Eye examination device

Abstract

To provide an optometer capable of favorably measuring optical characteristics of a subject's eye.SOLUTION: An optometer for measuring optical characteristics of a subject's eye, comprises: an objective measurement optical system for objectively measuring the optical characteristics of the subject's eye; a subjective measurement optical system for subjectively measuring optical characteristics of the subject's eye; first control means for executing first alignment processing based on a first alignment allowable range for determining a positional deviation between the subject's eye and the objective measurement optical system; and second control means for executing second alignment processing based on a second alignment allowable range for determining a positional deviation between the subject's eye and the subjective measurement optical system, where the second alignment allowable range is wider than the first alignment allowable range.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​(1) An optometry device according to a first aspect of the present disclosure is an optometry device for measuring the optical properties of an eye to be examined, comprising: a first light projection optical system for projecting a measurement light beam onto the fundus of the eye to be examined; a light receiving optical system for receiving a reflected light beam reflected from the fundus of the eye by a detector; an objective measurement optical system for objectively measuring the optical properties of the eye to be examined; a second light projection optical system for projecting a target light beam toward the eye to be examined; a corrective optical system disposed in the optical path of the second light projection optical system for changing the optical properties of the target light beam; a subjective measurement optical system for subjectively measuring the optical properties of the eye to be examined; a first control means for executing a first alignment process based on a first alignment tolerance range for determining the misalignment between the eye to be examined and the objective measurement optical system; and a second control means for executing a second alignment process based on a second alignment tolerance range for determining the misalignment between the eye to be examined and the subjective measurement optical system. When the measurement of the eye under examination is switched from one of the objective measurement using the objective measurement optical system to the other of the subjective measurement using the subjective measurement optical system, a change control means is provided to change the first alignment tolerance range corresponding to the objective measurement and the second alignment tolerance range corresponding to the subjective measurement. The second alignment tolerance range is wider than the first alignment tolerance range. The change control means sets the second alignment tolerance range when the optical properties of the eye under examination are objectively measured by the objective measurement optical system while the optical properties of the eye under examination are being subjectively measured by the subjective measurement optical system. It is characterized by the following: (2) An optometry device according to a second aspect of the present disclosure is an optometry device for measuring the optical properties of an eye to be examined, comprising: a first light projection optical system that projects a measurement light beam onto the fundus of the eye to be examined; a light receiving optical system that receives a reflected light beam, which is reflected from the measurement light beam at the fundus, using a detector; an objective measurement optical system for objectively measuring the optical properties of the eye to be examined; a second light projection optical system that projects a target light beam toward the eye to be examined; and a corrective optical system disposed in the optical path of the second light projection optical system and changing the optical properties of the target light beam; and a subjective measurement optical system for subjectively measuring the optical properties of the eye to be examined. A first control means that performs a first alignment process based on a first alignment tolerance range for determining the misalignment between the eye under examination and the objective measurement optical system, a second control means that performs a second alignment process based on a second alignment tolerance range for determining the misalignment between the eye under examination and the subjective measurement optical system, and when the measurement of the eye under examination switches from one of the objective measurement by the objective measurement optical system to the other, the first alignment tolerance range corresponding to the objective measurement and the subjective measurement by the subjective measurement optical system The system comprises a second alignment tolerance range corresponding to the measurement, and a change control means for changing the second alignment tolerance range, wherein the second alignment tolerance range is wider than the first alignment tolerance range, the first control means adjusts the first relative positional relationship between the eye under examination and the objective measurement optical system as the first alignment process, the second control means adjusts the second relative positional relationship between the eye under examination and the subjective measurement optical system as the second alignment process, and the change control means adjusts the first alignment tolerance range and the subjective measurement optical system in the subjective measurement. The system is capable of changing the first alignment tolerance range, and in the subjective measurement, the first alignment tolerance range is set by the change control means, and the second control means starts adjusting the second positional relationship with respect to the first alignment tolerance range. When the second positional relationship falls within the first alignment tolerance range, the change control means changes it to the second alignment tolerance range, and the second control means adjusts the second positional relationship with respect to the second alignment tolerance range. ( 3 ) The first of the disclosures 3 An optometry program according to the embodiment comprises an objective measurement optical system for objectively measuring the optical properties of an eye, having a first projection optical system that projects a measurement light beam onto the fundus of the eye to be examined, and a light receiving optical system that receives the reflected light beam, which is reflected from the measurement light beam at the fundus, using a detector; a second projection optical system that projects a target light beam toward the eye to be examined, and a corrective optical system disposed in the optical path of the second projection optical system that changes the optical properties of the target light beam, having a subjective measurement optical system for subjectively measuring the optical properties of the eye to be examined, and is used in an optometry device for measuring the optical properties of an eye to be examined, comprising: a first control step executed by the processor of the optometry device to perform a first alignment process based on a first alignment tolerance range for determining the misalignment between the eye to be examined and the objective measurement optical system; and a second control step to perform a second alignment process based on a second alignment tolerance range for determining the misalignment between the eye to be examined and the subjective measurement optical system. A change control step is performed when the measurement of the eye under examination switches from one of the objective measurement using the objective measurement optical system to the other of the subjective measurement using the subjective measurement optical system, to change the first alignment tolerance range corresponding to the objective measurement and the second alignment tolerance range corresponding to the subjective measurement. of The aforementioned eye examination device is to perform the procedure.The second alignment tolerance range is wider than the first alignment tolerance range. The change control step sets the second alignment tolerance range when the optical properties of the eye under examination are objectively measured by the objective measurement optical system while the optical properties of the eye under examination are subjectively measured by the subjective measurement optical system. It is characterized by the following: (4) An ophthalmography program according to a fourth aspect of the present disclosure comprises: a first light projection optical system that projects a measurement beam onto the fundus of the eye to be examined; a light receiving optical system that receives a reflected beam of light from the fundus of the eye to be examined using a detector; an objective measurement optical system for objectively measuring the optical properties of the eye to be examined; a second light projection optical system that projects a target beam toward the eye to be examined; and a corrective optical system disposed in the optical path of the second light projection optical system that changes the optical properties of the target beam; and a subjective measurement optical system for subjectively measuring the optical properties of the eye to be examined. An eye examination program used in the device, comprising: a first control step executed by the processor of the eye examination device to perform a first alignment process based on a first alignment tolerance range for determining the misalignment between the eye to be examined and the objective measurement optical system; a second control step to perform a second alignment process based on a second alignment tolerance range for determining the misalignment between the eye to be examined and the subjective measurement optical system; and a method for measuring the eye to be examined, which separates objective measurement by the objective measurement optical system from subjective measurement by the subjective measurement optical system to the other. When switching, the optometry device is instructed to perform a change control step that changes the first alignment tolerance range corresponding to the objective measurement and the second alignment tolerance range corresponding to the subjective measurement, wherein the second alignment tolerance range is a wider tolerance range than the first alignment tolerance range, the first control step adjusts the first relative positional relationship between the eye under examination and the objective measurement optical system as the first alignment process, and the second control step adjusts the first relative positional relationship between the eye under examination and the subjective measurement optical system as the second alignment process. 2. The positional relationship is adjusted, and the change control step makes it possible to change the first alignment tolerance range and the second alignment tolerance range in the subjective measurement, and in the subjective measurement, the first alignment tolerance range is set by the change control step, and the adjustment of the second positional relationship with respect to the first alignment tolerance range is started by the second control step, and when the second positional relationship falls within the first alignment tolerance range, the change control step changes it to the second alignment tolerance range,The second control step is characterized in that the second positional relationship with respect to the second alignment tolerance range is adjusted. [Brief explanation of the drawing]

[0007] [Figure 1] This is an external view of the eye examination device. [Figure 2] This is a diagram showing the measurement section for the left eye. [Figure 3] This is a schematic diagram showing the inside of the device as viewed from the front. [Figure 4] This is a schematic diagram showing the inside of the device as viewed from the side. [Figure 5] This is a schematic diagram showing the inside of the device as viewed from above. [Figure 6] This is a diagram of the control system. [Figure 7] This is an example of an anterior segment image of the left eye. [Figure 8] This diagram illustrates the acceptable range of alignment for objective measurements. [Figure 9] This diagram illustrates the acceptable alignment range for subjective measurement. [Modes for carrying out the invention]

[0008] <Overview> An overview of the optometry device according to the embodiments of this disclosure will be described. In this embodiment, the left-right direction of the optometry device is the X direction, the up-down direction is the Y direction, and the front-back direction (working distance direction) is the Z direction. The reference numerals L and R indicate the left eye and right eye, respectively. The items classified in <> below may be used independently or in relation to each other.

[0009] The optometry device of this embodiment is a device capable of measuring the optical properties of the eye under examination. For example, the optometry device may include an objective measurement optical system for objectively measuring the optical properties of the eye under examination. Alternatively, for example, the optometry device may include a subjective measurement optical system for subjectively measuring the optical properties of the eye under examination.

[0010] <Objective measurement optical system> The ophthalmic examination device of the present embodiment may include an objective measurement optical system (for example, the objective measurement optical system 10). For example, the objective measurement optical system may include a first light projection optical system (for example, the projection optical system 10a) that projects a measurement light beam onto the fundus of the eye to be examined, and a light reception optical system (for example, the light reception optical system 10b) that receives the reflected light beam reflected by the measurement light beam at the fundus with a detector. In addition, as objective optical characteristics, at least any one of the eye refractive power (for example, spherical power, cylindrical power, astigmatism axis angle, etc.), the eye axis length, the corneal shape, etc. may be measured.

[0011] The first light projection optical system may include a first light projection optical system for the left eye and a first light projection optical system for the right eye provided in a pair on the left and right. For example, the first light projection optical system for the left eye and the first light projection optical system for the right eye may each be configured of the same member, or at least some of the members may be configured of different members. Also, for example, the first light projection optical system for the left eye and the first light projection optical system for the right eye may be configured to share at least some of the members that constitute each of them.

