not to place an optical member of the second correcting means in front of the eye to be examined based on the modified spherical refractive power obtained by modifying the spherical refractive power of the visual target light beam. In other words, the determination means determines whether or not to place an optical member of the second correcting means in front of the eye to be examined based on the amount of spherical correction for correcting the eye to be examined, which can be changed by modifying the spherical refractive power of the visual target light beam. For example, the determination means may determine whether or not to place an optical member based on whether or not the modified spherical refractive power of the visual target light beam exceeds a predetermined threshold value set in advance. For example, the predetermined threshold value may be a fixed value, or the examiner may be able to set an arbitrary value. This allows the variable focus member of the first correcting means and the optical member of the second correcting means to be appropriately combined as necessary.

[0022] The determination means may determine whether or not to place an optical member of the second correcting means in front of the eye to be examined based on the modified spherical refractive power of the visual target light beam and the range of the first refractive power of the first correcting means. In this case, a threshold value of the modified spherical refractive power of the visual target light beam may be set based on the range of the first refractive power of the first correcting means. For example, the predetermined threshold value may be in a range from the maximum value to the minimum value of the first refractive power of the first correcting means. Also, for example, the predetermined threshold value may be in a range from a value around the maximum value to a value around the minimum value of the first refractive power of the first correcting means. As an example, the predetermined threshold value may be in a range from a value one step smaller than the maximum value of the first refractive power to a value one step larger than the minimum value. This makes it easy to grasp cases where the spherical refractive power of the visual target light beam cannot be adjusted by itself using the first correcting means, such as when the amount of spherical correction of the eye to be examined is a high number, and the variable focus member of the first correcting means and the optical member of the second correcting means can be appropriately combined.

[0023] The subjective eye examination device of this embodiment may include a control means (e.g., a control unit 70). The control means controls the correction means. For example, the control means controls the first correction means and the second correction means to change the spherical refractive power of the visual target light beam. For example, the spherical refractive power of the visual target light beam is changed to change the amount of spherical correction for correcting the test eye. As a result, the spherical refractive power of the visual target light beam changes seamlessly (without seams), so that the discomfort caused by the spherical refractive power of the visual target light beam switching from the first modified spherical refractive power to the second modified spherical refractive power different from the first modified spherical refractive power (in other words, the spherical correction amount of the test eye switching from the first spherical correction amount to the second spherical correction amount) is reduced, and the eye refractive power of the test eye can be measured with high accuracy.

[0024] The control means may place the variable-focus member of the first correction means in the optical path of the visual target light beam and change the focal length of the variable-focus member to change the spherical refractive power of the visual target light beam and change the amount of spherical correction of the subject's eye. For example, the control means may rotate the lens disk of the eye refraction measurement unit to place the variable-focus member on the lens disk in the test window (i.e., in the optical path of the visual target light beam). Also, for example, the control means may change the focal length of the variable-focus member in the test window of the eye refraction measurement unit.

[0025] The control means may change the spherical refractive power of the visual target light beam by disposing a predetermined optical member of the second correction means in the optical path of the visual target light beam, thereby changing the amount of spherical correction of the test eye. For example, the control means may rotate a lens disk of the eye refraction measuring unit to dispose an optical member on the lens disk in the test window (i.e., in the optical path of the visual target light beam).

[0026] For example, when the spherical refractive power of the visual target light beam is changed by the variable-focus member of the first correcting means, the variable-focus member of the first correcting means may be arranged in the optical path of the visual target light beam, and the optical member of the second correcting means may be removed from the optical path of the visual target light beam, and the variable-focus member may be changed to a predetermined focal length. Also, when the spherical refractive power of the visual target light beam is changed by the optical member of the second correcting means, the variable-focus member of the first correcting means may be removed from the optical path of the visual target light beam, and the optical member of the second correcting means may be arranged in the optical path of the visual target light beam. Alternatively, the variable-focus member may be changed to a focal length that is 0D, and the variable-focus member may be changed to a focal length that is 0D, and the variable-focus member of the first correcting means may be changed to a focal length that is 0D, and the optical member of the second correcting means may be changed to a focal length that is 0D. Alternatively, when the spherical refractive power of the visual target light beam is changed by the optical member of the second correcting means, the variable-focus member of the first correcting means may be changed to a focal length that is 0D, and the variable-focus member of the second correcting means may be changed to a focal length that is 0D, and the variable-focus member of the second correcting means may be changed to a focal length that is 0D. Alternatively, when the spherical refractive power of the visual target light beam is changed by the optical member of the second correcting means, the variable-focus member of the first ...

[0027] Of course, for example, when the spherical refractive power of the visual target light beam is changed by combining the variable-focus component of the first correcting means and the optical component of the second correcting means, the variable-focus component may be changed to a predetermined focal length while both the variable-focus component and the optical component are disposed in the optical path of the visual target light beam. By combining the variable-focus component and the optical component, the spherical refractive power of the visual target light beam can be changed significantly. Therefore, even if the spherical correction amount of the test eye is large, the eye refractive power of the test eye can be measured with high accuracy.

[0028] The control means may arrange at least the optical member of the second correcting means based on the modified spherical refractive power obtained by changing the spherical refractive power of the visual target light beam. That is, the control means may arrange only the optical member of the second correcting means based on the modified spherical refractive power of the visual target light beam, or may adjust the variable focus member of the first correcting means and arrange the optical member of the second correcting means.

[0029] For example, the control means may control at least the second correcting means to switch and place the optical member when the modified spherical refractive power of the visual target light beam exceeds the range of the first refractive power of the first correcting means. In other words, at least the optical member may be placed when the modified spherical refractive power of the visual target light beam exceeds the maximum value of the first refractive power of the first correcting means or exceeds the minimum value of the first refractive power. Also, for example, the control means may place at least the optical member when the modified spherical refractive power of the visual target light beam is within the range of the first refractive power of the spherical refractive power of the first correcting means and exceeds a value around the maximum value of the first refractive power or exceeds a value around the minimum value of the first refractive power.

[0030] The control means may adjust the variable-focus member of the first correcting means by using a table or a calculation formula in which the changed spherical refractive power of the visual target light beam corresponds to the first refractive power of the first correcting means. The control means may also set whether or not to place the optical member of the second correcting means by using a table or a calculation formula in which the changed spherical refractive power of the visual target light beam corresponds to the second refractive power of the second correcting means. Of course, the control means may adjust the variable-focus member of the first correcting means and set whether or not to place the optical member of the second correcting means by using a table or a calculation formula in which the changed spherical refractive power of the visual target light beam corresponds to the first refractive power of the first correcting means and the second refractive power of the second correcting means. For example, such a table may be obtained in advance by experiments or simulations and stored in the storage means.

[0031] The control means may control at least the second correcting means based on the judgment result of the judgment means described above, and may switch and arrange the optical members. For example, when the control means obtains a judgment result that the change amount of the spherical refractive power of the visual target light beam does not exceed a predetermined threshold, the control means may control the first correcting means and generate a predetermined spherical refractive power using a variable focus member. Also, for example, when the control means obtains a judgment result that the change amount of the spherical refractive power of the visual target light beam exceeds a predetermined threshold, the control means may control at least the second correcting means and generate a predetermined spherical refractive power using at least an optical member. Note that, both the first correcting means and the second correcting means may be controlled according to the change amount of the spherical refractive power of the visual target light beam, and a predetermined spherical refractive power may be generated using a variable focus member and an optical member. This allows the eye refractive power of the test eye to be measured with high accuracy.

[0032] When the control means adjusts the changed spherical refractive power of the visual target light beam from the first changed spherical refractive power to the second changed spherical refractive power different from the first changed spherical refractive power, the control means may control only the first correcting means and change the focal length of the variable-focus member according to the change amount between the first changed spherical refractive power and the second changed spherical refractive power. For example, when the change amount between the first changed spherical refractive power before changing the spherical refractive power of the visual target light beam and the second changed spherical refractive power after changing is equal to or less than a predetermined threshold, the control means may control only the first correcting means. Also, when the change amount between the first changed spherical refractive power and the second changed spherical refractive power exceeds a predetermined threshold, the control means may control the first correcting means and the second correcting means, or only the second correcting means. For example, the predetermined threshold may be a fixed value, or the examiner may be able to set an arbitrary value. This allows the spherical correction power required for correction of the subject's eye to be easily adjusted and the eye refractive power of the subject's eye to be measured smoothly.

