Major optometry device and Major optometry program

Abstract

A subjective optometry device for subjectively measuring the ocular refractive power of an eye to be examined is provided with: a correction means that is disposed in front of the eye to be examined and that changes the optical characteristics of a target light flux emitted from a target presentation means; and a control means that controls the correction means. The correction unit has a first correction unit for changing the spherical refractive power of the target light beam using a variable focus member having a variable focal length, and a second correction unit for changing the spherical refractive power of the target light beam by switching the arrangement of the optical member, and the control unit controls the first correction unit and the second correction unit. The spherical refractive power of the sighting target light beam is changed.

Description

Technical Field

[0001] The present disclosure relates to a subjective optometry device and a subjective optometry program for measuring the refractive power of an eye to be examined in a subjective manner. Background Art

[0002] There is known a subjective optometry device that measures the refractive power of the subject's eye by placing an optical component in front of the subject's eyes and presenting a test sight mark that passes through the optical component to the subject's eye. In Patent Document 1, a variable focus lens capable of changing the focal length is used as the optical component to change the spherical refractive power of the sight mark beam, thereby changing the spherical correction amount of the subject's eye.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 2017-510384 Summary of the invention

[0006] For example, the above-mentioned subjective ophthalmology device can seamlessly (without producing a seam) change the spherical correction amount of the eye to be examined from a certain correction amount to another correction amount within the range (variable domain) in which the spherical refractive power of the sight mark beam can be changed by using a variable focus lens. However, it is technically difficult to greatly change the focal length (that is, to change the spherical refractive power of the sight mark beam to a high degree) for a variable focus lens, so if the spherical correction amount of the eye to be examined exceeds the variable domain of the variable focus lens, it is sometimes difficult to respond seamlessly.

[0007] In view of the above-mentioned conventional technology, the present disclosure has as a technical object to provide a subjective optometry device and a subjective optometry program capable of measuring the refractive power of a subject's eye with high accuracy.

[0008] The subjective optometry device of the first scheme of the present disclosure is a subjective optometry device for measuring the refractive power of the eye to be examined in a subjective manner, and is characterized by comprising: a correction unit, which is arranged in front of the eye to be examined, so that the optical characteristics of the sight mark light beam emitted from the sight mark presentation unit are changed; and a control unit, which controls the correction unit, and the correction unit has a first correction unit for changing the spherical refractive power of the sight mark light beam using a variable focus component with a variable focal length and a second correction unit for changing the spherical refractive power of the sight mark light beam by switching the configuration of optical components, and the control unit controls the first correction unit and the second correction unit to execute the change of the spherical refractive power of the sight mark light beam.

[0009] The subjective optometry program of the second scheme of the present disclosure is used in a subjective optometry device, the subjective optometry device having a correction unit, the correction unit being arranged in front of the eye to be examined, so as to change the optical characteristics of the sight mark light beam emitted from the sight mark presenting unit, the correction unit having a first correction unit for changing the spherical refractive power of the sight mark light beam using a variable focus component with a variable focal length, and a second correction unit for changing the spherical refractive power of the sight mark light beam by switching the configuration of optical components, the subjective optometry device being used to measure the eye refractive power of the eye to be examined in a subjective manner, the subjective optometry program being characterized in that the subjective optometry device executes a control step of controlling the correction unit by executing the subjective optometry program by a processor of the subjective optometry device, and in the control step, the first correction unit and the second correction unit are controlled to change the spherical refractive power of the sight mark light beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1A This is an external view of a state in which the eye refractive power measurement unit is supported in a standby position.

[0011] Figure 1B This is an external view of a state in which the eye refractive power measurement unit is supported at the measurement position.

[0012] Figure 2A This is a schematic diagram showing the optical arrangement of the light projection optical system during the remote inspection.

[0013] Figure 2B This is a schematic diagram showing the optical arrangement of the light projection optical system during close-up inspection.

[0014] Figure 3 This is a schematic diagram of an eye refractive power measurement unit.

[0015] Figure 4A This is a diagram showing the internal structure of the lens unit.

[0016] Figure 4B It is a cross-sectional view of the lens unit in the horizontal direction.

[0017] Figure 5A This is a diagram showing the internal structure of a conventional lens unit.

[0018] Figure 5B It is a horizontal cross-sectional view of a conventional lens unit.

[0019] Figure 6 1 is a diagram showing changes in the combined refractive power of the cylindrical lenses and the cross cylindrical lenses included in the cylindrical lens disk.

[0020] Figure 7 This is a schematic diagram of a control system of a subjective optometry device.

[0021] Figure 8 1 is a diagram showing changes in the combined refractive power of the cylindrical lenses and the cross cylindrical lenses included in the cylindrical lens disk. DETAILED DESCRIPTION

[0022] <Summary>

[0023] The outline of the subjective optometry device of the embodiment of the present disclosure is described. In this embodiment, the left-right direction of the subjective optometry device is set as the X direction, the up-down direction is set as the Y direction, and the front-back direction (working distance direction) is set as the Z direction. L and R assigned to the figure mark represent the left eye and the right eye, respectively. It should be noted that the items classified by the following <> can be used independently or in association.

[0024] The subjective optometry device of this embodiment (for example, the subjective optometry device 100) is a device for measuring the refractive power of the eye to be examined in a subjective manner. For example, as the refractive power of the eye to be examined, at least any one of the spherical eye refractive power, the cylindrical eye refractive power, the astigmatism axis angle, etc. can be measured. Of course, the subjective optometry device can also measure binocular vision function (for example, at least any one of the prism amount, stereoscopic vision function, etc.), contrast sensitivity, etc. in addition to the refractive power of the eye.

[0025] It should be noted that, as the subjective optometry device of this embodiment, a structure having a sight mark presenting unit and a correction unit described later is cited as an example, but it is not limited to this. The subjective optometry device may also be a structure having at least a correction unit. For example, it may only have a correction unit, or it may have a sight mark presenting unit and a correction unit as a system.

[0026] The subjective optometry device of this embodiment may include an optotype presenting unit that emits an optotype light beam toward the eye to be inspected.

[0027] For example, the sight mark presenting unit may be a display (eg, display 31). Also, for example, the sight mark presenting unit may be a light source and a DMD (Digital Micromirror Device). Also, for example, the sight mark presenting unit may be a light source and a sight mark board.

[0028] For example, the sight mark light beam from the sight mark presenting unit can be directly guided toward the eye to be inspected. In addition, for example, the sight mark light beam from the sight mark presenting unit can also be guided toward the eye to be inspected via a light projection optical system (for example, the light projection optical system 30). For example, the light projection optical system can have at least one optical component through which the sight mark light beam emitted from the sight mark presenting unit passes. As an example, it can have at least any one of a lens, a reflector, etc.

[0029] The subjective optometry device of this embodiment may include a correction unit. The correction unit is disposed in front of the eye to be inspected and changes the optical characteristics of the sight mark light beam emitted from the sight mark presenting unit.

[0030] The correction unit can be any structure as long as it can change at least any one of the optical characteristics of the spherical refractive power, cylindrical refractive power and astigmatism axis angle of the sight mark beam. As an example, the correction unit can be an eye refractive power measurement unit (for example, eye refractive power measurement unit 40) that switches and configures an optical component (for example, optical element 51) in front of the eye of the subject through an inspection window (for example, inspection window 43). For example, the optical component can be at least any one of a spherical lens, a cylindrical lens, a variable focus lens, a cross cylindrical lens, a rotating prism, a wavefront modulation element, etc. Of course, the optical component can also be different from them. In addition, for example, the eye refractive power measurement unit can have a lens disk (for example, lens disk 50) on which a plurality of optical components are arranged on the same circumference. It should be noted that in this case, the optical characteristics of the sight mark beam are changed by controlling a drive unit (for example, drive unit 52, drive unit 53, etc.) for controlling the lens disk.

[0031] <Change in the spherical refractive power of the sight mark beam>

[0032] In this embodiment, the correction unit may include a first correction unit for changing the spherical refractive power of the sight mark beam using a variable optical component with a variable focal length and a second correction unit for changing the spherical refractive power of the sight mark beam by switching the configuration of the optical component.

[0033] The first correction unit is a structure that changes the focal length of the variable focus component in a state where the variable focus component is arranged in the optical path of the sight target light beam, thereby changing the spherical refractive power of the sight target light beam. For example, the first correction unit can switch the variable focus component in front of the eye of the subject. As an example, in this case, the variable focus component can be set on the lens disk of the eye refractive power measuring unit. In addition, for example, the first correction unit can also be fixedly configured with the variable focus component in front of the eye of the subject. As an example, in this case, the variable focus component can be always arranged in the inspection window of the eye refractive power measuring unit. For example, the variable focus component can be one or more. For example, the variable focus component can be a variable focus lens. As the variable focus lens, at least any one of a liquid lens, a liquid crystal lens, an Alvarez lens, etc. can be used.

[0034] The first correcting unit may be capable of changing the spherical refractive power of the sight mark beam within the range of the first refractive power using a variable focus member. That is, the first correcting unit may be capable of changing the spherical refractive power of the sight mark beam continuously using a variable focus member.

[0035] The second correction unit is a structure that changes the spherical refractive power of the sight mark light beam by switching the optical component configured in the optical path of the sight mark light beam. For example, the second correction unit can switch the optical component configured in front of the eye of the subject. As an example, in this case, the optical component can be set on the lens disk of the eye refractive power measurement unit. For example, the second optical element can be one or more. For example, the optical component can be a spherical lens. It should be noted that when a variable focus component is used as the optical component of the second correction unit, the focal length of the variable focus component can be set to a fixed distance.