[0012] The first light reception optical system may include a first light reception optical system for the left eye and a first light reception optical system for the right eye provided in a pair on the left and right. For example, the first light reception optical system for the left eye and the first light reception optical system for the right eye may each be configured of the same member, or at least some of the members may be configured of different members. Also, for example, the first light reception optical system for the left eye and the first light reception optical system for the right eye may be configured to share at least some of the members that constitute each of them.

[0013] <Subjective measurement optical system> The ophthalmic apparatus of this embodiment may include subjective measurement means (for example, the subjective measurement optical system 25). For example, the subjective measurement optical system may include a second light projection optical system (for example, the light projection optical system 30) that projects a target light beam toward the eye to be examined, and a correction optical system (for example, the correction optical system 60) that is disposed in the optical path of the second light projection optical system and changes the optical characteristics of the target light beam. Note that as subjective optical characteristics, at least any one of eye refractive power (spherical power, cylindrical power, astigmatism axis angle, etc.), contrast sensitivity, binocular vision function (deviation amount, stereoscopic vision function, etc.), etc. may be measured.

[0014] <Second light projection optical system> The second light projection optical system projects a target light beam toward the eye to be examined. The second light projection optical system may include at least one optical member that guides the target light beam toward the eye to be examined.

[0015] The second light projection optical system may include target presentation means. The target presentation means presents a target to the eye to be examined. In this case, the second light projection optical system projects the target light beam emitted from the target presentation means toward the eye to be examined. For example, a display (for example, the display 31) can be used as the target presentation means. Also, for example, a light source and a DMD (Digital Micromirror Device) can be used as the target presentation means. Generally, since the DMD has a high reflectivity and is bright, the light amount of the target light beam can be maintained more than when using an LCD. Also, for example, a visible light source for target presentation and a target plate can be used as the target presentation means. The target plate is a rotatable disk plate and may have a plurality of targets. The targets are switched and arranged by rotating the target plate by a motor or the like on the optical path through which the target light beam is guided to the eye to be examined.

[0016] The second light projection optical system may have a pair of second light projection optical systems, one for the left eye and one for the right eye. For example, the second light projection optical system for the left eye and the second light projection optical system for the right eye may each be composed of the same material, or at least some of the material may be different. Also, for example, the second light projection optical system for the left eye and the second light projection optical system for the right eye may share at least some of the material that constitutes each of them.

[0017] <Correction optical system> The corrective optical system is placed in the optical path of the second light projection optical system and alters the optical properties of the target light beam (at least one of the following: spherical power, cylindrical power, astigmatism axis angle, polarization characteristics, aberration, etc.).

[0018] For example, the corrective optical system may be capable of changing at least one of the spherical power, cylindrical power, and astigmatism axis angle of the target light beam by controlling the optical elements. The optical elements may be at least one of the following: a spherical lens, a cylindrical lens, a cross-cylinder lens, a rotary prism, a wavefront modulation element, a variable focus lens, etc. Of course, other optical elements may also be used.

[0019] Furthermore, for example, the corrective optical system may correct the spherical power of the eye under examination by optically changing the presentation distance of the target to the eye under examination. In this case, the target presentation means may be moved in the optical axis direction in order to optically change the presentation distance of the target. Alternatively, in this case, an optical element (for example, a spherical lens) placed in the optical path may be moved in the optical axis direction in order to optically change the presentation distance of the target.

[0020] The corrective optical system may also be a combination of a configuration for controlling optical elements, a configuration for moving a target presentation means in the optical axis direction, and a configuration for moving optical elements arranged in the optical path in the optical axis direction.

[0021] The corrective optical system may be configured such that an optical element is placed between a target presentation means and an optical member for guiding the target light beam from a second light projection optical system toward the eye under examination, and the optical properties of the target light beam are changed by controlling the optical element. In other words, the corrective optical system may be configured as a phantom lens refractometer (phantom corrective optical system). In this case, the target light beam corrected by the corrective optical system is guided to the eye under examination via the optical member.

[0022] The corrective optical system may have a pair of corrective optical systems, one for the left eye and one for the right eye. For example, the corrective optical system for the left eye and the corrective optical system for the right eye may each be composed of the same material, or at least some of the material may be different. Also, for example, the corrective optical system for the left eye and the corrective optical system for the right eye may share at least some of the material that makes up each of them.

[0023] <Measurement Unit> The optometry device of this embodiment may include a measurement unit (e.g., a measurement unit 7). The measurement unit includes an objective measurement optical system and a subjective measurement optical system, and has a pair of left-eye measurement units (e.g., a left-eye measurement unit 7L) and a right-eye measurement unit (e.g., a right-eye measurement unit 7R). That is, it has a left-eye measurement unit including an objective measurement optical system and a subjective measurement optical system for the left eye, and a right-eye measurement unit including an objective measurement optical system and a subjective measurement optical system for the right eye. The subjective measurement optical system for the left eye includes a second light projection optical system for the left eye and a corrective optical system for the left eye. The subjective measurement optical system for the right eye includes a second light projection optical system for the right eye and a corrective optical system for the right eye. For example, with such a configuration, the left-eye measurement unit can be aligned with the left eye, and the right-eye measurement unit can be aligned with the right eye.

[0024] Furthermore, the optometry device of this embodiment has a pair of left and right measuring units, one for the left eye and one for the right eye. This allows the left eye to receive a target light beam from the second light projection optical system of the left eye measuring unit, and the right eye to receive a target light beam from the second light projection optical system of the right eye measuring unit. This enables binocular fusion between the left and right eyes.

[0025] <Shared optical components> The optometry device of this embodiment may include a shared optical member. The shared optical member is an optical member shared between the optical path of the objective measurement optical system and the optical path of the subjective measurement optical system. For example, the shared optical member may guide the measurement light beam from the first projection optical system in the objective measurement optical system to the eye under examination. Alternatively, the shared optical member may guide the target light beam projected from the second projection optical system in the subjective measurement optical system and corrected by the corrective optical system to the eye under examination. This allows the image of the target light beam to be optically presented to the eye under examination at a predetermined examination distance.

[0026] The shared optical member may be an optical member fixedly positioned in the optical path of the first light-emitting optical system in the objective measurement optical system. Alternatively, the shared optical member may be an optical member fixedly positioned in the optical path of the second light-emitting optical system in the subjective measurement optical system. Furthermore, the shared optical member may be shared between the optical paths of the measurement beam and target beam from the left eye measurement unit and the optical paths of the measurement beam and target beam from the right eye measurement unit. For example, at least one of a concave mirror (e.g., concave mirror 85), a lens, etc., may be used as the shared optical member.

[0027] <Alignment tolerance> The ophthalmic apparatus of this embodiment may have a first alignment tolerance range (for example, alignment tolerance range B1). The first alignment tolerance range is a tolerance range for determining the positional misalignment between the eye under examination and the objective measurement optical system. For example, the first alignment tolerance range may be a tolerance range for determining the positional misalignment in the X direction between the eye under examination and the objective measurement optical system. It may also be a tolerance range for determining the positional misalignment in the Y direction between the eye under examination and the objective measurement optical system. It may also be a tolerance range for determining the positional misalignment in the Z direction between the eye under examination and the objective measurement optical system. Of course, it may also be a tolerance range that is a combination of multiple directions.

[0028] Furthermore, the first alignment tolerance range may be a tolerance range for determining the misalignment between the eye under examination and the first light-emitting optical system in the objective measurement optical system. It may also be a tolerance range for determining the misalignment between the eye under examination and the light-receiving optical system in the objective measurement optical system. Of course, it may also be a tolerance range for determining the misalignment between the eye under examination and both the first light-emitting optical system and the light-receiving optical system.

[0029] The ophthalmic apparatus of this embodiment may have a second alignment tolerance range (for example, alignment tolerance range B2). The second alignment tolerance range is a tolerance range for determining the positional misalignment between the eye under examination and the subjective measurement optical system. For example, the second alignment tolerance range may be a tolerance range for determining the positional misalignment in the X direction between the eye under examination and the subjective measurement optical system. It may also be a tolerance range for determining the positional misalignment in the Y direction between the eye under examination and the subjective measurement optical system. It may also be a tolerance range for determining the positional misalignment in the Z direction between the eye under examination and the subjective measurement optical system. Of course, it may also be a tolerance range that is a combination of multiple directions.

[0030] The second alignment tolerance range may be a tolerance range for determining the misalignment between the eye under examination and the subjective measurement optical system so that the target is presented to the eye under examination. For example, it may be a range similar to that of a typical pupil diameter, or a range smaller than that of a typical pupil diameter. This reduces the possibility that at least a portion of the target light beam from the second projection optical system directed at the eye under examination will be obscured, causing the target to appear incomplete to the eye under examination.

[0031] At least one of the first alignment tolerance range and the second alignment tolerance range may be a preset fixed value tolerance range. Alternatively, at least one of the first alignment tolerance range and the second alignment tolerance range may be an arbitrary value tolerance range set based on an operation signal for setting each tolerance range. In this case, for example, the operation signal may be output by the examiner operating an operation means (e.g., switch unit 6b). Alternatively, for example, the operation signal may be output by using an external storage means (e.g., SD card, USB memory, server, cloud, etc.) and reading data stored in the external storage means.