[0033] <Changing the cylindrical refractive power and cylinder axis angle of the target beam> In this embodiment, the correction means may have a Stokes lens including a first cylindrical lens and a second cylindrical lens that can be rotated independently in front of the eye to be examined. For example, the correction means may be capable of continuously changing the cylindrical refractive power of the visual target light beam by rotating the first cylindrical lens and the second cylindrical lens separately to change the relative angle of the astigmatism axis of each cylindrical lens. Also, for example, the correction means may be capable of continuously changing the astigmatism axis angle of the visual target light beam by rotating the first cylindrical lens and the second cylindrical lens integrally to change the composite axis angle of each cylindrical lens. For example, the first cylindrical lens and the second cylindrical lens may be composed of two positive cylindrical lenses having the same focal length, or may be composed of a positive and a negative cylindrical lens having the same focal length.

[0034] The correction means may have a correction optical member for correcting the deviation of the spherical correction of the subject's eye, which deviation occurs when the first cylindrical lens and the second cylindrical lens are aligned with a composite axis angle. For example, the correction optical member may be a member capable of changing the spherical refractive power of the visual target light beam. As an example, at least one of a variable-focus member with a variable focal length, an optical member with a fixed focal length, and the like may be used. Also, for example, the correction optical member may be one or more.

[0035] For example, the correction means may switch between and place a correction optical member in front of the eye to be examined. As an example, in this case, a correction optical member may be provided on a lens disk of the eye refraction measurement unit. Such a correction optical member may be at least one of a variable focus member (e.g., a variable focus lens), an optical member (e.g., a spherical lens), and the like. Also, for example, the correction means may fixedly place a correction optical member in front of the eye to be examined. As an example, in this case, a correction optical member may always be placed in an examination window of the eye refraction measurement unit. Such a correction optical member may be a variable focus member (e.g., a variable focus lens).

[0036] The correction means may have a correction optical element for correcting the amount of spherical correction of the subject's eye. For example, the correction optical element may be an element capable of changing the spherical refractive power of the visual target light beam. As an example, at least one of a variable-focus element with a variable focal length, an optical element with a fixed focal length, etc. may be used. Also, for example, the correction optical element may be one or more.

[0037] For example, the correcting means may switch between and place a corrective optical element in front of the eye to be examined. As an example, in this case, a corrective optical element may be provided on a lens disk of the eye refraction measurement unit. Such a corrective optical element may be at least one of a variable focus element (e.g., a variable focus lens), an optical element (e.g., a spherical lens), and the like. Also, for example, the correcting means may fixedly place a corrective optical element in front of the eye to be examined. As an example, in this case, a corrective optical element may always be placed in an examination window of the eye refraction measurement unit. Such a corrective optical element may be a variable focus element (e.g., a variable focus lens).

[0038] In this embodiment, a corrective optical element for correcting the deviation in the amount of spherical correction caused by aligning the first cylindrical lens and the second cylindrical lens of the Stokes lens to a composite axis angle may be used in combination with a corrective optical element for adjusting the amount of spherical correction for correcting the test eye.

[0039] In addition, in this embodiment, the correction optical element for correcting the deviation of the spherical correction amount of the subject's eye may be combined with the variable-focus element of the first correcting means, the focal length of which is variable, or the correction optical element for correcting the deviation of the spherical correction amount of the subject's eye may be combined with the optical element of the second correcting means. Similarly, in this embodiment, the correction optical element for adjusting the spherical correction amount of the subject's eye may be combined with the variable-focus element of the first correcting means, the focal length of which is variable, or the correction optical element for adjusting the spherical correction amount of the subject's eye may be combined with the optical element of the second correcting means. This makes it possible to easily adjust the spherical correction amount of the subject's eye.

[0040] The subjective optometry device of this embodiment may include an acquisition means (e.g., a control unit 70). The acquisition means acquires at least a cylindrical correction amount and an astigmatic axis correction amount for the subject's eye. For example, the acquisition means may acquire a cylindrical correction amount and an astigmatic axis correction amount based on a refractive power (objective value) objectively measured for the subject's eye. Also, for example, the acquisition means may acquire a cylindrical correction amount and an astigmatic axis correction amount based on a refractive power (subjective value) subjectively measured for the subject's eye. As an example, the subjective value of the subject's eye may be a corrected refractive power (perfect correction value) closest to the plus side at which the subject's eye has the best visual acuity, a corrected refractive power (prescription value) at which the subject's eye has a predetermined visual acuity, or the like. Of course, the acquisition means may acquire a spherical correction amount for the subject's eye together with the cylindrical refractive power and astigmatic axis angle of the subject's eye.

[0041] For example, the acquiring means may acquire the amount of cylindrical correction and the amount of astigmatic axis correction input by the examiner operating the operating means (e.g., the examiner controller 10). Also, for example, the acquiring means may read an identifier for each subject and acquire the amount of cylindrical correction and the amount of astigmatic axis correction stored in the identifier. As an example, the identifier may be an ID, a character string, a one-dimensional code, a two-dimensional code, a color code, or the like. Also, for example, the acquiring means may acquire the amount of cylindrical correction and the amount of astigmatic axis correction by receiving data measured using a device other than the subjective optometry device of this embodiment.

[0042] The subjective optometry device of this embodiment may include an add power acquisition means (e.g., a control unit 70). The add power acquisition means acquires an add power for a correction amount at a predetermined examination distance of the subject's eye. For example, the add power may be a power based on at least one of the refractive power, accommodative power, age, etc. of the subject's eye.

[0043] For example, the add power acquisition means may acquire the add power input by the examiner operating the operation means. Also, for example, the add power acquisition means may read an identifier for each examinee and acquire the add power stored in the identifier. Also, for example, the add power acquisition means may acquire the add power by receiving data measured using a device other than the subjective optometry device of this embodiment.

[0044] The subjective optometry device of this embodiment may include a control means. The control means may be the same as that described in the above section "Changing the spherical refractive power of the visual target light beam." Of course, it is also possible to provide a different control means separately.

[0045] The control means may control the correction means in an addition power test that measures the addition power for the correction amount at a predetermined test distance of the eye to be examined. That is, the control means may control the Stokes lens in the addition power test. For example, the control means may change the composite axis angle of the first cylindrical lens and the second cylindrical lens to a predetermined axis angle based on the cylindrical correction amount and the astigmatism axis correction amount acquired by the acquisition means. For example, such a composite axis angle may be an axis angle that takes into account the deviation amount of the astigmatism axis angle that occurs when an optical member and a cross cylinder lens are assumed to be arranged in order to correct the eye to be examined with the cylindrical correction amount and the astigmatism axis correction amount. Note that the optical member here may be an optical member (for example, a cylindrical lens) that can adjust at least one of the cylindrical correction amount and the astigmatism axis correction amount of the eye to be examined by changing at least one of the cylindrical refractive power and the astigmatism axis angle of the visual target light beam. This allows the cylindrical refractive power and the cylindrical axis angle of the visual target light beam to change seamlessly (without seams), so that the cylindrical refractive power of the visual target light beam is switched from the first changed cylindrical refractive power to the second changed cylindrical refractive power different from the first changed cylindrical refractive power (in other words, the cylindrical correction amount of the test eye is switched from the first changed cylindrical correction amount to the second changed cylindrical correction amount), which reduces the discomfort, and the eye refractive power of the test eye can be measured with high accuracy. Similarly, the cylindrical axis angle of the visual target light beam is switched from the first changed cylindrical axis angle to the second changed cylindrical axis angle different from the first changed cylindrical axis angle (in other words, the astigmatism axis correction amount of the test eye is switched from the first changed cylindrical axis correction amount to the second changed cylindrical correction amount), which reduces the discomfort, and the eye refractive power of the test eye can be measured with high accuracy.