[0036] The step size with which the first correction unit can change the spherical refractive power of the sight target beam can be configured to be smaller than the step size with which the second correction unit can change the spherical refractive power of the sight target beam. For example, the spherical refractive power of the sight target beam can be changed in units of less than 0.25D in the first correction unit, and in units of greater than 0.25D in the second correction unit. Of course, the value of the step size of the spherical refractive power is an example and can also be different. Thus, the spherical refractive power of the sight target beam can be continuously changed within the range of the first refractive power by using the first correction unit. In addition, the first correction unit and the second correction unit can be used in combination to expand the spherical refractive power of the sight target beam to a range of synthetic spherical refractive power wider than the first refractive power, and the spherical refractive power of the sight target beam can be continuously changed within the range of synthetic refractive power.

[0037] The subjective optometry device of this embodiment may include a determination unit (e.g., control unit 70). The determination unit determines whether to configure the optical component of the second correction unit in front of the eye to be examined based on the changed spherical refractive power of the sight mark beam after the spherical refractive power is changed. In other words, whether to configure the optical component of the second correction unit in front of the eye to be examined is determined based on the spherical correction amount for correcting the eye to be examined, which can be changed by changing the spherical refractive power of the sight mark beam. For example, the determination unit can determine whether to configure the optical component based on whether the changed spherical refractive power of the sight mark beam exceeds a predetermined threshold value set in advance. For example, the predetermined threshold value can be a fixed value or an arbitrary value that can be set by the examiner. Thus, the variable focus component of the first correction unit and the optical component of the second correction unit can be appropriately combined as needed.

[0038] The determination unit can determine whether to configure the optical component of the second correction unit in front of the eye to be examined based on the changed spherical refractive power of the sight mark beam and the range of the first refractive power of the first correction unit. In this case, the threshold value of the changed spherical refractive power of the sight mark beam can be set based on the range of the first refractive power of the first correction unit. For example, the specified threshold value can be a range from a maximum value to a minimum value of the first refractive power of the first correction unit. In addition, for example, the specified threshold value can also be a range from a value around the maximum value to a value around the minimum value of the first refractive power of the first correction unit. As an example, it can be 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 of the first refractive power. Thus, it is easy to grasp the situation that cannot be dealt with by adjusting the spherical refractive power of the sight mark beam using the first correction unit alone, such as when the spherical correction amount of the eye to be examined is a high degree, and the variable focus component of the first correction unit and the optical component of the second correction unit can be appropriately combined.

[0039] The subjective optometry device of this embodiment may include a control unit (for example, the control unit 70). The control unit controls the correction unit. For example, the control unit controls the first correction unit and the second correction unit to perform a change in the spherical refractive power of the sight mark light beam. For example, the spherical correction amount for correcting the eye to be inspected is changed by changing the spherical refractive power of the sight mark light beam. As a result, the spherical refractive power of the sight mark light beam changes seamlessly (seamlessly), and therefore, the sense of disharmony caused by the switching of the spherical refractive power of the sight mark light beam from the first changed spherical refractive power to the second changed spherical refractive power different from the first changed spherical refractive power (in other words, the spherical correction amount of the eye to be inspected is switched from the first spherical correction amount to the second spherical correction amount) can be reduced, and the refractive power of the eye to be inspected can be measured with high precision.

[0040] The control unit may dispose the variable focus component of the first correction unit in the optical path of the sight mark beam, change the focal length of the variable focus component, thereby changing the spherical refractive power of the sight mark beam and changing the spherical correction amount of the eye to be inspected. For example, the control unit may rotate the lens disk of the eye refractive power measurement unit so that the variable focus component on the lens disk is disposed in the inspection window (i.e., in the optical path of the sight mark beam). In addition, for example, the control unit may change the focal length of the variable focus component at the inspection window of the eye refractive power measurement unit.

[0041] The control unit may place a predetermined optical component of the second correction unit in the optical path of the sight mark beam, thereby changing the spherical refractive power of the sight mark beam and changing the spherical correction amount of the eye to be inspected. For example, the control unit may rotate the lens disk of the eye refractive power measurement unit to place the optical component on the lens disk in the inspection window (i.e., in the optical path of the sight mark beam).

[0042] For example, when the spherical refractive power of the sight target beam is changed by using the variable focus component of the first correction unit, the variable focus component can be changed to a predetermined focal length in a state where the variable focus component of the first correction unit is arranged in the optical path of the sight target beam and the optical component of the second correction unit is deviated from the optical path of the sight target beam. In addition, for example, when the spherical refractive power of the sight target beam is changed by using the optical component of the second correction unit, the variable focus component of the first correction unit is deviated from the optical path of the sight target beam and the optical component of the second correction unit is arranged in the optical path of the sight target beam. Alternatively, the variable focus component can be changed to a focal length of 0D in a state where both the variable focus component of the first correction unit and the optical component of the second correction unit are arranged in the optical path of the sight target beam.

[0043] Of course, for example, when the spherical refractive power of the sight mark beam is changed by using a combination of the variable focus component of the first correction unit and the optical component of the second correction unit, the variable focus component can also be changed to a predetermined focal length in a state where both the variable focus component and the optical component are arranged in the optical path of the sight mark beam. It should be noted that by combining the variable focus component and the optical component, the spherical refractive power of the sight mark beam can be greatly changed. Therefore, even when the spherical correction amount of the eye to be examined is large, the refractive power of the eye to be examined can be measured with high precision.

[0044] The control unit may configure at least the optical components of the second correction unit based on the changed spherical refractive power of the sight mark beam. That is, the control unit may configure only the optical components of the second correction unit based on the changed spherical refractive power of the sight mark beam, or may adjust the variable focus components of the first correction unit and configure the optical components of the second correction unit.

[0045] For example, the control unit may control at least the second correction unit to switch the configuration of the optical component when the changed spherical refractive power of the sight mark beam exceeds the range of the first refractive power of the first correction unit. In other words, the optical component may be configured in at least any one of the cases where the changed spherical refractive power of the sight mark beam exceeds the maximum value of the first refractive power of the first correction unit and exceeds the minimum value of the first refractive power. In addition, for example, the control unit may also configure at least the optical component in at least any one of the cases where the changed spherical refractive power of the sight mark beam is within the range of the first refractive power of the spherical refractive power of the first correction unit and exceeds the value around the maximum value of the first refractive power and exceeds the value around the minimum value of the first refractive power.

[0046] The control unit can adjust the variable focus component of the first correction unit by using a table or an operation formula that establishes a correspondence between the changed spherical refractive power of the sight mark beam and the first refractive power of the first correction unit. In addition, the control unit can set whether to configure the optical component of the second correction unit by using a table or an operation formula that establishes a correspondence between the changed spherical refractive power of the sight mark beam and the second refractive power of the second correction unit. Of course, the control unit can perform the adjustment of the variable focus component of the first correction unit and the setting of whether to configure the optical component of the second correction unit by using the changed spherical refractive power of the sight mark beam, the first refractive power of the first correction unit and the second refractive power of the second correction unit. For example, such a table can be obtained in advance through experiments and simulations and stored in a storage unit.

[0047] The control unit can control at least the second correction unit and switch the configuration of the optical components based on the determination result of the aforementioned determination unit. For example, the control unit can control the first correction unit to use the variable focus component to generate the specified spherical refractive power when it is determined that the amount of change in the spherical refractive power of the sight mark light beam does not exceed the specified threshold value. In addition, for example, the control unit can control at least the second correction unit to use at least the optical component to generate the specified spherical refractive power when it is determined that the amount of change in the spherical refractive power of the sight mark light beam exceeds the specified threshold value. It should be noted that the first correction unit and the second correction unit can also be controlled simultaneously according to the amount of change in the spherical refractive power of the sight mark light beam, and the variable focus component and the optical component can be used to generate the specified spherical refractive power. In this way, the refractive power of the eye to be examined can be measured with high precision.

[0048] The control unit can control only the first correction unit to change the focal length of the variable focus component according to the amount of change between the first changed spherical refractive power and the second changed spherical refractive power when adjusting the changed spherical refractive power of the sight mark beam from the first changed spherical refractive power to the second changed spherical refractive power that is different from the first changed spherical refractive power. For example, when the amount of change between the first changed spherical refractive power before the spherical refractive power of the sight mark beam is changed and the second changed spherical refractive power after the change is below a prescribed threshold, only the first correction unit can be controlled. In addition, for example, when the amount of change between the first changed spherical refractive power and the second changed spherical refractive power exceeds a prescribed threshold, the first correction unit and the second correction unit can be controlled, or only the second correction unit can be controlled. For example, the prescribed threshold value can be a fixed value or an arbitrary value that can be set by the examiner. Thereby, the spherical correction degree required for the correction of the eye to be examined can be easily adjusted, and the eye refractive power of the eye to be examined can be smoothly measured.