[0032] In this embodiment, the second alignment tolerance range is wider than the first alignment tolerance range. For example, the second alignment tolerance range may be wider than the first alignment tolerance range and within a range similar to (or smaller than) a typical pupil diameter. This allows each measurement to be performed with an alignment tolerance range suitable for objective measurement using an objective measurement optical system and subjective measurement using a subjective measurement optical system, respectively. For example, in objective measurement, the positional misalignment between the eye under examination and the objective measurement optical system is finely adjusted, so accurate measurement results can be obtained. In subjective measurement, a certain degree of positional misalignment between the eye under examination and the subjective measurement optical system is tolerated, which reduces the frequency with which the target appears to move, thus reducing discomfort and fatigue for the subject and allowing for good measurement results. Even if the eye under examination moves significantly and falls outside the second alignment tolerance range, the positional misalignment is adjusted as appropriate, so the target is presented appropriately to the eye under examination.

[0033] <Control means> The optometry apparatus of this embodiment may include a first control means (for example, a control unit 70). The first control means performs a first alignment process based on a first alignment tolerance range for determining the misalignment between the eye under examination and the objective measurement optical system. As the first alignment process, the first control means may perform a process that can eliminate the misalignment between the eye under examination and the objective measurement optical system. For example, the relative positional relationship between the eye under examination and the objective measurement optical system may be adjusted. As an example, the objective measurement optical system may be moved relative to the eye under examination. Alternatively, for example, face support means (for example, at least one of a forehead rest 4, chin rest 5, cheek rest, etc.) that supports at least a part of the subject's face may be operated to position the eye under examination in an appropriate location. Alternatively, for example, guide information may be output to guide the eye under examination to an appropriate location. As an example, a message informing the subject to move their face may be output by controlling a voice generation means, controlling a display means, etc.

[0034] The optometry apparatus of this embodiment may include a second control means (for example, a control unit 70). The second control means performs a second alignment process based on a second alignment tolerance range for determining the misalignment between the eye under examination and the subjective measurement optical system. As the second alignment process, the second control means may perform a process that can eliminate the misalignment between the eye under examination and the subjective measurement optical system. For example, the relative positional relationship between the eye under examination and the subjective measurement optical system may be adjusted. As an example, the subjective measurement optical system may be moved relative to the eye under examination. Also, for example, similar to the first control means, a face support means may be operated to position the eye under examination appropriately, or guide information may be output to guide the eye under examination to an appropriate position.

[0035] In this embodiment, the first control means adjusts the relative positional relationship between the eye under examination and the objective measurement optical system as a first alignment process. For example, the objective measurement optical system may be moved in at least the X and Y directions. Of course, for example, the objective measurement optical system may also be moved in the Z direction. Furthermore, if the objective measurement optical system deviates from the eye under examination beyond the first alignment tolerance range, the first control means may perform tracking control to adjust the objective measurement optical system to the eye under examination.

[0036] Furthermore, in this embodiment, the second control means adjusts the relative positional relationship between the eye under examination and the subjective measurement optical system as a second alignment process. For example, the subjective measurement optical system may be moved in at least the X and Y directions. Of course, for example, the subjective and objective measurement optical systems may be moved in the Z direction. For example, the second control means may perform tracking control to adjust the subjective measurement optical system to the eye under examination if the subjective measurement optical system deviates from the eye under examination by more than the second alignment tolerance range.

[0037] For example, since the eye under examination is prone to shifting in the XY direction, moving the objective and subjective measurement optical systems at least in the XY direction reduces the possibility of not being able to properly present the target to the eye under examination. Furthermore, by moving the objective and subjective measurement optical systems in a three-dimensional direction relative to the eye under examination, the objective and subjective measurement optical systems can be quickly positioned appropriately in response to the eye's shift.

[0038] Furthermore, the first control means and the second control means may be used interchangeably. In other words, a single moving means may be used to perform both alignment processing based on a first alignment tolerance range between the eye under examination and the objective measurement optical system, and alignment processing based on a second alignment tolerance range between the eye under examination and the subjective measurement optical system.

[0039] <Change control means> The optometry apparatus of this embodiment may include a change control means (for example, a control unit 70). The change control means changes a first alignment tolerance range corresponding to objective measurement and a second alignment tolerance range corresponding to subjective measurement when the measurement of the eye under examination switches from one to the other, between objective measurement using an objective measurement optical system and subjective measurement using a subjective measurement optical system. For example, when switching from objective measurement to subjective measurement of the eye under examination, the setting may be changed from the first alignment tolerance range to the second alignment tolerance range. Alternatively, for example, when switching from subjective measurement to objective measurement of the eye under examination, the setting may be changed from the second alignment tolerance range to the first alignment tolerance range. This allows each measurement of the eye under examination to proceed smoothly and measurement results to be obtained with high accuracy.

[0040] The change control means may change the setting from the first alignment tolerance range to the second alignment tolerance range at any point between the start and end of the subjective measurement when switching from objective measurement to subjective measurement of the eye under examination. Alternatively, the change control means may change the setting from the second alignment tolerance range to the first alignment tolerance range at any point between the start and end of the objective measurement when switching from subjective measurement to objective measurement of the eye under examination.

[0041] The change control means may set each tolerance range based on a change signal for changing the first alignment tolerance range and the second alignment tolerance range. For example, a change signal may be output when an examiner operates an operating means. For example, a change signal may be output as a trigger for an operation to start at least one of objective and subjective measurements, an operation to specify at least one of the type of visual target and visual acuity value to be presented to the eye under examination, an operation to specify the corrective power to correct the eye under examination, etc. Alternatively, a change signal may be output based on a program that automatically proceeds with at least one of objective and subjective measurements.

[0042] The change control means may set a second alignment tolerance range when the optical properties of the eye under test are being objectively measured by an objective measurement optical system while the optical properties of the eye under test are being subjectively measured by a subjective measurement optical system. For example, the optical properties of the eye under test may be measured objectively once while the optical properties of the eye under test are being subjectively measured. Alternatively, for example, the optical properties of the eye under test may be measured objectively multiple times while the optical properties of the eye under test are being subjectively measured. As an example, the multiple measurements may occur at any of the following timings: every time a predetermined amount of time has elapsed since the start of subjective measurement, every time the type of target presented to the eye under test is switched, every time the visual acuity value of the target presented to the eye under test is switched, every time the corrective power for correcting the eye under test is switched, etc. Alternatively, for example, the optical properties of the eye under test may be measured objectively continuously (in real time) while the optical properties of the eye under test are being subjectively measured. This allows for the acquisition of good measurement results for both objective and subjective measurements of the eye being examined.

[0043] This disclosure is not limited to the apparatus described in this embodiment. For example, terminal control software (program) that performs the functions of the above embodiment can be supplied to a system or apparatus via a network or various storage media, and the control device (e.g., CPU) of the system or apparatus can read and execute the program.

[0044] <Examples> An embodiment of the eye examination device (hereinafter referred to as the eye examination device) according to this embodiment will be described below.

[0045] Figure 1 is an external view of the optometry device 100. For example, the optometry device 100 comprises a housing 2, a presentation window 3, a forehead rest 4, a chin rest 5, a controller 6, an imaging unit 90, etc. The housing 2 contains a measurement unit 7, a deflection mirror 81, a reflective mirror 84, a concave mirror 85, etc. The presentation window 3 is used to present a visual target to the eye being examined E. The forehead rest 4 and chin rest 5 are used to maintain a constant distance between the eye being examined E and the optometry device 1. The controller 6 includes a monitor 6a, a switch unit 6b, etc. The monitor 6a displays various information (e.g., measurement results of the eye being examined, etc.). The monitor 6a may also be a touch panel that also functions as the switch unit 6b. The switch unit 6b is used to perform various settings (e.g., input of a start signal, etc.). Signals corresponding to operation instructions from the controller 6 are output to the control unit 70 via wired or wireless communication.

[0046] The imaging unit 90 is used to photograph the subject's face and adjust the position of the subject's eye in the Y direction. The imaging unit 90 includes an imaging optical system (not shown). For example, the imaging optical system may consist of an image sensor and a lens.

[0047] <Measurement part>

[0048] The measurement unit 7 comprises a left eye measurement unit 7L and a right eye measurement unit 7R. The left eye measurement unit 7L and the right eye measurement unit 7R are made of the same material. Of course, the left eye measurement unit 7L and the right eye measurement unit 7R may be made of different materials in at least part of their components. The measurement unit 7 has a pair of subjective measurement units and a pair of objective measurement units (details will be described later). The target light beam and measurement light beam from the measurement unit 7 are guided to the eye E under examination via the presentation window 3.

[0049] Figure 2 shows the left eye measurement unit 7L. The right eye measurement unit 7R has the same configuration as the left eye measurement unit 7L and is therefore omitted. For example, the left eye measurement unit 7L includes an objective measurement optical system 10, a subjective measurement optical system 25, a first index projection optical system 45, a second index projection optical system 46, an observation optical system 50, etc.

[0050] <Objective measurement optical system> The objective measurement optical system 10 is used as part of the configuration of the objective measurement unit that objectively measures the optical properties of the eye under examination. In this embodiment, the refractive power of the eye under examination E is measured as an optical property of the eye under examination E. For example, the objective measurement optical system 10 is composed of a projection optical system 10a and a light-receiving optical system 10b.

[0051] The projection optical system 10a projects a spot-shaped measurement target onto the fundus of the eye under examination E through the center of the pupil of the eye under examination E. For example, the projection optical system 10a includes a light source 11, a relay lens 12, a hole mirror 13, a prism 15, an objective lens 93, a dichroic mirror 35, a dichroic mirror 29, etc. The light source 11 emits a measurement light beam. The light source 11 is conjugate to the fundus of the eye under examination E. The hole portion of the hole mirror 13 is conjugate to the pupil of the eye under examination E. The prism 15 is a light beam deflection member. The prism 15 is positioned away from the position conjugate to the pupil of the eye under examination E, and eccentricates the measurement light beam passing through the prism 15 with respect to the optical axis L1. The prism 15 is rotationally driven by a drive unit (motor) 23 around the optical axis L1. The dichroic mirror 35 makes the optical path of the objective measurement optical system 10 and the optical path of the subjective measurement optical system 25 a common optical path. In other words, it makes the optical axis L1 of the objective measurement optical system 10 and the optical axis L2 of the subjective measurement optical system 25 coaxial. The dichroic mirror 29 is an optical path branching member. The dichroic mirror 29 reflects the measurement light beam from the projection optical system 10a and the target light beam from the projection optical system 30 (described later) and guides them to the eye E under examination.