[0046] The control means may correct the deviation of the spherical correction amount of the test eye by placing a correction optical element in front of the test eye. In other words, the control means may correct the deviation of the spherical correction amount of the test eye by placing a correction optical element in the optical path of the visual target light beam and changing the spherical refractive power of the visual target light beam. For example, the control means may rotate the lens disk of the eye refraction measurement unit to place a variable focus element on the lens disk in the test window as the correction optical element and change the focal length of the variable focus element. Also, for example, the control means may rotate the lens disk of the eye refraction measurement unit to place an optical element on the lens disk in the test window as the correction optical element. Thereby, the spherical correction amount of the test eye is appropriately corrected by the correction optical element.

[0047] The control means may use a variable-focus component with a variable focal length as a correction optical component, and change the spherical refractive power of the variable-focus component to correct the deviation in the spherical correction of the subject's eye. For example, since the deviation in the spherical correction caused by the adjustment of the Stokes lens is small, the variable-focus component can be used to finely adjust it to improve the accuracy of the correction.

[0048] The control means may set the composite axis angle using a table or a formula that associates the cylindrical correction amount and the astigmatism axis correction amount of the subject's eye with the composite axis angle between the first cylindrical lens and the second cylindrical lens. The control means may also place the correction optical member using a table or a formula that associates the cylindrical correction amount and the astigmatism axis correction amount of the subject's eye with the deviation amount of the astigmatism axis correction amount associated with the setting of the composite axis angle between the first cylindrical lens and the second cylindrical lens. Of course, the control means may execute the setting of the composite axis angle and the placement of the correction optical member using a table or a formula that associates the cylindrical correction amount and the astigmatism axis correction amount of the subject's eye with the composite axis angle between the first cylindrical lens and the second cylindrical lens and the deviation amount of the astigmatism axis correction amount associated with the setting of the composite axis angle. For example, such a table may be obtained in advance by an experiment or a simulation and stored in the storage means.

[0049] The control means may switch between a first state in which the first cylindrical lens and the second cylindrical lens are aligned with a composite axis angle and a second state in which a corrective optical element based on the addition power is further arranged in the first state. For example, the control means may switch from the first state to the second state by switching and arranging a corrective optical element in the optical path of the visual target light beam and changing the spherical refractive power of the visual target light beam. For example, the control means may rotate a lens disk of the eye refraction measurement unit to arrange a variable focus element on the lens disk in the test window as a corrective optical element and change the focal length of the variable focus element. Also, for example, the control means may rotate a lens disk of the eye refraction measurement unit to arrange an optical element on the lens disk in the test window as a corrective optical element. Thereby, the spherical correction amount of the test eye is appropriately corrected by the corrective optical element. Since the state in which the additional power is not applied to the eye to be examined and the state in which the additional power is applied to the eye to be examined are switched with the deviation amount of the spherical correction of the eye to be examined corrected, the optimal additional power for the eye to be examined can be measured with high accuracy.

[0050] 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 may 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 may read and execute the program.

[0051] <Example> An example of a subjective optometry device in this embodiment will be described. Fig. 1 is an external view of the subjective optometry device 100. Fig. 1(a) shows a state in which an eye refraction measurement unit 40 is supported in a standby position. Fig. 1(b) shows a state in which the eye refraction measurement unit 40 is supported in a measurement position. For example, the subjective optometry device 100 includes a housing 1, a presentation window 2, a holding unit 4, an examiner controller 10, an eye refraction measurement unit 40, and the like.

[0052] The housing 1 has a light projection optical system 30 inside. The presentation window 2 transmits the visual target light beam from the light projection optical system 30. The visual target light beam is projected onto the subject's eye E through the presentation window 2. When an eye refractive power measuring unit 40 is disposed between the subject's eye E and the presentation window 2 (see FIG. 1(b)), the visual target light beam is projected onto the subject's eye E through the presentation window 2 and a test window 43, which will be described later. In this way, a test visual target is presented to the subject's eye E.

[0053] The holding unit 4 holds the eye refraction measuring unit 40. For example, the holding unit 4 moves an arm by driving a driving unit (motor or the like) not shown, thereby moving the eye refraction measuring unit 40 connected to the arm. This allows the eye refraction measuring unit 40 to be switched between a standby position and a measurement position.

[0054] The examiner's controller 10 is used by the examiner to operate the subjective optometry device 100. The examiner's controller 10 includes a switch unit 11, a monitor 12, and the like. The switch unit 11 inputs signals for performing various settings (e.g., selection of an optotype to be presented to the examinee, etc.). The monitor 12 displays various information (e.g., measurement results of the examinee's eye E, etc.). The monitor 12 may function as a touch panel that also serves as the switch unit 11. Signals from the examiner's controller 10 are output to the control unit 60 by wired communication or wireless communication.

[0055] <Light projection optical system> Fig. 2 is a schematic diagram of the light projection optical system 30. Fig. 2(a) shows the optical arrangement during a distance test. Fig. 2(b) shows the optical arrangement during a near test. The light projection optical system 30 projects a visual target light beam toward the subject's eye E. For example, the light projection optical system 30 includes a display 31, a plane mirror 32, a concave mirror 33, a near / far switcher 34, and the like.

[0056] The display 31 displays a visual target (e.g., a fixation target, a test visual target, etc.). A visual target light beam emitted from the display 31 forms an image on the fundus of the subject's eye E, thereby presenting the visual target to the subject's eye E. For example, the display 31 may be an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), a plasma display, etc.

[0057] The plane mirror 32 reflects the visual target light beam from the display 31 and guides it to the concave mirror 33. The plane mirror 32 also reflects the visual target light beam from the display 31 and guides it to the subject's eye E. For example, the plane mirror 32 is disposed so that the distance (presentation distance) from the subject's eye E to the display 31 during a near vision test of the subject's eye E is optically 40 cm. Note that instead of the plane mirror 32, it is also possible to use a reflecting member such as a prism, a beam splitter, or a half mirror.

[0058] The concave mirror 33 reflects the visual target light beam from the display 31 and guides it to the plane mirror 32. For example, the concave mirror 33 is disposed so that the distance (presentation distance) from the subject's eye E to the display 31 during a distance test of the subject's eye E is optically 5 m. Note that instead of the concave mirror 33, it is also possible to use a reflective member such as an aspheric mirror or a free-form mirror. Also, instead of the concave mirror 33, it is also possible to use a lens or the like.

[0059] The far / near switching unit 34 switches the arrangement of the display 31 between a distance test and a near test of the subject's eye E. For example, the far / near switching unit 34 moves the holding unit by driving a drive unit (motor or the like) not shown, thereby moving the display 31 held by the holding unit. This allows the display 31 to be switched between a distance arrangement and a near arrangement.

[0060] For example, during a distance test of the subject's eye E, the display screen of the display 31 is directed toward the back of the housing 1 (see FIG. 2(a)). The visual target light beam from the display 31 passes through the optical axis L1 and enters the plane mirror 32, where it is reflected in the direction of the optical axis L2. It also passes through the optical axis L2 and enters the concave mirror 33, where it is reflected in the direction of the optical axis L3. It also passes through the optical axis L3 and enters the plane mirror 32, where it is reflected in the direction of the optical axis L4. As a result, the visual target light beam that has passed through each optical member inside the housing 1 and is emitted to the outside of the housing 1 is projected onto the subject's eye E.

[0061] For example, during a near vision test of the subject's eye E, the display screen of the display 31 is directed toward the upper surface of the housing 1 (see FIG. 2(b)). The visual target light beam from the display 31 passes through the optical axis L3 and enters the plane mirror 32, and is reflected by the plane mirror 32 in the direction of the optical axis L4. As a result, the visual target light beam that has passed through each optical member inside the housing 1 and is emitted to the outside of the housing 1 is projected onto the subject's eye E.

[0062] <Eye refractive power measurement unit (corrective optical system)> 3 is a schematic diagram of the eye refraction measuring unit 40. The eye refraction measuring unit 40 subjectively measures the refractive power of the subject's eye E. The eye refraction measuring unit 40 is also used as a correction optical system. The correction optical system is disposed in the optical path of the projection optical system 30, and changes the optical characteristics of the visual target light beam. For example, the eye refraction measuring unit 40 includes a forehead rest 41, a lens unit 42, an examination window 43, a moving unit 44, and the like.