[0049] <Changes in the cylindrical refractive power of the sight mark beam and the angle of the astigmatism axis>

[0050] In the present embodiment, the correction unit may have a Stokes lens including a first cylindrical lens and a second cylindrical lens that can be independently rotated in front of the eye to be examined. For example, the correction unit may be able to continuously change the cylindrical refractive power of the sight mark light beam by rotating the first cylindrical lens and the second cylindrical lens respectively to change the relative angle of the astigmatism axis of each cylindrical lens. In addition, for example, the correction unit may be able to continuously change the astigmatism axis angle of the sight mark light beam by rotating the first cylindrical lens and the second cylindrical lens as a whole to change the angle of the synthetic axis of each cylindrical lens. For example, the first cylindrical lens and the second cylindrical lens may be composed of two positive cylindrical lenses with equal focal lengths, or may be composed of a positive cylindrical lens and a negative cylindrical lens with equal focal lengths.

[0051] The correction unit may have a correction optical component for correcting the offset of the spherical correction amount of the eye to be inspected caused by aligning the first cylindrical lens and the second cylindrical lens at the synthetic axis angle. For example, the correction optical component may be a component that can change the spherical refractive power of the sight mark beam. As an example, at least any one of a variable focus component with a variable focal length, an optical component with a constant focal length, etc. may be used. In addition, for example, the correction optical component may be one or more.

[0052] For example, the correction unit can switch the configuration of the correction optical component in front of the eye of the subject. As an example, in this case, the correction optical component can be set on the lens disk of the eye refractive power measurement unit. Such a correction optical component can be at least any one of a variable focus component (for example, a variable focus lens), an optical component (for example, a spherical lens), etc. In addition, for example, the correction unit can also fix the configuration of the correction optical component in front of the eye of the subject. As an example, in this case, the correction optical component can be always configured in the inspection window of the eye refractive power measurement unit. Such a correction optical component can be a variable focus component (for example, a variable focus lens).

[0053] The correction unit may have a correction optical component for correcting the spherical correction amount of the eye to be inspected. For example, the correction optical component may be a component that can change the spherical refractive power of the sight mark beam. As an example, at least one of a variable focus component with a variable focal length, an optical component with a constant focal length, etc. may be used. In addition, for example, the correction optical component may be one or more.

[0054] For example, the correction unit can switch the configuration of the corrective optical component in front of the eye to be inspected. As an example, in this case, the corrective optical component can be set on the lens disk of the eye refractive power measurement unit. Such a corrective optical component can be at least any one of a variable focus component (for example, a variable focus lens), an optical component (for example, a spherical lens), etc. In addition, for example, the correction unit can also fixedly configure the corrective optical component in front of the eye to be inspected. As an example, in this case, the corrective optical component can be always configured in the inspection window of the eye refractive power measurement unit. Such a corrective optical component can be a variable focus component (for example, a variable focus lens).

[0055] It should be noted that in this embodiment, a corrective optical component for correcting the offset of the spherical correction amount caused by aligning the first cylindrical lens and the second cylindrical lens of the Stokes lens at the synthetic axis angle and a corrective optical component for adjusting the spherical correction amount for correcting the eye to be examined can be used together.

[0056] In addition, in the present embodiment, the correction optical component for correcting the offset of the spherical correction amount of the eye to be inspected can be used together with the variable focus component with a variable focal length of the first correction unit, and the correction optical component for correcting the offset of the spherical correction amount of the eye to be inspected can be used together with the optical component of the second correction unit. Similarly, in the present embodiment, the correction optical component for adjusting the spherical correction amount of the eye to be inspected can be used together with the variable focus component with a variable focal length of the first correction unit, and the correction optical component for adjusting the spherical correction amount of the eye to be inspected can be used together with the optical component of the second correction unit. Thus, the spherical correction amount of the eye to be inspected can be easily adjusted.

[0057] The subjective optometry device of this embodiment may include an acquisition unit (e.g., the control unit 70). The acquisition unit acquires at least the cylindrical correction amount and the astigmatism axis correction amount for the eye to be examined. For example, the acquisition unit may acquire the cylindrical correction amount and the astigmatism axis correction amount based on the refractive power (subjective value) obtained by measuring the eye to be examined in an external sense. In addition, for example, the acquisition unit may acquire the cylindrical correction amount and the astigmatism axis correction amount based on the refractive power (subjective value) obtained by measuring the eye to be examined in an external sense. As an example, the subjective value of the eye to be examined may be the closest corrective refractive power (complete correction value) that can obtain the highest visual acuity of the eye to be examined, the corrective refractive power (prescription value) that can obtain the prescribed visual acuity of the eye to be examined, and the like. Of course, the acquisition unit may also acquire the spherical correction amount of the eye to be examined together with the cylindrical refractive power and the astigmatism axis angle of the eye to be examined.

[0058] For example, the acquisition unit can acquire the cylindrical correction amount and the astigmatism axis correction amount input by the examiner's operation of the operating unit (for example, the examiner's controller 10). In addition, for example, the acquisition unit can also read the identifier of each subject and acquire the cylindrical correction amount and the astigmatism axis correction amount stored in the identifier. As an example, for the identifier, an ID, a character string, a one-dimensional code, a two-dimensional code, a color code, etc. can be used. In addition, for example, the acquisition unit can also acquire the cylindrical correction amount and the astigmatism axis correction amount by receiving data measured by a device different from the subjective optometry device of the present embodiment.

[0059] The subjective optometry device of this embodiment may include an addition degree acquisition unit (e.g., the control unit 70). The addition degree acquisition unit acquires the addition degree of the correction amount at a predetermined inspection distance relative to the eye to be inspected. For example, the addition degree may be a degree based on at least any one of the refractive power, accommodative power, age, etc. of the eye to be inspected.

[0060] For example, the addition degree acquisition unit may acquire the addition degree input by the examiner operating the operation unit. Also, for example, the addition degree acquisition unit may read the identifier of each subject and acquire the addition degree stored in the identifier. Also, for example, the addition degree acquisition unit may acquire the addition degree by receiving data measured by a device different from the subjective optometry device of the present embodiment.

[0061] The subjective optometry device of this embodiment may include a control unit. It should be noted that the control unit may be the same as the control unit described in the above-mentioned <Change of the spherical refractive power of the sight mark beam>. Of course, a different control unit may also be provided.

[0062] The control unit can control the correction unit in an addition test for measuring the addition of the correction amount at a specified inspection distance relative to the eye to be inspected. That is, the control unit can control the Stokes lens in the addition test. For example, the control unit can change the composite axis angle of the first cylindrical lens and the second cylindrical lens to a specified axis angle based on the cylindrical correction amount and the astigmatism axis correction amount obtained by the aforementioned acquisition unit. For example, such a composite axis angle can be an axis angle that takes into account the offset of the astigmatism axis angle generated when the optical components and cross cylindrical lenses are configured in order to correct the eye to be inspected with the cylindrical correction amount and the astigmatism axis correction amount. It should be noted that the optical component here can be an optical component (as an 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 inspected by changing at least one of the cylindrical refractive power of the sight mark beam and the astigmatism axis angle. Thus, the cylindrical refractive power and the astigmatism axis angle of the sight mark light beam change seamlessly (seamlessly), so the sense of discomfort caused by the switching of the cylindrical refractive power of the sight mark light beam 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 switching of the cylindrical correction amount of the eye to be examined from the first cylindrical correction amount to the second cylindrical correction amount) can be reduced, and the refractive power of the eye to be examined can be measured with high precision. Similarly, the sense of discomfort caused by the switching of the astigmatism axis angle of the sight mark light beam from the first changed astigmatism axis angle to the second changed astigmatism axis angle different from the first changed astigmatism axis angle (in other words, the switching of the astigmatism axis correction amount of the eye to be examined from the first astigmatism axis correction amount to the second astigmatism axis correction amount) can be reduced, and the refractive power of the eye to be examined can be measured with high precision.

[0063] The control unit can correct the offset of the spherical correction amount of the eye to be inspected by configuring a correcting optical component in front of the eye to be inspected. In other words, the correcting optical component can be configured in the optical path of the sight mark beam to change the spherical refractive power of the sight mark beam, thereby correcting the offset of the spherical correction amount of the eye to be inspected. For example, the control unit can rotate the lens disk of the eye refractive power measuring unit, configure the variable focus component on the lens disk as the correcting optical component on the inspection window, and change the focal length of the variable focus component. In addition, for example, the control unit can rotate the lens disk of the eye refractive power measuring unit, configure the optical component on the lens disk as the correcting optical component on the inspection window. Thereby, the spherical correction amount of the eye to be inspected is appropriately corrected by the correcting optical component.

[0064] The control unit can use a variable focus component with a variable focal length as a correction optical component to change the spherical refractive power of the variable focus component, thereby correcting the offset of the spherical correction amount of the eye to be inspected. For example, the offset of the spherical correction amount caused by the adjustment of the Stokes lens is small, so by using the variable focus component to finely adjust it, the accuracy of the correction is further improved.

[0065] The control unit can set the synthetic axis angle by using a table or a calculation formula that establishes a correspondence between the cylindrical correction amount and the astigmatism axis correction amount of the eye to be examined and the synthetic axis angle of the first cylindrical lens and the second cylindrical lens. In addition, the control unit can configure the corrective optical component by using a table or a calculation formula that establishes a correspondence between the cylindrical correction amount and the astigmatism axis correction amount of the eye to be examined and the offset of the astigmatism axis angle correction amount associated with the setting of the synthetic axis angle of the first cylindrical lens and the second cylindrical lens. Of course, the control unit can set the synthetic axis angle and configure the corrective optical component by using a table or a calculation formula that establishes a correspondence between the cylindrical correction amount and the astigmatism axis correction amount of the eye to be examined, the synthetic axis angle of the first cylindrical lens and the second cylindrical lens, and the offset of the astigmatism axis correction amount associated with the setting of the synthetic axis angle. For example, such a table can be obtained in advance through experiments or simulations and stored in a storage unit.