[0052] The light-receiving optical system 10b extracts the retinal reflected light beam reflected from the fundus of the eye under examination E in a ring shape via the area around the pupil of the eye under examination E. For example, the light-receiving optical system 10b includes a dichroic mirror 29, a dichroic mirror 35, an objective lens 93, a prism 15, a hall mirror 13, a relay lens 16, a mirror 17, a light-receiving aperture 18, a collimator lens 19, a ring lens 20, an image sensor 22, etc. The ring lens 20 consists of a ring-shaped lens portion and a light-shielding portion in which a light-shielding coating is applied to the area other than the lens portion. The ring lens 20 is in an optically conjugate positional relationship with the pupil of the eye under examination E. The light-receiving aperture 18 and the image sensor 22 are in a conjugate relationship with the fundus of the eye under examination E. The output from the image sensor 22 is input to the control unit 70.

[0053] In this embodiment, the prism 15 is positioned on the common optical axis of the projection optical system 10a and the light-receiving optical system 10b. For example, the measurement light beam from the projection optical system 10a passes through the prism 15 and enters the eye E under examination, and the fundus-reflected light beam reflected from the fundus of the eye E under examination also passes through the same prism 15. Therefore, subsequent optical systems are scanned in reverse as if there were no eccentricity of the projected light beam and fundus-reflected light beam (receiving light beam) above the pupil.

[0054] <Subjective measurement optical system> The subjective measurement optical system 25 is used as part of the configuration of a subjective measurement unit that subjectively measures the optical properties of the eye E under examination. In this embodiment, the refractive power of the eye E under examination is measured as an optical property of the eye E under examination. For example, the subjective measurement optical system 25 is composed of a light projection optical system 30 and a corrective optical system 60.

[0055] <Floodlight Optics> The projection optical system 30 projects a target light beam toward the eye E under examination. For example, the projection optical system 30 includes a display 31, projection lenses 33 and 34, a reflective mirror 36, an objective lens 92, a dichroic mirror 35, a dichroic mirror 29, etc. The display 31 shows the target (fixation target, test target, etc.).

[0056] <Correction optical system> The corrective optical system 60 is positioned within the optical path of the projection optical system 30. The corrective optical system 60 also alters the optical properties of the target light beam emitted from the display 31. For example, the corrective optical system 60 includes an astigmatism correction optical system 63, a drive mechanism 39, etc. The astigmatism correction optical system 63 is used to correct the cylindrical power and astigmatism axis angle of the eye E under examination. The astigmatism correction optical system 63 is positioned between the projection lens 33 and the projection lens 34. The astigmatism correction optical system 63 consists of two positive cylindrical lenses 61a and 61b with equal focal lengths. The cylindrical lenses 61a and 61b rotate independently around the optical axis L2 by the drive of the rotation mechanism 62a and 62b.

[0057] In this embodiment, the astigmatism correction optical system 63 was described using a configuration with cylindrical lenses 61a and 61b as an example, but it is not limited to this. The astigmatism correction optical system 63 can be configured to correct cylindrical power, astigmatism axis angle, etc. For example, the corrective lenses may be inserted into and removed from the optical path of the light projection optical system 30.

[0058] The light source 11 and relay lens 12 of the projection optical system 10a, the light receiving aperture 18, collimator lens 19, ring lens 20, and image sensor 22 of the light receiving optical system 10b, and the display 31 of the light projection optical system 30 are all movable integrally in the optical axis direction by a drive mechanism 39. In other words, the display 31, light source 11, relay lens 12, light receiving aperture 18, collimator lens 19, ring lens 20, and image sensor 22 synchronize as a drive unit 95, and are moved integrally by the drive mechanism 39. The drive mechanism 39 consists of a motor and a sliding mechanism.

[0059] The drive mechanism 39 moves the drive unit 95 in the direction of the optical axis, thereby moving the display 31 in the direction of the optical axis L2. This allows for the application of a cloud effect to the eye E being examined in objective measurements. In subjective measurements, the presentation distance of the target to the eye E being examined can be optically changed to correct the spherical power of the eye E being examined. In other words, the configuration that moves the display 31 in the direction of the optical axis L2 is used as a spherical correction optical system that corrects the spherical power of the eye E being examined, and the spherical power of the eye E being examined is corrected by changing the position of the display 31. Note that the configuration of the spherical correction optical system may differ from that of this embodiment. For example, the spherical power may be corrected by arranging a number of optical elements in the optical path. Alternatively, for example, the spherical power may be corrected by arranging a lens in the optical path and moving the lens in the direction of the optical axis.

[0060] Furthermore, the drive mechanism 39 moves the drive unit 95 in the direction of the optical axis, thereby moving the light source 11, the relay lens 12, and the image sensor 22 from the light-receiving aperture 18 in the direction of the optical axis L1. This positions the light source 11, the light-receiving aperture 18, and the image sensor 22 so that they are optically conjugate with respect to the fundus of the eye E being examined. Regardless of the movement of the drive unit 95, the hall mirror 13 and the ring lens 20 are positioned so that they are conjugate with the pupil of the eye E being examined at a constant magnification. As a result, the fundus reflected light beam, which is the measurement light beam from the projection optical system 10a reflected, always enters the ring lens 20 of the light-receiving optical system 10b as a parallel light beam, and regardless of the refractive power of the eye E being examined, a ring-shaped light beam of the same size as the ring lens 20 is captured in focus on the image sensor 22.

[0061] <First Indicator Projection Optical System and Second Indicator Projection Optical System> The first index projection optical system 45 and the second index projection optical system 46 are positioned between the dichroic mirror 29 and the deflection mirror 81 (described later). The first index projection optical system 45 emits near-infrared light to project an alignment index at infinity onto the cornea of ​​the eye E under examination. The second index projection optical system 46 is positioned differently from the first index projection optical system 45 and emits near-infrared light to project a finite-distance alignment index onto the cornea of ​​the eye under examination. The near-infrared light (alignment light) emitted from the second index projection optical system 46 is also used as anterior segment imaging light to photograph the anterior segment of the eye under examination by the observation optical system 50.

[0062] <Observation Optical System> The observation optical system (imaging optical system) 50 includes a dichroic mirror 29, an objective lens 103, an imaging lens 51, an image sensor 52, etc. The dichroic mirror 29 transmits anterior segment observation light and alignment light. The image sensor 52 has an imaging surface positioned conjugate to the anterior segment of the eye under examination E. The output from the image sensor 52 is input to the control unit 70. As a result, an anterior segment image of the eye under examination E is captured by the image sensor 52 and displayed on the monitor 6a. This observation optical system 50 also serves as an optical system for detecting the alignment index image formed on the cornea of ​​the eye under examination E by the first index projection optical system 45 and the second index projection optical system 46, and the position of the alignment index image is detected by the control unit 70.

[0063] <Internal Configuration of the Ophthalmic Device> The internal configuration of the optometric device 100 will now be described. Figure 3 is a schematic diagram of the inside of the optometric device 100 viewed from the front. Figure 4 is a schematic diagram of the inside of the optometric device 100 viewed from the side. Figure 5 is a schematic diagram of the inside of the optometric device 100 viewed from above. Note that in Figures 4 and 5, for the sake of explanation, only the optical axis of the left eye measuring unit 7L is shown.

[0064] The optometry device 100 includes an objective measurement unit. For example, the objective measurement unit consists of a measurement unit 7, a deflection mirror 81, a reflection mirror 84, a concave mirror 85, etc. The optometry device 100 also includes a subjective measurement unit. For example, the subjective measurement unit consists of a measurement unit 7, a deflection mirror 81, a reflection mirror 84, a concave mirror 85, etc. Note that the objective and subjective measurement units are not limited to these configurations. For example, a configuration without a reflection mirror 84 may be used. In this case, the light beam from the measurement unit 7 may be irradiated from an oblique direction to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. Alternatively, for example, a configuration with a half mirror may be used. In this case, the light beam from the measurement unit 7 may be irradiated from an oblique direction to the optical axis L of the concave mirror 85 via the half mirror.

[0065] For example, the deflection mirror 81 has a left-eye deflection mirror 81L and a right-eye deflection mirror 81R, which are provided as a pair on the left and right sides, respectively. For example, the deflection mirror 81 is positioned between the corrective optical system 60 and the eye under examination E. That is, the corrective optical system 60 in this embodiment has a left-eye corrective optical system and a right-eye corrective optical system, which are provided as a pair on the left and right sides, with the left-eye deflection mirror 81L positioned between the left-eye corrective optical system and the left eye EL, and the right-eye deflection mirror 81R positioned between the right-eye corrective optical system and the right eye ER. For example, it is preferable that the deflection mirror 81 be positioned at the pupil conjugate position.

[0066] For example, the left eye deflection mirror 81L reflects the light beam projected from the left eye measuring unit 7L and guides it to the left eye EL. Also, for example, the left eye deflection mirror 81L reflects the fundus-reflected light beam from the left eye EL and guides it to the left eye measuring unit 7L. For example, the right eye deflection mirror 81R reflects the light beam projected from the right eye measuring unit 7R and guides it to the right eye ER. Also, for example, the right eye deflection mirror 81R reflects the fundus-reflected light beam from the right eye ER and guides it to the right eye measuring unit 7R.