[0063] The forehead rest 41, by placing the subject's forehead against it, fixes the subject's eye E at a predetermined examination position and maintains a constant distance from the subject's eye E to the examination window 43. The lens unit 42 has a pair of left and right lens units 42L and 42R. The lens unit 42 has an examination window 43 (a left examination window 43L and a right examination window 43R).

[0064] The moving unit 44 adjusts the distance between the left lens unit 42L and the right lens unit 42R, and the convergence angle (inward angle) between the left lens unit 42L and the right lens unit 42R. For example, the moving unit 44 adjusts the distance between the left lens unit 42L and the right lens unit 42R by driving the driving unit 45 (left driving unit 45L and right driving unit 45R). Also, for example, the moving unit 44 adjusts the convergence angle between the left lens unit 42L and the right lens unit 42R by driving the driving unit 46. For a detailed configuration of the moving unit 44, please refer to, for example, Japanese Patent Application Laid-Open No. 2004-329345.

[0065] FIG. 4 is a schematic diagram of the lens unit 42. FIG. 4(a) is a diagram showing the internal configuration of the lens unit 42. FIG. 4(b) is a horizontal cross-sectional view of the lens unit 42. Note that FIGS. 4(a) and 4(b) only show the left lens unit 42L, and omit the right lens unit 42R. For example, the lens unit 42 includes a variable-focus lens 61, a Stokes lens 62, and a lens disk 50.

[0066] The variable-focus lens 61 is fixedly disposed within the lens unit 42. The variable-focus lens 61 adjusts the spherical refractive power according to the magnitude of the applied voltage, and can generate a spherical refractive power that changes continuously within a predetermined range by changing the focal position. For example, in this embodiment, it is possible to generate a spherical refractive power of -5.00D to +5.00D.

[0067] The Stokes lens 62 is rotatably disposed within the lens unit 42. The Stokes lens 62 is composed of two cylindrical lenses 62a and 62b. For example, the cylindrical lenses 62a and 62b are a positive cylindrical lens and a negative cylindrical lens with the same focal length. Note that the cylindrical lenses 62a and 62b may also be two positive cylindrical lenses with the same focal length.

[0068] The cylindrical lens 62a and the cylindrical lens 62b are rotated independently around the optical axis L4 by driving the rotation mechanisms 63a and 63b, respectively. By changing the rotation angle of at least one of the cylindrical lens 62a and the cylindrical lens 62b and providing a difference in the axial angle of each cylindrical lens, it is possible to generate a cylindrical refractive power that changes continuously within a predetermined range. For example, in this embodiment, it is possible to generate a cylindrical refractive power of -10.00D to +10.00D. In addition, by integrally changing the rotation angles of the cylindrical lens 62a and the cylindrical lens 62b while maintaining the difference in the axial angle between them (i.e., by changing the composite axial angle of the cylindrical lens 62a and the cylindrical lens 62b), it is possible to adjust the cylindrical axial angle that changes continuously within a predetermined range. For example, in this embodiment, it is possible to adjust the cylindrical axial angle of 1 degree to 180 degrees.

[0069] The lens disk 50 has an opening (or a 0D lens) and multiple optical elements 51 on the same circumference. The lens disk 50 is rotated about the disk center by driving a drive unit 52. Also, each optical element 51 is rotated about an optical axis L4 by driving a drive unit 53. In this way, the desired optical element 51 is switched and positioned in the inspection window 43 at the desired angle.

[0070] The lens disk 50 is composed of one lens disk or multiple lens disks. For example, in this embodiment, a first auxiliary lens disk 50a and a second auxiliary lens disk 50b are provided. The first auxiliary lens disk 50a is provided with a polarizing filter, a red filter / green filter, a dispersion prism, a Maddox lens, etc. as the optical element 51. The second auxiliary lens disk 50b is provided with a plain lens, a rotary prism, an autocross cylinder lens, a first spherical lens 51a, a second spherical lens 51b, etc. as the optical element 51. For example, the plain lens is provided with a mark for aligning the interpupillary distance of the subject's eye E. For example, the first spherical lens 51a is a lens having a spherical power that is converted to -10.00D when the eyeglasses are worn. For example, the second spherical lens 51b is a lens having a spherical power that is converted to +10.00D when the eyeglasses are worn. For example, the spherical refractive power of the first spherical lens 51 a and the second spherical lens 51 b is greater than a predetermined range of the spherical refractive power of the variable-focus lens 61 .

[0071] In this embodiment, the eyeglasses wearing position is the position where the eyeglass lenses are assumed to be placed in front of the test eye E when the subject wears the eyeglasses, and is the position of the optical element (i.e., the variable focus lens 61) closest to the test eye E. More specifically, it is the position G of the rear surface of the variable focus lens 61. The distance from the corneal apex position of the test eye E to the position of the variable focus lens 61 (position G of the rear surface of the variable focus lens 61) can be considered as the corneal vertex distance VD.

[0072] <Spherical power adjustment range> In this embodiment, when the variable-focus lens 61 is combined with either the first spherical lens 51a or the second spherical lens 51b, the range of spherical refractive power that can be adjusted by the variable-focus lens 61 alone can be expanded. For example, by setting the variable-focus lens 61 to any of 0D to -5.00D and combining it with the first spherical lens 51a (-10.00D), it is possible to generate a spherical refractive power of -10.00D to -15.00D. For example, by setting the variable-focus lens 61 to any of 0D to +5.00D and combining it with the second spherical lens 51b (+10.00D), it is possible to generate a spherical refractive power of +10.00D to +15.00D.

[0073] That is, in this embodiment, it is possible to seamlessly generate a spherical refractive power of -5.00D to +5.00D using only the variable-focus lens. Also, by disposing the first spherical lens 51a or the second spherical lens 51b in the test window 43 in addition to the variable-focus lens 61, it is possible to seamlessly generate a spherical refractive power of -10.00D to -15.00D and a spherical refractive power of +10.00D to +15.00D. Therefore, as a whole, it is possible to seamlessly generate a spherical refractive power of -15.00D to +15.00D.

[0074] For example, the spherical correction amount of the test eye E, the spherical refractive power of the variable-focus lens 61, and the spherical refractive power of the first spherical lens 51a and the second spherical lens 51b may be associated in advance. For example, when the spherical correction amount of the test eye E exceeds the spherical refractive power that can be adjusted by the variable-focus lens 61, the first spherical lens 51a and the second spherical lens 51b may generate a spherical refractive power (in other words, the first spherical lens 51a or the second spherical lens 51b may be arranged). As an example, a reference table or the like for referring to the value of the spherical refractive power of the variable-focus lens 61 and the value of the spherical refractive power of the first spherical lens 51a and the second spherical lens 51b based on the spherical correction amount of the test eye E may be prepared in advance and stored in the memory 75.

[0075] <Reproduction of the cross cylinder lens arrangement> Here, a lens unit provided in a conventional eye refractive power measuring unit will be briefly described. Fig. 5 is a schematic diagram of a conventional lens unit 200. Fig. 5(a) is a diagram showing the internal configuration of the conventional lens unit 200. Fig. 5(b) is a horizontal cross-sectional view of the conventional lens unit 200. Note that Figs. 5(a) and 5(b) only show the left lens unit, and omit the right lens unit.

[0076] The lens unit 200 includes a plurality of lens disks 210. For example, a strong spherical lens disk 210a, a weak spherical lens disk 210b, a strong cylindrical lens disk 210c, a weak cylindrical lens disk 210d, a first auxiliary lens disk 210e, and a second auxiliary lens disk 210f are provided in a direction away from the subject's eye E. The strong spherical lens disk 210a includes spherical lenses of -18.00D to +15.00D at intervals of 3.00D. The weak spherical lens disk 210b includes spherical lenses of -1.00D to +1.75D at intervals of 0.25D. The strong cylindrical lens disk 210c includes cylindrical lenses of -1.50D to -7.50D at intervals of 1.50D, calculated based on the eyeglass wearing position. The weak cylindrical lens disk 210d is provided with cylindrical lenses of -0.25D to -1.25D at 0.25D intervals, calculated based on the eyeglass wearing position. The first auxiliary lens disk 210e is provided with a polarizing filter, a red filter / green filter, a dispersion prism, a Maddox lens, etc. The second auxiliary lens disk 210f is provided with a plain lens, a rotary prism, an autocross cylinder lens, a cross cylinder lens, etc. For details of the lens unit 200, please refer to, for example, Japanese Patent Application Laid-Open No. 2007-125125.