[0066] The control unit can switch between a first state in which the first cylindrical lens and the second cylindrical lens are aligned at a composite axis angle and a second state in which a correction optical component based on the addition degree is further configured in the first state. For example, the control unit can switch the configuration of the correction optical component in the optical path of the sight mark beam to change the spherical refractive power of the sight mark beam, thereby switching from the first state to the second state. For example, the control unit can rotate the lens disk of the eye refractive power measurement unit, so that the variable focus component on the lens disk is configured as a correction optical component on the inspection window, and the focal length of the variable focus component is changed. In addition, for example, the control unit can rotate the lens disk of the eye refractive power measurement unit so that the optical component on the lens disk is configured as a correction optical component on the inspection window. As a result, the spherical correction amount of the eye to be inspected is appropriately corrected by the correction optical component. Since the state in which no addition degree is given to the eye to be inspected and the state in which the addition degree is given to the eye to be inspected are switched in the state in which the offset amount of the spherical correction amount of the eye to be inspected is corrected, the most suitable addition degree for the eye to be inspected can be measured with high accuracy.

[0067] It should be noted that the present disclosure is not limited to the devices described in this embodiment. For example, terminal control software (program) that performs the functions of the above-mentioned embodiment can also be supplied to the device or system via a network or various storage media, and the control device (e.g., CPU, etc.) of the device or system reads and executes the program.

[0068] <Example>

[0069] An example of a subjective optometry device in this embodiment will be described. Figure 1A and Figure 1B 2 is an external view of the subjective optometry device 100 . Figure 1A This is a state where the eye refractive power measurement unit 40 is supported at the standby position. Figure 1BThis is a state where the eye refractive power measurement unit 40 is supported at the 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 refractive power measurement unit 40, and the like.

[0070] The housing 1 has a light projection optical system 30 inside. The presentation window 2 transmits the sight mark beam generated by the light projection optical system 30. The sight mark beam is projected onto the subject's eye E through the presentation window 2. It should be noted that when an eye refractive power measuring unit 40 is arranged between the subject's eye E and the presentation window 2 (see Figure 1B ), a sight mark beam is projected to the eye E to be inspected via the presentation window 2 and the inspection window 43 described later. Thus, the inspection sight mark is presented to the eye E to be inspected.

[0071] The holding unit 4 holds the eye refractive power measurement unit 40. For example, the holding unit 4 moves the arm by driving a driving unit (motor, etc.) (not shown) to move the eye refractive power measurement unit 40 connected to the arm. Thus, the standby position and the measurement position of the eye refractive power measurement unit 40 are switched.

[0072] The examiner controller 10 is used for the examiner to operate the subjective optometry device 100. The examiner controller 10 includes a switch unit 11, a monitor 12, etc. The switch unit 11 inputs signals for making various settings (for example, the selection of visual targets presented to the examinee, etc.). The monitor 12 displays various information (for example, the measurement results of the examinee's eye E, etc.). It should be noted that the monitor 12 can also function as a touch panel that also serves as the switch unit 11. The signal from the examiner controller 10 is output to the control unit 60 via wired communication or wireless communication.

[0073] <Light projection optical system>

[0074] Figure 2A and Figure 2B It is a schematic diagram of the light projection optical system 30 . Figure 2A Shows the optical configuration for distance vision testing. Figure 2B The optical arrangement for near vision inspection is shown. The light projection optical system 30 projects a sight target beam toward the subject's eye E. For example, the light projection optical system 30 includes a display 31, a plane reflection mirror 32, a concave reflection mirror 33, a near-far switching unit 34, and the like.

[0075] The display 31 displays an optotype (e.g., a fixation optotype, a test optotype, etc.). The optotype light beam emitted from the display 31 is imaged on the fundus of the eye E to be inspected, so that the optotype appears in the eye E to be inspected. For example, the display 31 may be an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), a plasma display, etc.

[0076] The plane mirror 32 reflects the sight mark beam from the display 31 and guides it to the concave mirror 33. In addition, the plane mirror 32 reflects the sight mark beam from the display 31 and guides it to the eye to be inspected E. For example, in the near vision test of the eye to be inspected E, the plane mirror 32 is arranged so that the distance (presentation distance) from the eye to be inspected E to the display 31 is optically 40 cm. It should be noted that a reflective member such as a prism, a beam splitter, or a half mirror can be used instead of the plane mirror 32.

[0077] The concave reflector 33 reflects the sight mark beam from the display 31 and guides it to the plane reflector 32. For example, in the far vision test of the eye E to be examined, the concave reflector 33 is configured so that the distance (presentation distance) from the eye E to the display 31 is optically 5 m. It should be noted that a reflective member such as an aspherical reflector or a free-form surface reflector can be used instead of the concave reflector 33. In addition, a lens or the like can be used instead of the concave reflector 33.

[0078] The near-far switching unit 34 switches the configuration of the display 31 during the distance vision test and the near vision test of the subject's eye E. For example, the near-far switching unit 34 drives the holding unit (a motor or the like) not shown to move the display 31 held by the holding unit. Thus, the distance vision configuration and the near vision configuration of the display 31 are switched.

[0079] For example, during the distance vision test of the subject's eye E, the display screen of the display 31 faces the back side of the housing 1 (see FIG. Figure 2A ). The sight mark beam from the display 31 passes through the optical axis L1 and is incident on the plane reflector 32, and is reflected by the plane reflector 32 in the direction of the optical axis L2. In addition, it passes through the optical axis L2 and is incident on the concave reflector 33, and is reflected by the concave reflector 33 in the direction of the optical axis L3. In addition, it passes through the optical axis L3 and is incident on the plane reflector 32, and is reflected by the plane reflector 32 in the direction of the optical axis L4. Thus, the sight mark beam is projected onto the subject's eye E, passes through the various optical components inside the housing 1, and is emitted to the outside of the housing 1.

[0080] For example, during the 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. Figure 2B The sight mark beam from the display 31 passes through the optical axis L3 and enters the plane reflector 32, and is reflected in the direction of the optical axis L4 by the plane reflector 32. Thus, the sight mark beam is projected onto the subject's eye E inside the housing 1 through each optical component and emitted to the outside of the housing 1.

[0081] <Eye refractive power measurement unit (corrective optical system)>

[0082] Figure 31 is a schematic diagram of an eye refractive power measuring unit 40. The eye refractive power measuring unit 40 measures the refractive power of the subject's eye E in a subjective manner. In addition, the eye refractive power measuring unit 40 is used as a corrective optical system. The corrective optical system is arranged in the optical path of the projection optical system 30, and changes the optical characteristics of the sight mark beam. For example, the eye refractive power measuring unit 40 includes a forehead rest 41, a lens unit 42, an inspection window 43, a moving unit 44, and the like.

[0083] The forehead rest 41 is fixed to the subject's forehead to fix the subject's eye E at a predetermined inspection position, and the distance from the subject's eye E to the inspection window 43 is kept constant. The lens unit 42 has a left lens unit 42L and a right lens unit 42R, which are a pair of left and right lenses. The lens unit 42 has inspection windows 43 (a left inspection window 43L and a right inspection window 43R).

[0084] The moving unit 44 adjusts the interval between the left lens unit 42L and the right lens unit 42R and the convergence angle (convergence angle) of the left lens unit 42L and the right lens unit 42R. For example, the moving unit 44 adjusts the interval between the left lens unit 42L and the right lens unit 42R by driving the driving unit 45 (the left driving unit 45L and the right driving unit 45R). In addition, for example, the moving unit 44 adjusts the convergence angle of the left lens unit 42L and the right lens unit 42R by driving the driving unit 46. It should be noted that, for the detailed structure of the moving unit 44, please refer to Japanese Patent Publication No. 2004-329345, for example.

[0085] Figure 4A and Figure 4B It is a schematic diagram of the lens unit 42 . Figure 4A 4 is a diagram showing the internal structure of the lens unit 42 . Figure 4B is a horizontal cross-sectional view of the lens unit 42. It should be noted that: Figure 4A and Figure 4B Only the left lens unit 42L is shown, and the right lens unit 42R is omitted. For example, the lens unit 42 includes a variable focus lens 61 , a Stokes lens 62 , and a lens disk 50 .

[0086] The variable focus lens 61 is fixedly arranged in the lens unit 42. The variable focus lens 61 can adjust the spherical refractive power according to the magnitude of the applied voltage, change the focal position, and thus generate a spherical refractive power that continuously changes within a specified range. For example, in this embodiment, a spherical refractive power of -5.00D to +5.00D can be generated.

[0087] The Stokes lens 62 is rotatably arranged in 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 equal focal lengths. It should be noted that the cylindrical lenses 62a and 62b can also be two positive cylindrical lenses with equal focal lengths.