[0067] For example, the deflection mirror 81 is rotated by the drive unit 82. For example, by rotating the deflection mirror 81, the apparent light beam that forms an image of the target light beam in front of the eye under examination can be deflected, and the position in which the image of the target light beam is formed can be optically corrected. For example, the drive unit 82 consists of a motor or the like. For example, the drive unit 82 rotates the deflection mirror 81 with respect to a rotation axis in the horizontal direction (X direction) and a rotation axis in the vertical direction (Y direction). That is, the drive unit 82 rotates the deflection mirror 81 in the XY direction. Note that the rotation of the deflection mirror 81 may be in either the horizontal or vertical direction. For example, the drive unit 82 has a drive unit 82L for driving the left eye deflection mirror 81L and a drive unit 82R for driving the right eye deflection mirror 81R.

[0068] In this embodiment, a configuration using a deflection mirror 81 as a deflection member that reflects and guides the light beam projected from the measuring unit 7 onto the eye E under examination is described as an example, but the invention is not limited to this. The deflection member only needs to be able to reflect and guide the light beam projected from the measuring unit 7 onto the eye E under examination, and may be a prism, lens, etc.

[0069] Furthermore, for example, multiple deflection mirrors 81 may be provided in each of the left eye optical path and the right eye optical path. For example, one configuration may be provided with two deflection mirrors in each of the left eye optical path and the right eye optical path (for example, a configuration in which two deflection mirrors are provided in the left eye optical path, etc.). In this case, one deflection mirror may be rotated in the X direction and the other deflection mirror may be rotated in the Y direction. For example, by rotating the deflection mirror 81, the apparent light beam for forming the image of the target light beam in front of the eye under examination can be deflected, and the formation position of the image of the target light beam can be optically corrected.

[0070] For example, the concave mirror 85 guides the target light beam that has passed through the corrective optical system 60 to the eye E under examination, forming an image of the target light beam that has passed through the corrective optical system 60 in front of the eye of the eye under examination E. For example, the concave mirror 85 is shared between the left eye measuring unit 7L and the right eye measuring unit 7R. For example, the concave mirror 85 is shared between the left eye optical path including the left eye corrective optical system and the right eye optical path including the right eye corrective optical system. That is, the concave mirror 85 is positioned where both the left eye optical path including the left eye corrective optical system and the right eye optical path including the right eye corrective optical system pass through. Of course, the concave mirror 85 does not have to be shared between the left eye optical path and the right eye optical path. That is, a concave mirror may be provided in each of the left eye optical path including the left eye corrective optical system and the right eye optical path including the right eye corrective optical system. For example, the concave mirror 85 guides the target light beam that has passed through the corrective optical system 60 to the eye E under examination, forming an image of the target light beam that has passed through the corrective optical system 60 in front of the eye of the eye under examination E.

[0071] The deflection mirrors 81 are driven by a drive unit 83 (for example, a motor). For example, the drive unit 83 includes a left drive unit 83L for driving the left eye deflection mirror 81L and a right drive unit 83R for driving the right eye deflection mirror 81R. Driven by the drive unit 83, each deflection mirror moves in the X direction. For example, by moving the left eye deflection mirror 81L and the right eye deflection mirror 81R, the distance between the left eye deflection mirror 81L and the right eye deflection mirror 81R is changed, and the distance in the X direction between the left eye optical path and the right eye optical path can be changed to match the interpupillary distance of the eye E under examination.

[0072] Furthermore, the measuring unit 7 is driven by a drive unit 9 (for example, a motor). For example, the drive unit 9 has a left drive unit 9L for driving the left eye measuring unit 7L and a right drive unit 9R for driving the right eye measuring unit 7R. Driven by the drive unit 9, each measuring unit moves in the X direction. For example, as the left eye measuring unit 7L and the right eye measuring unit 7R move, the distance between each measuring unit and the deflection mirror 81 changes, and the presentation position of the target light beam from each measuring unit in the Z direction is changed. This allows the measuring unit 7 to be adjusted in the Z direction so that the target light beam corrected by the corrective optical system 60 is guided to the eye E under examination, and an image of the target light beam corrected by the corrective optical system 60 is formed on the fundus of the eye E under examination.

[0073] <Optical paths of the objective and subjective measurement units> The optical path of the objective measurement unit will be explained using the left eye optical path as an example. The right eye optical path has the same configuration as the left eye optical path. The measurement light beam emitted from the light source 11 of the projection optical system 10a reaches the left eye EL via each optical component. For example, the measurement light beam is guided from the left eye measurement unit 7L to the left eye deflection mirror 81L by sequentially passing through the optical components from the relay lens 12 to the dichroic mirror 29. Furthermore, the target light beam is reflected by the left eye deflection mirror 81L and guided to the left eye EL via the reflection mirror 84 and the concave mirror 85. A spot-shaped point light source image is formed on the fundus of the left eye EL. At this time, the pupil projection image of the hole portion of the hole mirror 13 (projected light beam on the pupil) is rapidly eccentrically rotated by the prism 15 rotating around the optical axis.

[0074] In the fundus of the eye E under examination, the measurement light beam is reflected and emitted, and guided to the left eye measurement unit 7L via the concave mirror 85, the reflective mirror 84, and the deflection mirror 81. Furthermore, it is reflected by the dichroic mirror 29 and the dichroic mirror 35, focused by the objective lens 93, and then focused again at the aperture of the light-receiving diaphragm 18 via the rapidly rotating prism 15 and the optical elements from the hole mirror 13 to the mirror 17. The collimator lens 19 and the ring lens 20 then form a ring-shaped image on the image sensor 22. By analyzing the ring-shaped image captured by the image sensor 22, the optical characteristics of the eye E under examination can be objectively measured.

[0075] The optical path of the subjective measurement unit will be explained using the left eye optical path as an example. The right eye optical path has the same configuration as the left eye optical path. The target light beam emitted from the display 31 of the subjective measurement optical system 25 reaches the left eye EL via each optical component. For example, the target light beam is guided from the left eye measurement unit 7L to the left eye deflection mirror 81L by sequentially passing through the optical components from the projection lens 33 to the dichroic mirror 29. Furthermore, the target light beam is reflected by the left eye deflection mirror 81L and guided to the left eye EL via the reflection mirror 84 and the concave mirror 85.

[0076] As a result, an image of the target light beam corrected by the corrective optical system 60 is formed on the fundus of the left eye EL, using the position of the left eye EL wearing glasses (for example, about 12 mm from the corneal apex) as a reference. Therefore, the adjustment of the spherical power by the corrective optical system (in this embodiment, the driving of the driving mechanism 39) is performed in front of the eye, and this is equivalent to the astigmatism correcting optical system 63 being positioned in front of the eye. The subject can sight the image of the target light beam formed optically in front of the eye at a predetermined examination distance via the concave mirror 85 in a natural state.

[0077] <Department Head> Figure 6 shows the control system of the optometry device 100. The control unit 70 includes a CPU (processor), RAM, ROM, etc. For example, the CPU is responsible for controlling each component of the optometry device 100. For example, RAM temporarily stores various types of information. For example, ROM stores various programs for controlling the operation of the optometry device 100, visual targets, initial values, etc. Note that the control unit 70 may be composed of multiple control units (i.e., multiple processors).

[0078] For example, the control unit 70 is electrically connected to various components such as the monitor 6a, light source 11, image sensor 22, display 31, image sensor 52, and non-volatile memory 75 (hereinafter referred to as memory 75). In addition, the control unit 70 is electrically connected to components such as the drive unit 9, drive unit 82, drive unit 83, and drive mechanism 39. For example, memory 75 is a non-transient storage medium that can retain its contents even when the power supply is interrupted. For example, a hard disk drive, flash ROM, USB memory, etc., can be used as memory 75.

[0079] <Control operation> The control operation of the optometry device 100 will be described below.

[0080] The examiner instructs the subject to place their face against the forehead rest 4 and chin rest 5 and observe the presentation window 3. The examiner also operates the switch unit 6b to start measuring the subject eye E. Based on the operation signal from the switch unit 6b, the control unit 70 performs initial alignment on the subject eye E and then automatically proceeds with objective and subjective measurements.

[0081] <Initial alignment of the eye being examined> In response to an operation signal to start measuring the eye E under examination, the control unit 70 displays a fixation target for the left eye on the display 31 of the left eye measurement unit 7L. It also displays a fixation target for the right eye on the display 31 of the right eye measurement unit 7R. As a result, the left and right eyes are in a state of binocular fusion of the fixation targets.

[0082] The control unit 70 projects an alignment index image onto the cornea of ​​the left eye using the first index projection optical system 45 and the second index projection optical system 46 of the left eye measuring unit 7L. The control unit 70 also detects the X, Y, and Z displacement of the left eye measuring unit 7L relative to the left eye based on the alignment index image and moves the left eye measuring unit 7L. Similarly, the control unit 70 projects an alignment index image onto the cornea of ​​the right eye and moves the right eye measuring unit 7R based on the alignment index image.

[0083] Figure 7 shows an example of an anterior segment image 300 of the left eye. For example, the central position of the anterior segment image 300, which coincides with the optical axis L4L, is set as the alignment reference position N. Also, for example, a predetermined XY range based on the alignment reference position N is set as the alignment tolerance range A1 for determining whether the alignment in the XY direction is appropriate. Also, for example, a predetermined Z range based on the alignment reference position N is set as an alignment tolerance range (not shown) for determining whether the alignment in the Z direction is appropriate.

[0084] The control unit 70 detects the XY center coordinates of the alignment index image as the corneal vertex position K, and determines the deviation amount Δd between the corneal vertex position K and the alignment reference position N to detect whether the corneal vertex position K is deviated from the alignment reference position N. The control unit 70 also moves the left eye measuring unit 7L in the X and Y directions so that the deviation amount Δd falls within the alignment tolerance range A1. The control unit 70 also moves the left eye measuring unit 7L in the Z direction so that the image ratio between the image interval of the alignment index image at infinity and the image interval of the alignment index image at finite distance falls within the alignment tolerance range (not shown). When the deviation amount Δd and the image ratio fall within the tolerance range, the movement of the left eye measuring unit 7L is stopped.