[0077] The conventional lens unit 200 is provided with a strong cylindrical lens disk 210c, a weak cylindrical lens disk 210d, and a cross cylinder lens. For example, the cross cylinder lens is a lens in which cylindrical lenses with the same cylindrical refractive power but different signs are combined so that their cylindrical axis angles are orthogonal. As an example, it is a lens in which cylindrical lenses of -0.25D and +0.25D are combined so that their cylindrical axis angles are orthogonal. On the other hand, the lens unit 42 of this embodiment has a Stokes lens 62 (cylindrical lens 62a and cylindrical lens 62b) instead of the strong cylindrical lens disk 210c and the weak cylindrical lens disk 210d, and does not have a cross cylinder lens.

[0078] 6 is a diagram showing the change in the composite refractive power of the cylindrical lens and the cross cylinder lens of the cylindrical lens disk in the conventional lens unit 200. For example, the cylindrical lens 250 of the weak cylindrical lens disk 210d is switched and placed in front of the eye E to be examined. As an example, the cylindrical lens 250 is a lens with a cylindrical refractive power of -1.00D, and is rotated so that its cylindrical axis angle is 135 degrees. At this time, the refractive power of the cylindrical lens 250 changes according to a sine curve α that passes through -0.50D at 0 degrees, 90 degrees, and 180 degrees, -1.00D at 45 degrees, and 0.00D at 135 degrees.

[0079] Also, for example, the cross cylinder lens 260 of the first auxiliary lens disk 210e is switched and placed in front of the subject's eye E. As an example, the cross cylinder lens 260 is rotated so that +0.25D becomes 90 degrees. At this time, the refractive power of the cross cylinder lens 260 changes according to a sine curve β that passes through -0.25D at 0 degrees and 180 degrees, 0.00D at 45 degrees and 135 degrees, and +0.25D at 90 degrees.

[0080] For example, when the cylindrical lens 250 and the cross cylinder lens 260 are switched and placed in front of the eye E, a composite refractive power is generated by combining the refractive powers of the respective lenses. At this time, the composite refractive power changes according to a sine curve γ passing through -0.75D, -1.00D, -0.25D, 0.00D, and -0.75D in the order of 0 degrees, 45 degrees, 90 degrees, 135 degrees, and 180 degrees. For example, the sine curve α of the refractive power of the cylindrical lens 250 has a vertex at 135 degrees, whereas the sine curve γ of the composite refractive power of the cylindrical lens 250 and the cross cylinder lens 260 has a vertex shifted to a position of 122 degrees.

[0081] In this embodiment, by setting the composite axis angle of the cylindrical lenses 62a and 62b in the Stokes lens 62 in consideration of the deviation of the astigmatic axis angle that occurs when the cylindrical lens 250 and the cross cylinder lens 260 are assumed to be arranged, it is possible to create a state in which the cylindrical lens 250 and the cross cylinder lens 260 are arranged using only the Stokes lens 62. For example, the arrangement of the cylindrical lens 250 and the cross cylinder lens 260 described above can be reproduced by adjusting the difference in the axis angles of the cylindrical lenses 62a and 62b to a difference that generates a cylindrical refractive power of -1.00D, and arranging the composite axis angle of the cylindrical lenses 62a and 62b to a position of 122 degrees instead of 135 degrees.

[0082] For example, the cylindrical correction amount and the astigmatic axis angle of the subject's eye E may correspond to the composite axis angle of the cylindrical lens 62a and the cylindrical lens 62b in advance. As an example, a reference table for referencing the values ​​of the astigmatic axis angles of the cylindrical lens 62a and the cylindrical lens 62b based on the cylindrical correction amount and the astigmatic axis correction amount of the subject's eye E may be prepared in advance and stored in the memory 75.

[0083] In the conventional lens unit 200, when the spherical lens, the cylindrical lens 250, and the cross cylinder lens 260 are arranged in front of the eye E, the equivalent spherical value of the eye E is taken into consideration. For example, when the cylindrical refractive power is changed by 0.25D (1 step) by switching the cylindrical lens 250, the spherical refractive power is generated by 0.125D. For example, when the spherical lenses are provided at intervals of 0.25D, when the cylindrical refractive power is changed by 0.50D (2 steps), the spherical refractive power can be changed by switching the spherical lens by 0.25D, and correction taking into consideration the equivalent spherical value is performed. In this embodiment, by using the variable focus lens 61, correction taking into consideration the change in the spherical refractive power due to the change in the cylindrical refractive power can be easily performed. In addition, when the cylindrical refractive power is changed finely by the Stokes lens 62, the spherical refractive power changes in various ways, but even in such a case, correction can be easily performed.

[0084] <Control Unit> 7 is a schematic diagram of a control system of the subjective optometry device 100. For example, the control unit 70 includes a CPU (processor), RAM, ROM, etc. The CPU controls the driving of each part in the subjective optometry device 100. Various information is temporarily stored in the RAM. Various programs executed by the CPU are stored in the ROM. The control unit 70 may be composed of multiple control units (i.e., multiple processors).

[0085] The control unit 70 is connected to the display 31, the examiner's controller 10, a non-volatile memory 75 (hereinafter, memory 75), etc. Also connected to the control unit 70 are a drive unit for the holding unit 4, a drive unit for the near / far switching unit 34, a drive unit for the eye refractive power measuring unit 40 (drive units 45, 46, 52, 53), etc.

[0086] The memory 75 is a non-transitory storage medium that can retain its stored contents even if the power supply is cut off. For example, the memory 75 may be a hard disk drive, a flash ROM, a USB memory, or the like.

[0087] <Control action> The control operation of the subjective optometry apparatus 100 will be described.

[0088] The examiner adjusts the position of the forehead rest 170 by operating a forehead rest adjustment knob (not shown) so that the corneal vertex distance VD of the subject's eye E becomes a predetermined distance (e.g., 12 mm). The examiner also operates the examiner's controller 10 to input the interpupillary distance of the subject's eye. The control unit 70 adjusts the spacing of the lens units 42 to match the examination window 43 to the interpupillary distance.

[0089] <Setting the initial correction amount> The examiner operates the examiner's controller 10 to input the objective ocular refractive power (objective value) previously obtained by objective measurement of the subject's eye E as the initial correction amount of the subject's eye E. That is, the initial spherical correction amount, the initial cylindrical correction amount, and the initial astigmatism axis correction amount are input. Based on the above-mentioned reference table, the control unit 70 applies an applied voltage to the variable-focus lens 61 and rotates the Stokes lens 62 and the lens disk 50. The variable-focus lens 61, the Stokes lens 62, and the lens disk 50 may be controlled in sequence or substantially simultaneously.

[0090] In this embodiment, the objective refractive power (objective value) of the subject's eye E is exemplified as follows: spherical refractive power -6.50D, cylindrical refractive power -1.00D, and astigmatic axis angle 135 degrees. In this case, the spherical correction amount -6.50D, cylindrical correction amount -1.00D, and astigmatic axis correction amount 135 degrees may be input as the initial correction amount of the subject's eye E. For example, the control unit 70 adjusts the spherical refractive power of the variable-focus lens 61 to +3.50D. Also, for example, the control unit 70 changes the difference between the axial angles of the cylindrical lens 62a and the cylindrical lens 62b to adjust the cylindrical refractive power to -1.00D. Also, for example, the control unit 70 adjusts the composite axial angle of the cylindrical lens 62a and the cylindrical lens 62b to 135 degrees. Also, for example, the control unit 70 places in the inspection window 43 the opening of the first auxiliary lens disk 50a and the first spherical lens 51a (spherical refractive power −10.00D) of the second auxiliary lens disk 50b.

[0091] This corrects the eye E so that the visual target light beam from the display 31 is focused on the retina of the eye E. That is, the eye E is corrected with a spherical correction amount of −6.50, which is a combination of the variable-focus lens 61 and the first spherical lens 51a. The eye E is also corrected with a cylindrical correction amount of −1.0D and an astigmatism axis correction amount of 135 degrees by the Stokes lens 62.