[0088] The cylindrical lens 62a and the cylindrical lens 62b are driven by the rotating mechanisms 63a and 63b respectively to rotate independently around the optical axis L4. By changing the rotation angle of at least one of the cylindrical lens 62a and the cylindrical lens 62b and setting a difference in the axis angle of each cylindrical lens, a cylindrical refractive power that changes continuously within a specified range can be generated. For example, in the present embodiment, a cylindrical refractive power of -10.00D to +10.00D can be generated. In addition, by integrally changing the rotation angle of both the cylindrical lens 62a and the cylindrical lens 62b while maintaining the difference in the axis angle between them (i.e., changing the composite axis angle of the cylindrical lens 62a and the cylindrical lens 62b), the astigmatism axis angle that changes continuously within a specified range can be adjusted. For example, in the present embodiment, the astigmatism axis angle of 1 degree to 180 degrees can be adjusted.

[0089] The lens disk 50 has an opening (or a lens of 0D) and a plurality of optical elements 51 on the same circumference. The lens disk 50 is rotated with the disk center as a reference by the drive of the drive unit 52. In addition, each optical element 51 is rotated with the optical axis L4 as the center by the drive of the drive unit 53. Thus, the desired optical element 51 is switched and arranged on the inspection window 43 at a desired angle.

[0090] The lens disk 50 is composed of one lens disk or a plurality of lens disks. For example, in the present embodiment, a first auxiliary lens disk 50a and a second auxiliary lens disk 50b are provided. A polarizing filter, a red filter / green filter, a dispersion prism, a Maddox rod lens, etc. are provided in the first auxiliary lens disk 50a as an optical element 51. A transparent lens, a rotating prism, an automatic cross cylindrical lens, a first spherical lens 51a, a second spherical lens 51b, etc. are provided in the second auxiliary lens disk 50b as an optical element 51. For example, a mark for aligning the pupil distance of the eye E to be examined is marked on the transparent lens. For example, the first spherical lens 51a is a lens having a spherical power of -10.00D in terms of the position of wearing glasses. For example, the second spherical lens 51b is a lens having a spherical power of +10.00D in terms of the position of wearing glasses. For example, the spherical refractive power of the first spherical lens 51 a and the second spherical lens 51 b is a refractive power greater than a predetermined range of the spherical refractive power of the zoom lens 61 .

[0091] It should be noted that the glasses wearing position in this embodiment is the position where the glasses lens is arranged in front of the subject's eye E when the subject wears glasses, and is the position of the optical element (i.e., the variable focus lens 61) closest to the subject's eye E. More specifically, it is the position G of the rear surface of the variable focus lens 61. In addition, the distance from the corneal vertex position of the subject's eye E to the position of the variable focus lens 61 (the position G of the rear surface of the variable focus lens 61) can be regarded as the inter-corneal vertex distance VD.

[0092] <Adjustment range of spherical refractive power>

[0093] In this embodiment, when the variable focus lens 61 is combined with any one of the first spherical lens 51a and the second spherical lens 51b, the range of the spherical refractive power that can be adjusted using only the variable focus lens 61 can be expanded. For example, by setting the variable focus lens 61 to any value from 0D to -5.00D and combining it with the first spherical lens 51a (-10.00D), a spherical refractive power of -10.00D to -15.00D can be generated. For example, by setting the variable focus lens 61 to any value from 0D to +5.00D and combining it with the second spherical lens 51b (+10.00D), a spherical refractive power of +10.00D to +15.00D can be generated.

[0094] That is, in this embodiment, a spherical refractive power of -5.00D to +5.00D can be seamlessly generated using only the variable focus lens. In addition, by arranging the first spherical lens 51a or the second spherical lens 51b on the inspection window 43 in addition to the variable focus lens 61, a spherical refractive power of -10.00D to -15.00D and a spherical refractive power of +10.00D to +15.00D can be seamlessly generated. Therefore, as a whole, a spherical refractive power of -15.00D to +15.00D can be seamlessly generated.

[0095] For example, the spherical correction amount of the subject's eye E, the spherical refractive power of the zoom lens 61, and the spherical refractive power of the first spherical lens 51a and the second spherical lens 51b may also be pre-established in correspondence. For example, the correspondence may be pre-established in such a way that when the spherical correction amount of the subject's eye E exceeds the spherical refractive power that can be adjusted by the zoom lens 61, the first spherical lens 51a and the second spherical lens 51b are used to generate the spherical refractive power (in other words, the first spherical lens 51a or the second spherical lens 51b) . As an example, a reference table for referring to the value of the spherical refractive power of the zoom 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 subject's eye E may be prepared in advance and stored in the memory 75.

[0096] <Reproduction of the configuration of the crossed cylindrical lenses>

[0097] Here, a lens unit included in a conventional eye refractive power measurement unit will be briefly described. Figure 5A and Figure 5B It is a schematic diagram of a conventional lens unit 200 . Figure 5A It is a diagram showing the internal structure of a conventional lens unit 200 . Figure 5B is a horizontal cross-sectional view of a conventional lens unit 200. It should be noted that Figure 5A and Figure 5B Only the left lens unit is shown in the figure, and the right lens unit is omitted.

[0098] 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 arranged in a direction away from the subject's eye E. In the strong spherical lens disk 210a, spherical lenses of -18.00D to +15.00D are arranged at intervals of 3.00D. In the weak spherical lens disk 210b, spherical lenses of -1.00D to +1.75D are arranged at intervals of 0.25D. In the strong cylindrical lens disk 210c, cylindrical lenses of -1.50D to -7.50D are arranged at intervals of 1.50D in terms of the position of wearing glasses. In the weak cylindrical lens disk 210d, cylindrical lenses of -0.25D to -1.25D are arranged at intervals of 0.25D in terms of the position of wearing glasses. Polarizing filters, red filters / green filters, dispersion prisms, Maddox rod lenses, etc. are arranged in the first auxiliary lens disk 210e. Transparent lenses, rotating prisms, automatic cross cylindrical lenses, cross cylindrical lenses, etc. are arranged in the second auxiliary lens disk 210f. It should be noted that for details of the lens unit 200, please refer to, for example, Japanese Patent Publication No. 2007-125125.

[0099] In the conventional lens unit 200, a strong cylindrical lens disk 210c, a weak cylindrical lens disk 210d, and a cross cylindrical lens are provided. For example, a cross cylindrical lens is a lens formed by combining cylindrical lenses of different cylindrical refractive power signs and equal size in such a way that the angles of their astigmatism axes are orthogonal. As an example, a lens formed by combining cylindrical lenses of -0.25D and +0.25D in such a way that the angles of their astigmatism axes 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 cylindrical lens.

[0100] Figure 61 is a diagram showing changes in the combined refractive power of the cylindrical lens and the cross cylindrical 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 arranged 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 the angle of its astigmatism axis becomes 135 degrees. At this time, the refractive power of the cylindrical lens 250 changes in a sinusoidal curve α that passes through -0.50D at 0 degrees, 90 degrees, and 180 degrees, passes through -1.00D at 45 degrees, and passes through 0.00D at 135 degrees.

[0101] In addition, for example, the cross cylindrical lens 260 of the first auxiliary lens disk 210e is switched and arranged in front of the eye E. As an example, the cross cylindrical lens 260 is rotated so that +0.25D becomes 90 degrees. At this time, the refractive power of the cross cylindrical lens 260 changes in a sinusoidal curve β that passes through -0.25D at 0 degrees and 180 degrees, passes through 0.00D at 45 degrees and 135 degrees, and passes through +0.25D at 90 degrees.

[0102] For example, when the cylindrical lens 250 and the cross cylindrical lens 260 are switched and arranged in front of the eye of the subject E, a composite refractive power is generated by synthesizing the respective refractive powers. At this time, the composite refractive power changes in the order of 0 degrees, 45 degrees, 90 degrees, 135 degrees, and 180 degrees through a sine curve γ of -0.75D, -1.00D, -0.25D, 0.00D, and -0.75D. It should be noted that, for example, the apex of the sine curve α of the refractive power of the cylindrical lens 250 is located at 135 degrees, and in contrast, the apex of the sine curve γ of the composite refractive power of the cylindrical lens 250 and the cross cylindrical lens 260 is offset to a position of 122 degrees.

[0103] In the present embodiment, by setting the composite axis angle of the cylindrical lens 62a and the cylindrical lens 62b in the Stokes lens 62 in consideration of the offset of the astigmatism axis angle generated when the cylindrical lens 250 and the cross cylindrical lens 260 are configured, it is possible to create a state in which the cylindrical lens 250 and the cross cylindrical lens 260 are configured using only the Stokes lens 62. For example, by adjusting the difference in the axis angles between the cylindrical lens 62a and the cylindrical lens 62b to produce a difference in cylindrical refractive power of -1.00D and aligning the composite axis angle of the cylindrical lens 62a and the cylindrical lens 62b at a position of 122 degrees instead of 135 degrees, it is possible to reproduce the configuration of the cylindrical lens 250 and the cross cylindrical lens 260 described above.

[0104] For example, the cylindrical correction amount and astigmatism axis angle of the subject's eye E and the composite axis angle of the cylindrical lens 62a and the cylindrical lens 62b may be previously associated. As an example, a reference table for referring to the values ​​of the astigmatism axis angles of the cylindrical lens 62a and the cylindrical lens 62b based on the cylindrical correction amount and astigmatism axis correction amount of the subject's eye E may be prepared in advance and stored in the memory 75.