[0085] For example, the alignment of the right eye and the right eye measuring unit 7R, as well as the alignment of the left eye and the left eye measuring unit 7L, is performed by similar control based on the alignment tolerance range.

[0086] <Objective measurement> Once the initial alignment of the left eye and the left eye measurement unit 7L, and the initial alignment of the right eye and the right eye measurement unit 7R are completed, the control unit 70 automatically starts objective measurements for the left and right eyes. For example, fixation targets are continuously presented to the left and right eyes, and objective measurements for the left and right eyes are performed in parallel while the fixation targets are fused binocularly.

[0087] At this time, the control unit 70 sets an objective alignment tolerance range B1 based on the alignment reference position N, and tracks the left eye measurement unit 7L and the right eye measurement unit 7R based on this alignment tolerance range B1 (i.e., performs tracking control). Note that the objective alignment tolerance range B1 may be the same tolerance range as the aforementioned alignment tolerance range A1. In this case, tracking control based on the alignment tolerance range A1 is performed continuously from the initial alignment.

[0088] Figure 8 illustrates the alignment tolerance range B1 for objective measurement. In objective measurement, it is necessary to align the eye being measured with each measurement point more precisely. For example, if the subject's face or the gaze of the eye being measured moves and the predetermined positional relationship between the eye being measured and each measurement point is disrupted, the size and shape of the ring image will change, making it impossible to obtain appropriate measurement results. In particular, if each measurement point is significantly misaligned with respect to the eye being measured, the effect on the ring image will be large, and the measurement result will be calculated as a value different from the actual refractive power. For this reason, the alignment tolerance range B1 for objective measurement is set as a narrower tolerance range than the alignment tolerance range B2 (described later) for subjective measurement. As an example, it may be set within a range of φ0.5 mm from the alignment reference position N. Of course, it may also be a range different from φ0.5 mm.

[0089] In objective measurements, a preliminary measurement may be performed first, followed by the main measurement. In the preliminary measurement of the left eye, the refractive power is measured with the fixation target positioned at a predetermined presentation distance. For example, the control unit 70 positions the display 31 of the left eye measurement unit 7L at an initial position that is optically far enough from the left eye and corresponds to the far point of the 0D eye. The left eye is also illuminated with a measurement beam from the light source 11 of the projection optical system 10a, and the ring image captured by the image sensor 22 of the light receiving optical system 10b is analyzed. For example, the control unit 70 thins the ring image to determine the refractive power in each meridian direction, performs a predetermined process on this refractive power, and obtains at least the spherical power (spherical power in the preliminary measurement).

[0090] Next, a cloud effect is applied to the left eye. For example, the control unit 70 positions the display 31 of the left eye measurement unit 7L at the cloud effect start position where the left eye can focus, according to the spherical power measured in the preliminary measurement of the left eye. The left eye can then clearly observe the fixation target. Subsequently, the control unit 70 moves the fixation target away from the cloud effect start position. The left eye's focus is no longer on the fixation target, and a cloud effect is applied. This releases the accommodation of the left eye, and the refractive power approaches its true value.

[0091] In the main measurement of the eye under examination E, the refractive power of the eye is measured with a cloud-like effect applied to the left eye. For example, the control unit 70 causes the image sensor 22 to continuously capture ring images at predetermined intervals. In addition, for example, the control unit 70 reduces noise light by summing the ring images and, in the same manner as in the preliminary measurement, acquires the refractive power of the left eye (spherical power, cylindrical power, and astigmatism axis angle in the main measurement) and stores it in the memory 75.

[0092] For example, the objective refractive power measurement of the right eye is performed using the same control method as the objective refractive power measurement of the left eye.

[0093] During the preliminary and main measurements for the left and right eyes, tracking control based on the objective measurement alignment tolerance range B1 is performed for each of the left and right eyes. The control unit 70 continuously detects from the anterior segment image 300 whether the deviation amount Δd between the corneal apex position K and the alignment reference position N of the left eye is within the alignment tolerance range B1. The control unit 70 also restarts alignment and moves the left eye measurement unit 7L if the deviation amount Δd falls outside the alignment tolerance range B1. When the deviation amount Δd enters the alignment tolerance range B1, the movement of the left eye measurement unit 7L is stopped. For the right eye, the movement and stopping of the right eye measurement unit 7R are also performed continuously based on the deviation amount Δd.

[0094] Furthermore, as the tracking control of the control unit 70 adjusts the presentation position of the fixation target for the left and right eyes, the fixation target may appear to move to the subject. However, because the time from the start of objective measurement to obtaining the measurement result is short, the movement of the fixation target is not easily perceived. Therefore, in objective measurement, even if the alignment tolerance range B1 is set narrowly, the subject is less likely to feel annoyance or fatigue due to the movement of the fixation target, and an appropriate objective refractive power (objective value) can be obtained. <Self-perceived measurement> When the control unit 70 acquires objective refractive power measurements for the left and right eyes, it automatically starts subjective measurements for the left and right eyes. For example, subjective measurements for the left eye and then for the right eye are performed sequentially.

[0095] The control unit 70 turns off the display 31 of each measurement unit and stops the presentation of the fixation target. The control unit 70 also sets the spherical power, cylindrical power, and astigmatism axis angle based on the objective refractive power of the left eye. For example, the spherical power of the left eye may be corrected by moving the display 31 in the direction of the optical axis L2. Alternatively, at least one of the cylindrical power and astigmatism axis angle of the left eye may be corrected by rotating the cylindrical lenses 61a and 61b around the axis of the optical axis L2. This corrects the left eye to a predetermined diopter value (e.g., 0D). Similarly, the control unit 70 corrects the right eye to a predetermined diopter value (e.g., 0D) based on the objective refractive power of the right eye.

[0096] Next, the control unit 70 displays a predetermined test target and background image on the display 31 of the left eye measurement unit 7L, and also displays the background image on the display 31 of the right eye measurement unit 7R. For example, the background image may be a white image. Of course, it may also be an image other than white. This makes it possible to create a state of binocular vision without obstructing the view in front of the left and right eyes, while presenting the test target only to the left eye.

[0097] Furthermore, after presenting the test target or background image to the eye E under examination, the control unit 70 detects whether the deviation amount Δd between the corneal apex position K of the left and right eyes and the alignment reference position N falls within the objective measurement alignment tolerance range B1. If the deviation amount Δd is outside the alignment tolerance range B1, the alignment is restarted and the left eye measurement unit 7L and the right eye measurement unit 7R are moved. When the deviation amount Δd falls within the alignment tolerance range B1, the movement of the left eye measurement unit 7L and the right eye measurement unit 7R is stopped.

[0098] Furthermore, subjective measurement of the eye under test E involves switching the test target to the eye under test E and changing the presentation distance of the test target. As a result, the time from the start of subjective measurement to obtaining the measurement result is longer than with objective measurement, and the frequency of movement of the subject's face and the gaze of the eye under test E increases. If subjective measurement is performed while the alignment tolerance range B1 for objective measurement remains set, the subject may be more sensitive to the movement of the test target, and due to annoyance and fatigue, it may not be possible to obtain appropriate measurement results. Therefore, the control unit 70 first finely aligns the eye under test with each measurement unit based on the alignment tolerance range B1 for objective measurement, and then changes the setting to the alignment tolerance range B2 for subjective measurement. Based on the alignment tolerance range B2 for subjective measurement, the left eye measurement unit 7L and the right eye measurement unit 7R are tracked, and the subjective refractive power of the left and right eyes is acquired.

[0099] Figure 9 illustrates the acceptable alignment range B2 for subjective measurement. In subjective measurement of the eye E under test, the measurement can proceed as long as each measuring part is aligned to the extent that the eye E under test can recognize the test target. More specifically, even if the subject's face or the gaze of the eye E under test moves and the predetermined positional relationship between the eye E under test and the measuring part 7 is disrupted, the misalignment of each measuring part is acceptable as long as no part of the test target is missing. For this reason, the acceptable alignment range B2 for subjective measurement is set to be wider than the acceptable alignment range B1 for objective measurement. As an example, an acceptable range within φ2.0 mm to φ4.0 mm may be set based on the alignment reference position N. Of course, an acceptable range smaller than φ2.0 mm or larger than φ4.0 mm may also be acceptable.

[0100] The examiner operates the switch unit 6b to switch the visual acuity values ​​of the test target presented to the left eye, and confirms whether the corrective power for correcting the left eye is appropriate. For example, the examiner asks the subject about the orientation of the test target, and if the subject answers correctly, the visual acuity value is switched to one level higher (i.e., a smaller value); if the subject answers incorrectly, the visual acuity value is switched to one level lower (i.e., a larger value). The control unit 70 changes the test target displayed on the display 31 based on the change signal from the switch unit 6b. If the corrective power for correcting the left eye EL is inappropriate, the corrective power is changed. This allows the subjective refractive power (subjective value) of the left eye to be obtained.

[0101] For example, similar to measuring the subjective refractive power of the left eye, the subjective refractive power (subjective value) of the right eye can be obtained by presenting the test target only to the right eye while using binocular vision with both the left and right eyes, and checking whether the corrective power is appropriate while switching the visual acuity value of the test target presented to the right eye.