[0092] <Distance vision test> After correcting the eye E with the initial correction amount, the examiner operates the examiner controller 10 to start a distance visual acuity test of the eye E at a predetermined distance (here, the distance test distance). The control unit 70 switches the display 31 to a distance arrangement. The control unit 70 also causes the display 31 to display a Landolt ring target having a predetermined visual acuity value as an initial target. As an example, a Landolt ring target having a visual acuity value of 0.8 is displayed as the initial target.

[0093] The examiner operates the examiner controller 10 to switch the Landolt ring and ask the subject which direction the gap of the ring of the Landolt ring is. For example, if the answer of the subject is correct, the visual acuity value of the Landolt ring is switched to a visual acuity value one step higher. That is, the increment of the visual acuity value of the Landolt ring is increased by one, and the value is switched to a value larger than the current value. As an example, the visual acuity value of the Landolt ring is switched from 0.8 to 0.9. For example, if the answer of the subject is incorrect, the visual acuity value of the Landolt ring is switched to a visual acuity value one step lower. That is, the increment of the visual acuity value of the Landolt ring is decreased by one, and the value is switched to a value smaller than the current value. As an example, the visual acuity value of the Landolt ring is switched from 0.8 to 0.7. The examiner repeats these procedures to obtain the highest visual acuity value of the Landolt ring that the subject's eye E can read.

[0094] Next, the examiner operates the examiner controller 10 to switch the correction amount of the subject's eye E and asks the subject about the direction of the gap of the ring of the Landolt ring. For example, if the subject answers correctly, the amount of spherical correction is switched to a correction amount that is weaker by one step. That is, the amount of spherical correction is decreased by one step and switched to a value smaller than the current value. As an example, the amount of spherical correction for correcting the subject's eye E is switched from -6.50D to -6.25D by changing the spherical refractive power of the variable-focus lens 61 from +3.50D to +3.25D. For example, if the subject answers incorrectly, the amount of spherical correction is switched to a correction amount that is stronger by one step. That is, the amount of spherical correction is increased by one step and switched to a value larger than the current value. As an example, the spherical power of the variable-focus lens 61 is changed from +3.50D to +3.75D, thereby switching the amount of spherical correction from -6.50D to -6.75D.

[0095] The control unit 70 arranges the first spherical lens 51a or the second spherical lens 51b as necessary according to the amount of spherical correction to be added to the eye E. Of course, the amount of cylindrical correction and the amount of astigmatism axis correction may be switched together with the amount of spherical correction according to the answer of the examinee. In this embodiment, the variable focus lens 61 allows the spherical correction amount to be changed in one step finer than -0.25D. Similarly, the cylindrical lens 62a and the cylindrical lens 62b of the Stokes lens 62 allow the cylindrical correction amount to be changed in one step finer than -0.25D. The examiner repeats these procedures to obtain the most positive corrective refractive power value (i.e., the full correction value) that provides the best visual acuity of the eye E.

[0096] <Additional Examination> After completing the distance vision test of the subject's eye E, the examiner operates the examiner's controller 10 to start the add power test with the subject's eye E corrected to a fully corrected value at a predetermined distance (distance test distance). For example, the examiner determines the necessity of addition based on at least one of the subject's age, the accommodation power of the subject's eye E, the refractive power of the subject's eye E, and the like, and sets the initial add power. Of course, the necessity of addition and the initial add power may be automatically determined and set by the control unit 70.

[0097] In this embodiment, the complete correction value (subjective value) of the subject's eye E is calculated as -6.00D for spherical correction, -1.25D for cylindrical correction, and 135 degrees for astigmatism axis correction, and the initial add power is set to +1.00D. In the add power test using the conventional lens unit 200, the subject's eye E is corrected with the complete correction value, and a cross cylinder lens is arranged so that -0.50D is 0 degrees and +0.50D is 90 degrees, and the initial add power is increased or decreased. In this embodiment, the state in which the subject's eye E is corrected with the complete correction value and the cross cylinder lens is arranged is reproduced using the Stokes lens 62, and then the initial add power is increased or decreased.

[0098] First, the control unit 70 creates a first state assuming that the subject's eye E is corrected to a perfect correction value and a cross cylinder lens is arranged. The control unit 70 assumes that a lens with a cylindrical refractive power of -1.25D is arranged at 135 degrees as the cylindrical lens 250 of the conventional lens unit 200, and that the cross cylinder lens 270 is arranged so that +0.50D is at 90 degrees, and rotates the cylindrical lenses 62a and 62b of the Stokes lens 62 to correct the cylindrical correction amount of the subject's eye E to -1.25D and the astigmatism axis angle to 135 degrees.

[0099] 8 is a diagram showing the change in the composite refractive power of the cylindrical lens 250 and the cross cylinder lens 270. The refractive power of the cylindrical lens 250 changes according to a sine curve α that passes through -1.25D at 45 degrees, and the refractive power of the cross cylinder lens 270 changes according to a sine curve β that passes through +0.50D at 90 degrees. The sine curve γ of the composite refractive power of the cylindrical lens 250 and the cross cylinder lens 270 has its apex at a position of 116 degrees. For this reason, the control unit 70 adjusts the difference in axial angle between the cylindrical lens 62a and the cylindrical lens 62b of the Stokes lens 62 to a difference that generates a cylindrical refractive power of -1.25D, and arranges the composite axial angle of the cylindrical lens 62a and the cylindrical lens 62b to be at a position of 116 degrees instead of 135 degrees. As a result, the subject's eye E is corrected by reproducing a state in which a cylindrical correction amount (CYL) of -1.25 D, an astigmatism axis correction amount (AXIS) of 135 degrees, and a cross cylinder lens 270 (+0.50 D in the 90 degree direction) are combined.

[0100] At this time, a spherical refractive power ΔS occurs due to the deviation between the astigmatism axis correction amount of the eye E and the composite axis angle of the cylindrical lens 62a and the cylindrical lens 62b. The spherical refractive power ΔS is an amount that appears as the difference between the refractive power of the cylindrical lens 250 and the composite refractive power of the cylindrical lens 250 and the cross cylinder lens 260 (in FIG. 8, the difference between the vertical axis at the apex of the sine curve α and the sine curve γ). The spherical refractive power ΔS changes according to the deviation between the astigmatism axis correction amount and the composite axis angle, but it is smaller than one step (0.25D) and is a slight amount. For example, in this embodiment, the spherical refractive power ΔS is -0.15D.

[0101] The control unit 70 changes the spherical refractive power of the variable-focus lens 61 to +4.00D and switches and positions the first spherical lens 51a (-10.00D), thereby correcting the eye E with a spherical correction amount of -6.00D. However, since the Stokes lens 62 generates a spherical refractive power ΔS, the spherical refractive power of the variable-focus lens 61 is actually set to +3.85D, and the eye E is corrected with a spherical correction amount of -6.15D. For example, by using the variable-focus lens 61 in this manner, the numerical values ​​can be finely adjusted taking into account the spherical refractive power ΔS.

[0102] The examiner operates the examiner's controller 10 to display the cross grid optotype on the display 31. The examiner also operates the examiner's controller 10 to press a switch (not shown) to switch between a first state in which the eye E is corrected to a perfect correction value and a cross cylinder lens is placed, and a second state in which an initial add power of +1.00D is added to the first state. The control unit 70 changes the spherical refractive power of the variable-focus lens 61 in response to an operation signal from the switch (not shown). Here, the spherical refractive power of the variable-focus lens 61 is changed to +3.85D or +4.85D. As a result, the amount of spherical correction of the eye E is switched between -6.00D (actually -6.15D) without the initial add power and -5.00D (actually -5.15D) with the initial add power added.

[0103] The examiner asks the subject how the cross grid target looks, and changes the add power according to the subject's answer. The control unit 70 changes the spherical refractive power of the variable-focus lens 61 according to the spherical refractive power to be added to the subject's eye E, and positions the first spherical lens 51a or the second spherical lens 51b as necessary. The examiner repeats these procedures, and determines the stage at which the vertical and horizontal lines of the cross grid target look even as the appropriate add power for the subject's eye E.