[0105] It should be noted that in the conventional lens unit 200, in a state where a spherical lens, a cylindrical lens 250, and a cross cylindrical lens 260 are arranged in front of the eye E to be inspected, the equivalent spherical value of the eye E to be inspected is taken into consideration. For example, if the cylindrical lens 250 is switched to change the cylindrical refractive power by 0.25D (one step), a spherical refractive power of 0.125D is generated. For example, in a case where the spherical lenses are arranged at intervals of 0.25D, when the cylindrical refractive power is changed by 0.50D (two steps), the spherical lens can be switched to change the spherical refractive power by 0.25D, and correction can be performed taking into consideration the equivalent spherical value. In the present embodiment, by using the variable focus lens 61, correction taking into consideration the change in the spherical refractive power accompanying the change in the cylindrical refractive power can be easily performed. In addition, if the cylindrical refractive power is slightly changed by using the Stokes lens 62, the spherical refractive power changes in various ways, but correction can also be easily performed in such a case.

[0106] <Control Unit>

[0107] Figure 7 This is a schematic diagram of the 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. The RAM temporarily stores various information. The ROM stores various programs executed by the CPU, etc. It should be noted that the control unit 70 can also be composed of multiple control units (that is, multiple processors).

[0108] The control unit 70 is connected to the display 31, the examiner controller 10, the nonvolatile memory 75 (hereinafter referred to as the memory 75), etc. In addition, the control unit 70 is connected to the drive unit of the holding unit 4, the drive unit of the near-far switching unit 34, the drive unit of the eye refractive power measurement unit 40 (drive units 45, 46, 52, 53), etc.

[0109] The memory 75 is a non-transitory storage medium that can retain stored content even when power is cut off. For example, the memory 75 may be a hard disk drive, a flash ROM, a USB memory, or the like.

[0110] <Control Action>

[0111] The control operation of the subjective optometry device 100 will be described.

[0112] The examiner adjusts the position of the forehead rest 170 by operating the forehead rest adjustment knob (not shown) so that the distance VD between the corneal vertices of the subject's eye E becomes a predetermined distance (e.g., 12 mm). In addition, the examiner inputs the pupil distance of the subject's eye by operating the examiner controller 10. The control unit 70 adjusts the interval of the lens unit 42 to align the inspection window 43 with the pupil distance.

[0113] <Setting of initial correction amount>

[0114] The examiner operates the examiner controller 10 and inputs the external eye refractive power (external value) obtained in advance by external eye 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. The control unit 70 applies voltage to the variable focus lens 61 based on the aforementioned reference table and rotates the Stokes lens 62 and the lens disk 50. It should be noted that the control of the variable focus lens 61, the Stokes lens 62, and the lens disk 50 can be performed sequentially or substantially simultaneously.

[0115] In the present embodiment, a case where the external eye refractive power (external eye value) of the subject's eye E is -6.50D for spherical eye refractive power, -1.00D for cylindrical eye refractive power, and 135 degrees for astigmatism axis angle is cited as an example. At this time, as the initial correction amount of the subject's eye E, a spherical correction amount of -6.50D, a cylindrical correction amount of -1.00D, and an astigmatism axis correction amount of 135 degrees can be input. For example, the control unit 70 adjusts the spherical refractive power of the variable focus lens 61 to +3.50D. In addition, for example, the control unit 70 changes the difference in the axial angles of the cylindrical lens 62a and the cylindrical lens 62b and adjusts the cylindrical refractive power to -1.00D. In addition, for example, the control unit 70 adjusts the composite axial angle of the cylindrical lens 62a and the cylindrical lens 62b to 135 degrees. Furthermore, for example, the control unit 70 arranges the opening of the first auxiliary lens disk 50 a and the first spherical lens 51 a (spherical refractive power −10.00 D) of the second auxiliary lens disk 50 b in the inspection window 43 .

[0116] Thus, the eye E is corrected in such a way that the sight mark beam from the display 31 converges on the retina of the eye E. That is, the eye E is corrected with a spherical correction amount of -6.50 synthesized by the variable focus lens 61 and the first spherical lens 51a. In addition, the eye E is corrected by the Stokes lens 62 with a cylindrical correction amount of -1.0D and an astigmatism axis correction amount of 135 degrees.

[0117] <Distance vision test>

[0118] After the examiner corrects the subject's eye E with the initial correction amount, the examiner operates the examiner's controller 10 to start the distance vision test at a predetermined distance (here, the distance vision test distance) of the subject's eye E. The control unit 70 switches the display 31 to the distance vision configuration. In addition, the control unit 70 displays the Landol ring sight mark having a predetermined visual acuity value as an initial sight mark on the display 31. As an example, the Landol ring sight mark having a visual acuity value of 0.8 is displayed as the initial sight mark.

[0119] The examiner operates the examiner's controller 10 to switch the Landau ring sight mark, while asking the subject about the direction of the notch of the ring of the Landau ring sight mark. For example, if the subject's answer is correct, the visual acuity value of the Landau ring sight mark is switched to a higher visual acuity value. That is, the scale of the visual acuity value of the Landau ring sight mark is increased by one, and switched to a value larger than the current value. As an example, the visual acuity value of the Landau ring sight mark is switched from 0.8 to 0.9. For example, if the subject's answer is incorrect, the visual acuity value of the Landau ring sight mark is switched to a lower visual acuity value. That is, the scale of the visual acuity value of the Landau ring sight mark is reduced by one, and switched to a value smaller than the current value. As an example, the visual acuity value of the Landau ring sight mark is switched from 0.8 to 0.7. The examiner repeats these steps to find the highest visual acuity value of the Landau ring sight mark that the subject's eye E can recognize.

[0120] Next, the examiner asks the subject about the direction of the notch of the ring of the Landau ring while operating the examiner's controller 10 to switch the correction amount of the subject's eye E. For example, if the subject's answer is correct, the spherical correction amount is switched to a correction amount that is one level weaker. That is, the spherical correction amount is reduced by one step and switched to a value that is smaller than the current value. As an example, the spherical correction amount 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's answer is wrong, the spherical correction amount is switched to a correction amount that is one level stronger. That is, the spherical correction amount is increased by one step and switched to a value that is larger than the current value. As an example, the spherical correction amount is switched from -6.50D to -6.75D by changing the spherical refractive power of the variable focus lens 61 from +3.50D to +3.75D.

[0121] The control unit 70 configures the first spherical lens 51a or the second spherical lens 51b as needed in accordance with the spherical correction amount added to the subject's eye E. Of course, the cylindrical correction amount and the astigmatism axis correction amount can also be switched together with the spherical correction amount according to the subject's answer. It should be noted that in the present embodiment, the spherical correction amount can be changed slightly by one step than -0.25D using the variable focus lens 61. Similarly, the cylindrical correction amount can be changed slightly by one step than -0.25D using the cylindrical lens 62a and the cylindrical lens 62b of the Stokes lens 62. The examiner repeats these steps to obtain the value of the corrected refractive power that is closest to positive that can obtain the highest visual acuity of the subject's eye E (i.e., the complete correction value).

[0122] <Join degree check>

[0123] After completing the distance vision test of the subject's eye E, the examiner starts the addition test by operating the examiner's controller 10 to correct the subject's eye E with a full correction 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 accommodative power of the subject's eye E, and the refractive power of the subject's eye E, and sets the initial addition. Of course, the control unit 70 may also automatically determine and set the necessity of addition and the initial addition.

[0124] In this embodiment, a case where the full correction value (subjective value) of the subject's eye E is calculated as -6.00D for spherical correction, -1.25D for cylindrical correction, 135 degrees for astigmatism axis correction, and the initial addition power is set to +1.00D is taken as an example. It should be noted that in the addition power test using the conventional lens unit 200, the subject's eye E is corrected with the full correction value, and the cross cylindrical lens is arranged in such a way that -0.50D becomes 0 degrees and +0.50D becomes 90 degrees, and the initial addition power is increased or decreased. In this embodiment, the subject's eye E is corrected with the full correction value, and the state in which the cross cylindrical lens is arranged is reproduced using the Stokes lens 62, and then the initial addition power is increased or decreased.

[0125] First, the control unit 70 creates a first state in which the subject's eye E is corrected with a full correction value and a cross cylindrical lens is arranged. The control unit 70 assumes that the cylindrical lens 250 of the conventional lens unit 200 with a cylindrical refractive power of -1.25D is arranged at 135 degrees and the cross cylindrical lens 270 is arranged so that +0.50D becomes 90 degrees, and the cylindrical lens 62a and the cylindrical lens 62b of the Stokes lens 62 are rotated, and the cylindrical correction amount of the subject's eye E is corrected to -1.25D, and the astigmatism axis angle is corrected to 135 degrees.

[0126] Figure 8: is a diagram showing the change in the combined refractive power of the cylindrical lens 250 and the cross cylindrical lens 270. The refractive power of the cylindrical lens 250 changes with a sine curve α passing through -1.25D at 45 degrees, and the refractive power of the cross cylindrical lens 270 changes with a sine curve β passing through +0.50D at 90 degrees. The vertex of the sine curve γ of the combined refractive power of the cylindrical lens 250 and the cross cylindrical lens 270 is at a position of 116 degrees. Therefore, the control unit 70 adjusts the difference in the axial angles of the cylindrical lens 62a and the cylindrical lens 62b of the Stokes lens 62 to produce a difference in cylindrical refractive power of -1.25D, and aligns the combined axial angle of the cylindrical lens 62a and the cylindrical lens 62b at a position of 116 degrees instead of 135 degrees. As a result, the subject's eye E reproduces and corrects 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 cylindrical lens 270 (+0.50 D in the 90-degree direction) are synthesized.