[0102] During subjective measurement of the left or right eye, tracking control is performed for each eye based on the subjective measurement alignment tolerance range B2. The control unit 70 continuously detects from the anterior segment image 300 whether the deviation amount Δd between the corneal vertex position K of the left eye and the alignment reference position N is within the alignment tolerance range B2. The control unit 70 also restarts alignment and moves the left eye measurement unit 7L and the right eye measurement unit 7R if the deviation amount Δd falls outside the alignment tolerance range B2 due to movement of the gaze of the eye being examined E, etc. When the deviation amount Δd falls within the alignment tolerance range B2, the movement of the left eye measurement unit 7L is stopped. For the right eye, the movement and stopping of the right eye measurement unit 7R are also performed continuously based on the deviation amount Δd.

[0103] As the tracking control of the control unit 70 adjusts the presentation position of the test targets for the left and right eyes, the test targets may appear to move to the subject. However, by setting a wide alignment tolerance range B2 for subjective measurement, the left and right eyes are less likely to deviate from the alignment tolerance range B2, and the number of times tracking control is performed is reduced. Therefore, even with subjective measurement, the subject is less likely to feel annoyed or fatigued by the movement of the test targets, and appropriate measurement results can be obtained.

[0104] <Measurement of binocular vision function based on binocular fusion state> In subjective measurements of the eye E under examination, it is also possible to measure binocular vision function by creating a state of binocular vision without obstructing the view in front of the left and right eyes, and by fusion of the left and right eyes. For example, the binocular vision function of the eye E under examination may be at least one of the following: binocular balance, stereopsis, phoria, aniseikonia, etc. Based on the operation signal from the switch unit 6b, the control unit 70 displays the background image and a predetermined test target on the display 31 of the left eye measurement unit 7L and the display 31 of the right eye measurement unit 7R, respectively. In other words, the same background image and the same test target are presented to the left and right eyes.

[0105] Thus, even when binocular fusion is performed on the left and right eyes during subjective measurement of the eye E, tracking control based on the subjective measurement alignment tolerance range B2 is performed on both the left and right eyes. For example, if the presentation position of the test target for the left and right eyes is finely adjusted, the subject may feel annoyed or fatigued due to the test target appearing to move, and there is a possibility that binocular fusion will be released, causing the test target to appear separated. By setting the subjective measurement alignment tolerance range B2 to a wide tolerance range, the release of the fusion state due to binocular vision can be suppressed, making it more difficult to separate the test target.

[0106] <Objective measurement during subjective measurement> Furthermore, subjective measurements of eye E can be performed in parallel with objective measurements of eye E. In other words, the refractive power of eye E can be measured objectively while subjective measurements are being taken. For example, accommodation information for eye E can be obtained from the change between the refractive power (first refractive power) obtained by objective measurement of eye E and the refractive power (second refractive power) obtained by objective measurement during subjective measurement of eye E. Note that accommodation information for eye E may also be information about the accommodative function of eye E. For example, it may be information such as whether or not the eye is accommodating, and how the accommodative state has changed.

[0107] Thus, when objective and subjective measurements of the eye E under examination are performed in parallel, the alignment tolerance range B2 for subjective measurement is set. In other words, when both objective and subjective measurements are performed, the alignment tolerance range B2 for subjective measurement takes precedence. For example, if an alignment tolerance range B1 for objective measurement is set for the objective measurement optical system, it will become impossible to acquire the refractive power of the second eye if the deviation amount Δd exceeds the alignment tolerance range B1 but remains within the alignment tolerance range B2. By setting the alignment tolerance ranges for objective and subjective measurements to the same tolerance range, the refractive power of the second eye can be acquired smoothly.

[0108] For example, the control unit 70 detects whether the deviation amount Δd is within the alignment tolerance range B2, and moves the left eye measuring unit 7L and the right eye measuring unit 7R so that the deviation amount Δd falls within the alignment tolerance range B2. The control unit 70 also acquires the refractive power of the second eye at at least one of the following timings between the start and end of the subjective measurement (for example, the timing of the start of the subjective measurement, the timing of switching the test target, the timing of switching the correction power, etc.). For example, accommodation information may be acquired by calculating the difference between the refractive power of the first eye and the refractive power of the second eye.

[0109] As explained above, for example, the optometry device of this embodiment performs a first alignment process based on a first alignment tolerance range to determine the misalignment between the eye under examination and the objective measurement optical system, and a second alignment process based on a second alignment tolerance range to determine the misalignment between the eye under examination and the subjective measurement optical system, with the second alignment tolerance range being wider than the first alignment tolerance range. For example, in objective measurement, the misalignment between the eye under examination and the objective measurement optical system is finely adjusted based on the first alignment tolerance range, so that measurement results can be obtained with high accuracy. Also, for example, in subjective measurement, the misalignment between the eye under examination and the subjective measurement optical system is tolerated to a certain extent based on the second alignment tolerance range, so that the frequency of the visual target appearing to move is reduced, and that measurement results can be obtained well.

[0110] Furthermore, for example, the optometry device of this embodiment adjusts the relative positional relationship between the eye under examination and the objective measurement optical system as a first alignment process, and adjusts the relative positional relationship between the eye under examination and the subjective measurement optical system as a second alignment process. This allows each optical system to be quickly positioned appropriately in response to any misalignment between the eye under examination and the objective measurement optical system and the subjective measurement optical system.

[0111] Furthermore, for example, in this embodiment, when the measurement of the eye under examination switches from objective measurement using an objective measurement optical system to subjective measurement using a subjective measurement optical system, the first alignment tolerance range corresponding to objective measurement and the second alignment tolerance range corresponding to subjective measurement are changed. This allows each measurement to proceed smoothly in the series of objective and subjective measurements of the eye under examination. For example, in objective measurement, the measurement proceeds smoothly by moving the objective optical system with high precision. For example, in subjective measurement, the patient does not feel the annoyance or fatigue caused by the moving appearance of the test target, and the measurement proceeds smoothly.

[0112] Furthermore, for example, in this embodiment, the optometry device sets a second alignment tolerance range for subjective measurement when objectively measuring the optical properties of the eye being examined while subjective measurement of the optical properties of the eye being examined is being performed. For example, in such a configuration, if a first alignment tolerance range for objective measurement is set (in other words, the first alignment tolerance range is prioritized), problems such as inconvenience caused by the movement of the examination target cannot be solved. Also, for example, in such a configuration, if the alignment tolerance ranges for objective measurement and subjective measurement are different tolerance ranges, there is a possibility that the measurement result of the objective measurement will not be obtained when the measurement falls outside the first alignment tolerance range for objective measurement but falls within the second alignment tolerance range for subjective measurement. By setting a second alignment tolerance range, the measurement results of both objective and subjective measurements can be obtained in a good manner.

[0113] Furthermore, for example, the optometry device of this embodiment includes an objective measurement optical system and a subjective measurement optical system, and comprises a measurement unit having a pair of left-eye measurement units and a right-eye measurement unit, with the left-eye measurement unit positioned relative to the left eye and the right-eye measurement unit positioned relative to the right eye. This makes it possible to perform not only monocular vision measurement using either the left-eye measurement unit or the right-eye measurement unit, but also binocular vision measurement using both the left-eye measurement unit and the right-eye measurement unit.

[0114] Furthermore, for example, the optometry device of this embodiment enables binocular fusion between the left and right eyes by projecting a target beam from the left eye measurement unit to the left eye and a target beam from the right eye measurement unit to the right eye. For example, when measuring the binocular vision function of the eye being examined, if the alignment tolerance range of the subjective measurement is narrow and the test target appears to move, the fusion state in both eyes may be released, causing the left and right test targets to appear separated, which can be cumbersome. However, by setting a wider alignment tolerance range for the subjective measurement, the separation of the test targets can be suppressed, and measurement results can be obtained with high accuracy.

[0115] <Example of transformation> In this embodiment, a configuration in which the subject's face is fixed with a forehead rest 4 and a chin rest 5 has been described as an example, but the embodiment is not limited to this. For example, the subject's face may be fixed with only the forehead rest 4. For example, in subjective measurements that proceed based on the subject's responses, when the subject speaks with their chin touching the chin rest 5, the subject's eye E tends to move particularly in the Y direction. By not using the chin rest 5 and using only the forehead rest 4, such movement in the Y direction may be suppressed.

[0116] In this embodiment, a configuration in which an acceptable alignment range B1 in the XY direction for objective measurement and an acceptable alignment range B2 in the XY direction for subjective measurement are set for the eye E under examination has been described as an example, but the embodiment is not limited to this. For example, since the subject's face is in contact with the forehead rest 4 and chin rest 5 and is not easily moved, an acceptable alignment range may be set only in the XY direction in both objective and subjective measurements to accommodate movement of the gaze. However, since the subject's face may move, an acceptable alignment range in the Z direction may also be set. In this case as well, the acceptable alignment range in the Z direction for subjective measurement may be set wider than the acceptable alignment range in the Z direction for objective measurement.

[0117] In this embodiment, a configuration in which the objective alignment tolerance range B1 and the subjective alignment tolerance range B2 are set to fixed values ​​in advance has been described as an example, but the embodiment is not limited to this. For example, the objective alignment tolerance range B1 may be changed to an arbitrary value. Also, for example, the subjective alignment tolerance range B2 may be changed to an arbitrary value. In this embodiment, at least the alignment tolerance range B2 may be changed to an arbitrary value.

[0118] For example, if the alignment tolerance range is larger than the pupil diameter of the eye E being examined, even if the measurement unit 7 is moved so that the corneal apex position K of eye E is within the alignment tolerance range, the target light beam from the subjective measurement optical system will be projected outside the pupil diameter, which may prevent eye E from recognizing the test target. In particular, if eye E has a small pupil, the alignment tolerance range B1 for objective measurement is set to a narrow tolerance range, so this is less likely to be a problem, but the alignment tolerance range B2 for subjective measurement is set to a wide tolerance range, so this is more likely to be a problem. For this reason, by changing the alignment tolerance range B2 to an arbitrary value according to the pupil diameter of eye E, the examiner can obtain accurate measurement results while suppressing the inconvenience of the test target appearing to move during subjective measurement.