[0104] <Near vision test> After completing the addition power test of the subject's eye E, the examiner operates the examiner's controller 10 to start a near vision test at a predetermined distance (here, the near vision test distance) of the subject's eye E. The control unit 70 switches the display 31 to a near vision position. In the conventional lens unit 200, the cross cylinder lens 270 is removed when moving from the addition power test to the near vision test. Therefore, in this embodiment, the variable focus lens 61 and the Stokes lens 62 (the cylindrical lens 62a and the cylindrical lens 62b) are adjusted to reproduce the state in which the cross cylinder lens 270 is removed. The highest visual acuity value is also obtained in the near vision test, but this procedure is omitted because it is basically the same as the far vision test.

[0105] As described above, for example, the subjective ophthalmology device of this embodiment uses a variable-focus member (here, the variable-focus lens 61) with a variable focal length to control the first correcting means for changing the spherical refractive power of the visual target light beam, and the second correcting means for changing the spherical refractive power of the visual target light beam by switching and arranging optical members (here, the first spherical lens 51a and the second spherical lens 51b), thereby changing the spherical refractive power of the visual target light beam. For example, the variable-focus member can continuously change the spherical refractive power, and therefore, the spherical correction amount of the test eye can be finely adjusted to appropriately correct the test eye. However, on the other hand, it is technically difficult for the variable-focus member to generate a spherical refractive power of a high degree, and there is a possibility that the change in the spherical refractive power of the variable-focus member alone cannot handle cases where the spherical correction amount of the test eye is large. In this embodiment, it is possible to generate a spherical refractive power of a high degree by combining the variable-focus lens with the first spherical lens or the second spherical lens as necessary. Therefore, even when the amount of spherical correction of the eye to be examined is large, the eye to be examined can be appropriately corrected and the ocular refractive power of the eye to be examined can be measured with high accuracy.

[0106] For example, in the past, when a spherical lens was switched in front of the subject's eye, the spherical power suddenly changed to another (in other words, a seam was created in the spherical power), which could cause discomfort, or the sound of the spherical lens switching could be annoying. In this embodiment, the desired spherical power is adjusted using a variable focus member, so that the spherical power changes seamlessly (without seams), allowing the measurement to proceed without discomfort. In addition, since no sound is generated when the spherical lens is switched, the annoyance can be reduced.

[0107] Also, for example, in the subjective eye examination device of this embodiment, the first correcting means can change the spherical refractive power of the visual target light beam within a first refractive power range, and when the changed spherical refractive power of the visual target light beam exceeds the first refractive power range of the spherical refractive power in the first correcting means, at least the optical member is switched and placed. For example, in a state where a variable focus member is placed in front of the eye to be examined, the spherical refractive power can be continuously changed within the first refractive power range, and the subjective examination of the eye to be examined can be smoothly performed. Also, for example, in a state where a variable focus member and an optical member are placed in front of the eye to be examined, the spherical refractive power (composite spherical refractive power) can be expanded by the optical member, and the composite spherical refractive power can be continuously changed by the variable focus member, and the subjective examination of the eye to be examined can be smoothly performed.

[0108] Also, for example, in the subjective optometry device of this embodiment, the step in which the first correcting means can change the spherical refractive power of the visual target light beam is smaller than the step in which the second correcting means can change the spherical refractive power of the visual target light beam. This allows the spherical refractive power of the visual target light beam to be changed more finely using the variable focus member. Even when the variable focus member and the optical member are combined, the spherical refractive power of the visual target light beam can be changed more finely within the range of their combined spherical refractive power.

[0109] In addition, for example, in the addition power test for measuring the addition power for the correction amount at a predetermined test distance of the eye to be examined, the subjective optometry device of the present embodiment controls the independently rotatable Stokes lenses in front of the eye to be examined, and changes the composite axial angle of the first cylindrical lens and the second cylindrical lens to a predetermined axial angle based on the cylindrical correction amount and the astigmatism axial correction amount of the eye to be examined, where the composite axial angle is an axial angle that takes into account the deviation of the astigmatism axial correction amount that occurs when an optical member and a cross cylinder lens are assumed to be arranged in order to correct the eye to be examined with the cylindrical correction amount and the astigmatism axial correction amount. For example, in the state where the Stokes lens is arranged in front of the eye to be examined, the cylindrical refractive power can be continuously changed by rotating the two cylindrical lenses separately to adjust the difference in axial angle, and the astigmatism axial angle can be continuously changed by rotating the two cylindrical lenses together to adjust the composite axial angle. At this time, in this embodiment, the deviation in the amount of astigmatism axis correction caused by the Stokes lens is taken into account, so that the amount of cylindrical correction and the amount of astigmatism axis correction of the test eye can be appropriately corrected, and the ocular refractive power of the test eye can be measured with high accuracy.

[0110] For example, in the past, when a cylindrical lens was switched in front of the eye to be examined, there was discomfort due to the change in the cylindrical refractive power with a seam, as in the case of switching the spherical lens described above, and the switching sound of the cylindrical lens was annoying. However, in this embodiment, the desired cylindrical refractive power is adjusted using a Stokes lens, so that the cylindrical refractive power changes seamlessly (without seams) and no switching sound is generated, thereby reducing discomfort and annoyance.

[0111] Furthermore, for example, the subjective eye examination device of this embodiment corrects the deviation in the spherical correction of the subject's eye, which is caused by aligning the first cylindrical lens and the second cylindrical lens to a composite axis angle, by placing a correction optical element in front of the subject's eye. As a result, even when the cylindrical refractive power and the astigmatic axis angle of the visual target light beam are changed by the Stokes lens to adjust the cylindrical correction amount and the astigmatic axis correction amount of the subject's eye, the deviation in the spherical correction of the subject's eye is appropriately corrected by the correction optical element, so that the eye refractive power of the subject's eye can be measured with high accuracy.

[0112] Also, for example, in the subjective eye examination device of this embodiment, the correction optical member for correcting the deviation of the spherical correction of the eye to be examined is a variable-focus member (here, a variable-focus lens 61) with a variable focal length, and the deviation of the spherical correction of the eye to be examined is corrected by changing the spherical refractive power of the variable-focus member. For example, the deviation of the spherical correction caused by the first cylindrical lens and the second cylindrical lens can change by a value smaller than the interval (0.25D) between the multiple spherical lenses configured in the conventional lens unit. Therefore, when a spherical optical member with a fixed focal length is used as the correction optical member, it may not be possible to fully accommodate the deviation of the spherical correction, but by using a variable-focus member with a variable focal length, it becomes possible to precisely accommodate the deviation of the spherical correction. As a result, the eye to be examined can be appropriately corrected with the desired spherical correction.

[0113] Also, for example, the subjective optometry device of this embodiment acquires the add power of the subject's eye, and switches between a first state in which the first cylindrical lens and the second cylindrical lens are aligned with a composite axis angle, and a second state in which a corrective optical element based on the add power is arranged in the first state. That is, the subject's eye is corrected with a predetermined amount of spherical correction, cylindrical correction, and astigmatism axis correction, and the deviation amount of the spherical correction is corrected, and the device switches between the first state in which no add power is added and the second state in which add power is added. This allows the optimum add power for the subject's eye to be measured with high accuracy.

[0114] In addition, for example, the subjective eye examination device of this embodiment uses both a correction optical member for correcting the deviation of the spherical correction amount of the test eye and a correction optical member for correcting the test eye with the spherical correction amount, so that the spherical correction amount for correcting the test eye can be easily adjusted in consideration of the deviation of the spherical correction amount of the test eye.

[0115] <Example of transformation> The subjective optometry device of this embodiment has been described with an example of a configuration in which the spherical refractive power is adjusted by 0.25D per step, but is not limited thereto. For example, the subjective optometry device of this embodiment can continuously change the spherical refractive power of the variable-focus lens 61. Therefore, the spherical refractive power may be adjusted in one step by a value smaller than 0.25D (for example, 0.10D, 0.05D, etc.). Similarly, the subjective optometry device of this embodiment has been described with an example of a configuration in which the cylindrical refractive power is adjusted by 0.25D per step, but is not limited thereto. For example, the subjective optometry device of this embodiment can continuously change the cylindrical refractive power of the Stokes lens 62. Therefore, the cylindrical refractive power may be adjusted in one step by a value smaller than 0.25D (for example, 0.10D, 0.05D, etc.).