[0127] At this time, the spherical refractive power ΔS is generated by the amount of correction of the astigmatism axis of the eye E to be examined and the amount of deviation of the composite axis angle of the cylindrical lens 62a and the cylindrical lens 62b. The spherical refractive power ΔS is the difference between the refractive power of the cylindrical lens 250 and the composite refractive power of the cylindrical lens 250 and the cross cylindrical lens 260 (in Figure 8 It should be noted that the spherical refractive power ΔS changes according to the offset of the astigmatism axis correction amount and the synthetic axis angle, but it is less than one step (0.25D) and is a tiny amount. For example, in this embodiment, the spherical refractive power ΔS becomes -0.15D.

[0128] The control unit 70 changes the spherical refractive power of the zoom lens 61 to +4.00D and switches the configuration of the first spherical lens 51a (-10.00D), thereby correcting the subject's eye E with a spherical correction amount of -6.00D. However, since the spherical refractive power ΔS is generated by the Stokes lens 62, the spherical refractive power of the zoom lens 61 is actually changed to +3.85D, and the subject's eye E is corrected with a spherical correction amount of -6.15D. For example, by using the zoom lens 61 in this way, it is possible to finely adjust the value in consideration of the spherical refractive power ΔS.

[0129] The examiner operates the examiner controller 10 to display the cross-grid sight mark on the display 31. In addition, the examiner operates the examiner controller 10 and presses a switch not shown in the figure to switch between a first state in which the subject's eye E is corrected with a full correction value and a cross cylindrical lens is configured, and a second state in which an initial addition of +1.00D is further added in the first state. The control unit 70 changes the spherical refractive power of the variable focus lens 61 according to an operation signal from the switch not shown in the figure. Here, the spherical refractive power of the variable focus lens 61 is changed to +3.85D or +4.85D. As a result, the spherical correction amount of the subject's eye E is switched between -6.00D (actually -6.15D) without the initial addition and -5.00D (actually -5.15D) with the initial addition.

[0130] The examiner asks the subject how the cross-grid sight mark looks, and changes the added power according to the subject's answer. The control unit 70 changes the spherical refractive power of the variable focus lens 61 in accordance with the spherical refractive power added to the subject's eye E, and arranges the first spherical lens 51a or the second spherical lens 51b as needed. The examiner repeats these steps and determines the level at which the vertical and horizontal lines of the cross-grid sight mark are equally visible as the appropriate added power for the subject's eye E.

[0131] <Near Vision Test>

[0132] After the examiner completes the addition test of the eye E to be examined, the examiner operates the examiner controller 10 to start the near vision test at a predetermined distance (here, the near vision test distance) of the eye E to be examined. The control unit 70 switches the display 31 to a near vision configuration. It should be noted that in the conventional lens unit 200, the cross cylindrical lens 270 is removed when switching from the addition test to the near vision test. Therefore, in the present embodiment, the variable focus lens 61 and the Stokes lens 62 (cylindrical lens 62a and cylindrical lens 62b) are also adjusted to reproduce the state in which the cross cylindrical lens 270 is removed. The maximum visual acuity value is also obtained in the near vision test, but this process is basically the same as the distance vision test and is therefore omitted.

[0133] As described above, for example, the subjective optometry device of this embodiment controls a first correction unit for changing the spherical refractive power of the sight mark beam using a variable focal length component (here, the variable focal lens 61) and a second correction unit for changing the spherical refractive power of the sight mark beam by switching the configuration of optical components (here, the first spherical lens 51a and the second spherical lens 51b), and performs the change of the spherical refractive power of the sight mark beam. For example, the variable focal component can continuously change the spherical refractive power, so that the spherical correction amount of the eye to be inspected can be finely adjusted to appropriately correct the eye to be inspected. However, on the other hand, it is technically difficult for the variable focal component to produce a high degree of spherical refractive power, and the change of the spherical refractive power achieved by the variable focal component alone may not be able to cope with the situation where the spherical correction amount of the eye to be inspected is large. In this embodiment, by combining the variable focal lens and the first spherical lens or the second spherical lens as needed, a high degree of spherical refractive power can be produced. Therefore, even in the case where the spherical correction amount of the eye to be inspected is large, it is possible to appropriately correct the eye to be inspected and measure the eye refractive power of the eye to be inspected with high accuracy.

[0134] It should be noted that, for example, in the past, if the spherical lens is switched in front of the eye to be examined, there may be a sense of disharmony due to the sudden change from one spherical refractive power to another spherical refractive power (in other words, a seam appears in the spherical refractive power), or annoyance due to the switching sound of the spherical lens. In this embodiment, the desired spherical refractive power is adjusted by using a variable focus component, and the spherical refractive power changes seamlessly (seamlessly), so that the measurement can be carried out without a sense of disharmony. In addition, since the switching sound of the spherical lens is not generated, annoyance can be reduced.

[0135] In addition, for example, in the subjective optometry device of the present embodiment, the first correction unit can change the spherical refractive power of the sight mark light beam within the range of the first refractive power, and when the changed spherical refractive power after the spherical refractive power of the sight mark light beam exceeds the range of the first refractive power of the spherical refractive power of the first correction unit, at least the configuration of the optical component is switched. For example, in a state where a variable focus component is configured in front of the eye of the subject, the spherical refractive power can be continuously changed within the range of the first refractive power, and the subjective examination of the eye of the subject can be smoothly promoted. In addition, for example, in a state where a variable focus component and an optical component are configured in front of the eye of the subject, the spherical refractive power (synthetic spherical refractive power) can be enlarged by the optical component and the synthetic spherical refractive power can be continuously changed by the variable focus component, and the subjective examination of the eye of the subject can be smoothly promoted.

[0136] In addition, for example, in the subjective optometry device of the present embodiment, the step length of the spherical refractive power of the sight mark beam that can be changed by the first correction unit is smaller than the step length of the spherical refractive power of the sight mark beam that can be changed by the second correction unit. Thus, the spherical refractive power of the sight mark beam can be changed more finely using the variable focus component. In addition, even in the case of combining the variable focus component and the optical component, the spherical refractive power of the sight mark beam can be changed more finely within the range of their combined spherical refractive power.

[0137] In addition, for example, in the addition test for measuring the addition of the correction amount at a predetermined test distance relative to the eye to be tested, the subjective optometry device of the present embodiment controls the Stokes lens that can rotate independently in front of the eye to be tested, and changes 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 of the eye to be tested, where the composite axis angle is an axis angle that takes into account the offset of the astigmatism axis correction amount that occurs when the optical components and the cross cylindrical lenses are configured in order to correct the eye to be tested with the cylindrical correction amount and the astigmatism axis correction amount. For example, in a state where the Stokes lens is configured in front of the eye to be tested, by adjusting the difference in the axis angles by rotating the two cylindrical lenses separately, the cylindrical refractive power can be continuously changed, and by adjusting the composite axis angle by rotating the two cylindrical lenses as a whole, the astigmatism axis angle can be continuously changed. At this time, in this embodiment, since the offset of the astigmatism axis correction amount caused by the Stokes lens is taken into consideration, the cylindrical correction amount and the astigmatism axis correction amount of the subject's eye can be appropriately corrected and the eye refractive power of the subject's eye can be measured with high accuracy.

[0138] It should be noted that, for example, in the past, if a cylindrical lens is switched in front of the eye to be examined, a sense of disharmony caused by the change of the cylindrical refractive power in a state where a seam appears, and annoyance caused by the switching sound of the cylindrical lens, are generated, as in the case of switching the spherical lens described above. However, in this embodiment, by using a Stokes lens to adjust the desired cylindrical refractive power, the cylindrical refractive power changes seamlessly (seamlessly), and no switching sound is generated, so that the sense of disharmony and annoyance can be reduced.

[0139] In addition, for example, the subjective optometry device of the present embodiment corrects the deviation of the spherical correction amount of the eye to be examined caused by aligning the first cylindrical lens and the second cylindrical lens at the synthetic axis angle by arranging a correcting optical member in front of the eye to be examined. Thus, even when the cylindrical refractive power and the astigmatism axis angle of the sight target beam are changed by using a Stokes lens to adjust the cylindrical correction amount and the astigmatism axis correction amount of the eye to be examined, the deviation of the spherical correction amount of the eye to be examined is appropriately corrected by the correcting optical member, so that the eye refractive power of the eye to be examined can be measured with high accuracy.

[0140] In addition, for example, in the subjective optometry device of the present embodiment, the corrective optical component for correcting the offset of the spherical correction amount of the eye to be inspected is a variable focus component (here, a variable focus lens 61) with a variable focal length, and the offset of the spherical correction amount of the eye to be inspected is corrected by changing the spherical refractive power of the variable focus component. For example, the offset of the spherical correction amount caused by the first cylindrical lens and the second cylindrical lens may change at a value smaller than the interval (0.25D) of the multiple spherical lenses composed of the previous lens unit. Therefore, when a spherical optical component with a constant focal length is used as the corrective optical component, it may not be possible to fully cope with the offset of the spherical correction amount, but by using a variable focus component with a variable focal length, the offset of the spherical correction amount can be finely coped with. As a result, the eye to be inspected can be appropriately corrected with the desired spherical correction amount.

[0141] In addition, for example, the subjective optometry device of the present embodiment obtains the addition of the eye to be examined, and switches between a first state in which the first cylindrical lens and the second cylindrical lens are aligned at a synthetic axis angle and a second state in which a correction optical member based on the addition is arranged in the first state. That is, in a state in which the eye to be examined is corrected with a predetermined spherical correction amount, a cylindrical correction amount, and an astigmatism axis correction amount, and the offset of the spherical correction amount is corrected, the first state in which the addition is not added and the second state in which the addition is added are switched. Thus, the most suitable addition for the eye to be examined can be measured with high accuracy.

[0142] In addition, for example, the subjective optometry device of this embodiment uses both a correction optical member for correcting the deviation of the spherical correction amount of the eye to be examined and a correction optical member for correcting the eye to be examined with the spherical correction amount. Thus, the spherical correction amount for correcting the eye to be examined can be easily adjusted in consideration of the deviation of the spherical correction amount of the eye to be examined.

[0143] <Modification>

[0144] In the subjective optometry device of the present embodiment, the structure of adjusting the spherical refractive power by 0.25D in each step is cited as an example for explanation, but it is not limited to this. For example, the subjective optometry device of the present embodiment can continuously change the spherical refractive power of the variable focus lens 61. Therefore, it can also be configured as a step to adjust the spherical refractive power by a value less than 0.25D (for example, 0.10D, 0.05D, etc.). Similarly, in the subjective optometry device of the present embodiment, the structure of adjusting the cylindrical refractive power by 0.25D in each step is cited as an example for explanation, but it is not limited to this. For example, the subjective optometry device of the present embodiment can continuously change the cylindrical refractive power of the Stokes lens 62. Therefore, it can also be configured as a step to adjust the cylindrical refractive power by a value less than 0.25D (for example, 0.10D, 0.05D, etc.).

[0145] In the subjective optometry device of the present embodiment, the configuration of the spherical correction amount of the subject's eye E, the spherical refractive power of the variable focus lens 61, and the configuration of the first spherical lens 51a and the second spherical lens 51b is pre-established as an example for explanation, but the invention is not limited thereto. For example, the subjective optometry device of the present embodiment may also be configured to determine whether to configure the first spherical lens 51a and the second spherical lens 51b based on the spherical correction amount of the subject's eye E. In this case, the control unit 70 may determine whether to configure the first spherical lens 51a and the second spherical lens 51b based on whether the spherical correction amount of the subject's eye E exceeds a prescribed threshold value. For example, the prescribed threshold value may be a maximum value or a minimum value based on the range of spherical refractive power that can be adjusted using the variable focus lens 61.

[0146] In this way, the subjective optometry device of this embodiment determines whether to arrange the optical member (here, the first spherical lens 51a and the second spherical lens 51b) in front of the eye E to be examined based on the spherical correction amount of the eye to be examined (i.e., the changed spherical refractive power after the spherical refractive power of the sight mark beam is changed), and at least switches the arrangement of the optical member based on the determination result. Thus, for example, it is possible to easily grasp the situation that the spherical correction amount of the eye to be examined is large and the spherical refractive power of the variable focus member (here, the variable focus lens 61) alone cannot cope with it, and the refractive power of the eye to be examined is measured with high accuracy by combining the variable focus member and the optical member.

[0147] In addition, for example, the subjective optometry device of this embodiment determines whether to place an optical component in front of the eye of the subject based on the spherical correction amount of the eye of the subject (the changed spherical refractive power of the sight mark beam) and the range of the refractive power of the correction unit. Thus, in the case where the variable optical component alone cannot cope with the situation, the optical component can be appropriately placed to measure the refractive power of the eye of the subject with high accuracy.

[0148] In the subjective optometry device of the present embodiment, in the aforementioned distance vision test and near vision test, etc., sometimes the initial correction amount of the subject's eye E or the correction amount switched after the initial correction amount is further changed to a different correction amount. At this time, the control unit 70 can change whether to control only the variable focus component 61 or simultaneously control the variable focus component 61 and the first spherical lens 51a (or the second spherical lens 51b) according to the change amount between the two correction amounts. For example, the control unit 70 can control only the variable focus component 61 when the change amount between the two correction amounts does not exceed the prescribed change amount. In addition, for example, the control unit 70 can simultaneously control the variable focus component 61 and the first spherical lens 51a (the second spherical lens 51b) when the change amount between the two correction amounts exceeds the prescribed change amount. For example, the change amount between the two correction amounts can be preset, and as an example, it can be ±3.00D, etc.

[0149] In this way, when the spherical correction amount of the eye to be examined (the changed spherical refractive power after the spherical refractive power of the sight mark beam is changed) is adjusted from the first changed spherical refractive power to the second changed spherical refractive power different from the first changed spherical refractive power, the subjective optometry device of this embodiment controls only the first correction unit to change the focal length of the variable focus member according to the amount of change between the first changed spherical refractive power and the second changed spherical refractive power. Thus, for example, the spherical correction amount required for correction of the eye to be examined can be easily adjusted, and the eye refractive power of the eye to be examined can be smoothly measured.

[0150] In the subjective optometry device of the present embodiment, it can be configured such that after switching from the initial correction amount to a different correction amount with respect to the eye E to be examined, the subjective value (for example, the complete correction value) is obtained by controlling only the variable focus member 61. In this case, it is also possible to set whether to pre-configure the first spherical lens 51a or the second spherical lens 51b on the inspection window 43 according to the initial correction amount of the eye E to be examined. For example, when the initial correction amount of the eye E to be examined is a spherical correction amount of -1.00D, -1.00D can be generated using only the variable focus member 61 (spherical refractive power of -5.00D to +5.00D). In addition, for example, when the initial correction amount of the eye E to be examined is a spherical correction amount of -4.50D, -4.5D can be generated by combining the variable focus member 61 and the first spherical lens 51a (spherical refractive power of -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 (that is, the difference between the initial correction amount and the final correction amount) can be roughly grasped by experiments, simulations, etc. Therefore, by pre-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 the measurement of the subject's eye E, and more seamless response can be achieved. It should be noted that when such a structure is formed, a plurality of spherical lenses can also be provided so that the spherical refractive power thereof can be changed in a predetermined step size (for example, 3.00D units, etc.).

[0151] Description of Reference Numerals

[0152] 1 Housing

[0153] 2 Presentation Window

[0154] 10 Inspector Controller

[0155] 30 Light projection optical system

[0156] 40 Eye Refractive Power Measurement Unit

[0157] 43 Inspection window

[0158] 60 Control Department

[0159] 100 Subjective refraction device.

Claims

1. A subjective optometry device for measuring the refractive power of an eye to be examined in a subjective manner, characterized in that: have: a correction unit, disposed in front of the eye to be inspected, to change the optical characteristics of the sight mark light beam emitted from the sight mark presenting unit; and a control unit for controlling the correction unit, The correction unit comprises a first correction unit and a second correction unit, wherein the first correction unit is used to change the spherical refractive power of the sight mark beam by using a variable focus component with a variable focal length, and the second correction unit is used to change the spherical refractive power of the sight mark beam by switching the configuration of optical components. The control unit controls the first correction unit and the second correction unit to change the spherical refractive power of the sight mark beam.

2. The subjective optometry device according to claim 1, characterized in that: The first correction unit can make the spherical refractive power of the sight mark beam vary within a first refractive power range, When the changed spherical refractive power of the sight mark beam exceeds the range of the first refractive power of the first correcting unit, the control unit controls at least the second correcting unit to switch the configuration of the optical component.

3. The subjective optometry device according to claim 2, characterized in that: The subjective optometry device includes a determination unit for determining whether to arrange the optical member based on the changed spherical refractive power of the sight mark beam. The control unit controls at least the second correction unit to switch the arrangement of the optical member based on the determination result of the determination unit.

4. The subjective optometry device according to claim 3, characterized in that: The determination unit determines whether to switch the arrangement of the optical member based on the changed spherical refractive power of the sight mark beam and the range of the first refractive power of the first correcting unit.

5. The subjective optometry device according to any one of claims 1 to 4, characterized in that: The step length with which the first correction unit can change the spherical refractive power of the sight mark beam is smaller than the step length with which the second correction unit can change the spherical refractive power of the sight mark beam.

6. The subjective optometry device according to any one of claims 1 to 5, characterized in that: When the control unit adjusts the changed spherical refractive power of the sight mark light beam from a first changed spherical refractive power to a second changed spherical refractive power different from the first changed spherical refractive power, the control unit only controls the first correction unit to change the focal length of the variable-focus component according to the amount of change between the first changed spherical refractive power and the second changed spherical refractive power.

7. A subjective optometry procedure, used in a subjective optometry device, The subjective optometry device comprises a correction unit, which is arranged in front of the eye to be examined and changes the optical characteristics of the sight mark beam emitted from the sight mark presenting unit, and comprises a first correction unit and a second correction unit, wherein the first correction unit is used to change the spherical refractive power of the sight mark beam using a variable focus component with a variable focal length, and the second correction unit is used to change the spherical refractive power of the sight mark beam by switching the configuration of the optical component, The subjective optometry device is used to measure the refractive power of the eye to be examined in a subjective manner. The subjective refraction procedure is characterized by: The processor of the subjective optometry device executes the subjective optometry program so that the subjective optometry device executes a control step of controlling the correction unit, In the control step, the first correction unit and the second correction unit are controlled to perform a change in the spherical refractive power of the sight mark beam.

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