[0116] The subjective optometry device of this embodiment has been described with an example of a configuration in which the amount of spherical correction of the subject's eye E, the spherical refractive power of the variable-focus lens 61, and the arrangement of the first spherical lens 51a and the second spherical lens 51b are previously associated with each other, but is not limited thereto. For example, the subjective optometry device of this embodiment may be configured to determine whether or not to arrange the first spherical lens 51a and the second spherical lens 51b based on the amount of spherical correction of the subject's eye E. In this case, the control unit 70 may determine whether or not to arrange the first spherical lens 51a and the second spherical lens 51b based on whether or not the amount of spherical correction of the subject's eye E exceeds a predetermined threshold. For example, the predetermined threshold may be a maximum value or a minimum value based on the range of spherical refractive power that can be adjusted by the variable-focus lens 61.

[0117] In this way, the subjective eye examination device of this embodiment judges whether or not to place optical elements (here, the first spherical lens 51a and the second spherical lens 51b) in front of the eye E based on the amount of spherical correction of the eye (i.e., the modified spherical refractive power obtained by modifying the spherical refractive power of the visual target light beam), and switches and places at least the optical elements based on the judgment result. This makes it possible to easily grasp, for example, a case in which the amount of spherical correction of the eye E is large and it is not possible to deal with the problem by only adjusting the spherical refractive power of the variable-focus element (here, the variable-focus lens 61), and to combine the variable-focus element and the optical element to accurately measure the ocular refractive power of the eye E.

[0118] In addition, for example, the subjective optometry device of this embodiment determines whether or not to place an optical element in front of the eye to be examined based on the amount of spherical correction (changed spherical refractive power of the visual target light beam) of the eye to be examined and the range of refractive power of the correction means. In this way, when the variable optical element alone is not sufficient, the optical element can be appropriately placed to accurately measure the ocular refractive power of the eye to be examined.

[0119] In the subjective optometry device of this embodiment, in the above-mentioned distance vision test and near vision test, the initial correction amount of the eye E or the correction amount switched to after the initial correction amount may be changed to a different correction amount. At this time, the control unit 70 may change whether to control only the variable-focus member 61 or to control both the variable-focus member 61 and the first spherical lens 51a (or the second spherical lens 51b) according to the change amount of the two correction amounts. For example, the control unit 70 may control only the variable-focus member 61 when the change amount of the two correction amounts does not exceed a predetermined change amount. Also, for example, the control unit 70 may control both the variable-focus member 61 and the first spherical lens 51a (second spherical lens 51b) when the change amount of the two correction amounts exceeds a predetermined change amount. For example, the change amount of the two correction amounts may be set in advance, and may be ±3.00D, for example.

[0120] In this way, when the subjective optometry device of this embodiment adjusts the spherical correction amount of the test eye (the modified spherical refractive power obtained by modifying the spherical refractive power of the visual target light beam) from the first modified spherical refractive power to the second modified spherical refractive power different from the first modified spherical refractive power, it controls only the first correction means and changes the focal length of the variable-focus member according to the change amount between the first modified spherical refractive power and the second modified spherical refractive power. This makes it possible to easily adjust the spherical correction amount required for the correction of the test eye, and smoothly measure the eye refractive power of the test eye.

[0121] In the subjective optometry device of this embodiment, after the correction amount for the subject's eye E is changed from the initial correction amount to a different correction amount, the subjective value (for example, a complete correction value) may be obtained by controlling only the variable-focus member 61. In this case, whether or not the first spherical lens 51a or the second spherical lens 51b is placed in the test window 43 may be set in advance according to the initial correction amount for the subject's eye E. For example, when the initial correction amount for the subject's eye E is a spherical correction amount of -1.00D, -1.00D may be generated using only the variable-focus member 61 (spherical refractive power -5.00D to +5.00D). Also, when the initial correction amount for the subject's eye E is a spherical correction amount of -4.50D, -4.5D may be generated by combining the variable-focus member 61 and the first spherical lens 51a (spherical refractive power -10.00D). For example, the amount of change until the initial correction amount of the subject's eye E is adjusted to the final correction amount (i.e., the difference between the initial correction amount and the final correction amount) can be roughly grasped from experiments, simulations, etc. Therefore, by previously arranging the first spherical lens 51a according to the initial correction amount of the subject's eye E, it is not necessary to rotate the second auxiliary lens disk 50b during measurement of the subject's eye E, and a more seamless response is possible. In addition, when such a configuration is adopted, a plurality of spherical lenses may be provided so that the spherical refractive power can be changed in a predetermined step (for example, in units of 3.00D, etc.). [Explanation of symbols]

[0122] 1 Case 2 Presentation window 10 Examiner's controller 30 Projection optical system 40 Eye Refractive Index Measuring Unit 43 Inspection window 60 Control section 100 Self-examination device

Claims

1. A subjective optometry device for subjectively measuring the ocular refractive power of a subject's eye, comprising: a correction means arranged in front of the subject's eye and configured to change an optical characteristic of the target light beam emitted from the target presenting means; an acquisition means for acquiring at least a cylindrical correction amount and an astigmatism axis correction amount for the subject's eye; A control means for controlling the correction means; Equipped with the correction means comprises a Stokes lens including a first cylindrical lens and a second cylindrical lens independently rotatable in front of the eye; the control means controls the Stokes lens in an addition power test for measuring an addition power for a correction amount at a predetermined test distance of the subject's eye, and changes a composite axial angle between the first cylindrical lens and the second cylindrical lens to a predetermined axial angle based on the cylindrical correction amount and the astigmatism axial correction amount; A subjective eye examination device characterized in that the composite axis angle is an axis angle that takes into account the amount of deviation of the astigmatism axis correction amount that occurs when assuming that an optical element and a cross cylinder lens are positioned in order to correct the test eye with the cylindrical correction amount and the astigmatism axis correction amount.

2. In the subjective optometry device of claim 1, The acquisition means acquires an amount of spherical correction of the subject's eye, the correction means has a correction optical member for correcting a deviation amount of the spherical correction of the subject's eye, the deviation amount of the spherical correction occurring when the first cylindrical lens and the second cylindrical lens are aligned with the composite axis angle, The subjective optometry device, wherein the control means corrects the deviation of the spherical correction amount by placing the correction optical element in front of the eye.

3. In the subjective optometry apparatus according to claim 2, the correction optical member is a variable-focal-length member having a variable focal length; The subjective optometry apparatus, wherein the control means corrects a deviation of the spherical correction of the subject's eye by changing a spherical refractive power of the variable-focus member.

4. In the subjective optometry device according to any one of claims 1 to 3, an additional power acquisition means for acquiring the additional power of the subject's eye, the correcting means has a corrective optical member for correcting the spherical correction amount of the subject's eye, The control means switches between a first state in which the first cylindrical lens and the second cylindrical lens are aligned to the composite axis angle, and a second state in which the corrective optical element based on the addition power is positioned in the first state.

5. A corrective means for changing optical characteristics of a visual target light beam emitted from a visual target presenting means, the corrective means having a Stokes lens including a first cylindrical lens and a second cylindrical lens that can be independently rotated in front of the eye, A subjective optometry program for use in a subjective optometry device for subjectively measuring an ocular refractive power of the subject's eye, The processor of the subjective optometry device executes the following steps: an acquisition step of acquiring at least a cylindrical correction amount and an astigmatism axis correction amount of the subject's eye; a control step of controlling the correcting means; The subjective optometry device executes the above-mentioned The control step includes controlling the Stokes lens in an addition power test for measuring an addition power for a correction amount at a predetermined test distance of the subject's eye, and changing a composite axial angle between the first cylindrical lens and the second cylindrical lens to a predetermined axial angle based on the cylindrical correction amount and the astigmatism axial correction amount; A subjective eye examination program, characterized in that the composite axis angle is an axis angle that takes into account the amount of deviation of the astigmatism axis correction that occurs when assuming that an optical element and a cross cylinder lens are positioned to correct the test eye with the cylindrical correction amount and the astigmatism axis correction amount.

Images