[0119] Furthermore, the alignment tolerance range B2 for subjective measurement may be automatically changed to an appropriate value depending on the pupil diameter of the eye E being examined. In this case, the control unit 70 acquires the pupil diameter of the eye E being examined and changes the alignment tolerance range B2 based on the pupil diameter. For example, the pupil diameter of the eye E being examined may be acquired by detecting the pixel position corresponding to the pupil or the pixel position corresponding to the iris based on the brightness information of the anterior segment image 300. Alternatively, for example, the pupil diameter of the eye E being examined may be acquired by the examiner by operating the switch unit 6b. The control unit 70 may also change the alignment tolerance range B2 by setting a predetermined alignment tolerance range associated with the pupil diameter.

[0120] In this embodiment, during subjective measurement of the eye E under examination, if the amount of deviation Δd between the eye E under examination and the alignment reference position N falls outside the alignment tolerance range B2, the measurement unit 7 is moved to bring the deviation amount Δd back into the alignment tolerance range B2. However, the embodiment is not limited to this. For example, if the deviation amount Δd falls outside the alignment tolerance range B2, the measurement unit 7 may be moved to bring the deviation amount Δd back into the alignment tolerance range B1. In other words, the alignment tolerance range B2 of subjective measurement is used to detect whether or not the deviation amount Δd is within the alignment tolerance range, and the alignment tolerance range B1 of objective measurement may be used when performing tracking control (restarting alignment) based on this detection result. This increases the time between the alignment of the eye E under examination and the measurement unit 7 and the occurrence of another misalignment, and as a result, the frequency of tracking control can be reduced.

[0121] In this embodiment, we have described an example configuration in which the refractive power of the left and right eyes of the eye under examination E is measured one eye at a time while binocular vision is being performed, but we are not limited to this. In this embodiment, the refractive power of the right eye can also be measured with the left eye covered by an occluder, and then the refractive power of the left eye can be measured with the right eye covered by an occluder. In other words, measurements can be performed on one eye while either the left or right eye is in a monocular vision state. Even in such cases, by setting the alignment tolerance range B2 for subjective measurement to a wider tolerance range than the alignment tolerance range B1 for objective measurement of the eye under examination E, the movement of the test target in subjective measurement becomes less noticeable, and measurement results can be obtained with high accuracy.

[0122] In this embodiment, tracking control based on the alignment tolerance range B1 of the objective measurement may be continuously performed from the time the objective measurement of the eye E is completed and the presentation of the fixation target is stopped until the subjective measurement is started and the test target is presented. In this case, control to switch between executing and stopping tracking control, such as stopping tracking control when the fixation target is turned off and restarting tracking control when the test target is turned on, is unnecessary, and the complexity of the control is suppressed.

[0123] Furthermore, in this embodiment, tracking control based on the alignment tolerance range B1 of the objective measurement may be stopped between the completion of the objective measurement of the eye E and the discontinuation of the fixation target presentation, and the commencement of the subjective measurement and the presentation of the test target. In this case, since the movement of the measurement unit 7 is stopped when the fixation target is turned off, even if the gaze of the eye under examination moves significantly before the test target is presented, the measurement unit 7 will not follow the eye under examination. When the eye under examination views the test target, the gaze returns to approximately its original position (the position when the fixation target was turned off), so when tracking control based on the alignment tolerance range B1 is restarted, the amount of movement of the measurement unit 7 becomes smaller, and as a result, the subjective measurement can be carried out more easily.

[0124] In this embodiment, the measurement unit 7 and the concave mirror 85 may be moved relative to the eye under examination while maintaining the positional relationship between the measurement unit 7 and the concave mirror 85, and the measurement unit 7 may be moved relative to the concave mirror 85, thereby aligning the projection optical system 10a and the light projection optical system 30 with the eye under examination (see Japanese Patent Application No. 2021-086210 for details). In this case as well, similar to this embodiment, the alignment tolerance range B2 for subjective measurement may be set to a wider tolerance range than the alignment tolerance range B1 for objective measurement. [Explanation of symbols]

[0125] 7 Measuring part 10 Objective measurement optical system 25. Subjective measurement optical system 70 Control Unit 75 memory 81. Polarizing mirror 84 Reflective mirror 85 Concave mirror 100 optometry devices

Claims

1. An ophthalmoscope for measuring the optical properties of the eye under examination, An objective measurement optical system for objectively measuring the optical properties of the eye under examination, comprising: a first light projection optical system that projects a measurement light beam onto the fundus of the eye under examination; and a light receiving optical system that receives the reflected light beam, which is reflected from the fundus of the eye under examination, using a detector. A subjective measurement optical system for subjectively measuring the optical characteristics of the eye under examination, comprising: a second projection optical system that projects a target light beam toward the eye under examination; and a corrective optical system disposed in the optical path of the second projection optical system that changes the optical properties of the target light beam. A first control means for performing a first alignment process based on a first alignment tolerance range for determining the positional misalignment between the eye under examination and the objective measurement optical system, A second control means for performing a second alignment process based on a second alignment tolerance range for determining the positional misalignment between the eye under examination and the subjective measurement optical system, When the measurement of the eye under examination is switched from one of the objective measurement using the objective measurement optical system to the other of the subjective measurement using the subjective measurement optical system, a change control means is provided to change the first alignment tolerance range corresponding to the objective measurement and the second alignment tolerance range corresponding to the subjective measurement. Equipped with, The second alignment tolerance range is wider than the first alignment tolerance range. The change control means is characterized in that it sets the second alignment tolerance range when the optical characteristics of the eye to be examined are objectively measured by the objective measurement optical system while the optical characteristics of the eye to be examined are being subjectively measured by the subjective measurement optical system.

2. In the eye examination device of claim 1, The first control means adjusts the relative positional relationship between the eye under examination and the objective measurement optical system as the first alignment process, The optometry device is characterized in that the second control means adjusts the relative positional relationship between the eye to be examined and the subjective measurement optical system as the second alignment process.

3. An ophthalmoscope for measuring the optical properties of an eye to be examined, An objective measurement optical system for objectively measuring the optical properties of the eye under examination, comprising: a first light projection optical system that projects a measurement light beam onto the fundus of the eye under examination; and a light receiving optical system that receives the reflected light beam, which is reflected from the fundus of the eye under examination, using a detector. A subjective measurement optical system for subjectively measuring the optical characteristics of the eye under examination, comprising: a second projection optical system that projects a target light beam toward the eye under examination; and a corrective optical system disposed in the optical path of the second projection optical system that changes the optical properties of the target light beam. A first control means for performing a first alignment process based on a first alignment tolerance range for determining the positional misalignment between the eye under examination and the objective measurement optical system, A second control means for performing a second alignment process based on a second alignment tolerance range for determining the positional misalignment between the eye under examination and the subjective measurement optical system, When the measurement of the eye under examination is switched from one of the objective measurement using the objective measurement optical system to the other of the subjective measurement using the subjective measurement optical system, a change control means is provided to change the first alignment tolerance range corresponding to the objective measurement and the second alignment tolerance range corresponding to the subjective measurement. Equipped with, The second alignment tolerance range is wider than the first alignment tolerance range. The first control means adjusts the first relative positional relationship between the eye under examination and the objective measurement optical system as the first alignment process, The second control means adjusts the second relative positional relationship between the eye under examination and the subjective measurement optical system as the second alignment process, The change control means is capable of changing the first alignment tolerance range and the second alignment tolerance range in the subjective measurement. An optometry device characterized in that, in the subjective measurement described above, the first alignment tolerance range is set by the change control means, the adjustment of the second positional relationship with respect to the first alignment tolerance range is initiated by the second control means, and when the second positional relationship falls within the first alignment tolerance range, the change control means changes it to the second alignment tolerance range, and the second control means adjusts the second positional relationship with respect to the second alignment tolerance range.

4. An objective measurement optical system for objectively measuring the optical properties of the eye under examination, comprising: a first light projection optical system that projects a measurement light beam onto the fundus of the eye under examination; and a light receiving optical system that receives a reflected light beam, which is reflected from the measurement light beam at the fundus, using a detector. A subjective measurement optical system for subjectively measuring the optical characteristics of the eye under examination, comprising: a second projection optical system that projects a target light beam toward the eye under examination; and a corrective optical system disposed in the optical path of the second projection optical system that changes the optical properties of the target light beam. Equipped with, An eye examination program used in an eye examination device for measuring the optical properties of the eye to be examined, By being executed by the processor of the aforementioned ophthalmic device, A first control step which performs a first alignment process based on a first alignment tolerance range for determining the misalignment between the eye under examination and the objective measurement optical system, A second control step of performing a second alignment process based on a second alignment tolerance range for determining the misalignment between the eye under examination and the subjective measurement optical system, A change control step is performed when the measurement of the eye under examination is switched from one of the objective measurement using the objective measurement optical system to the other of the subjective measurement using the subjective measurement optical system, to change the first alignment tolerance range corresponding to the objective measurement and the second alignment tolerance range corresponding to the subjective measurement. The eye examination device is made to perform the following: The second alignment tolerance range is wider than the first alignment tolerance range. The change control step is a optometry program characterized by setting the second alignment tolerance range when the optical properties of the eye under examination are objectively measured by the objective measurement optical system while the optical properties of the eye under examination are subjectively measured by the subjective measurement optical system.

5. An objective measurement optical system for objectively measuring the optical properties of the eye under examination, comprising: a first light projection optical system that projects a measurement light beam onto the fundus of the eye under examination; and a light receiving optical system that receives the reflected light beam, which is reflected from the measurement light beam at the fundus, using a detector. A subjective measurement optical system for subjectively measuring the optical characteristics of the eye under examination, comprising: a second projection optical system that projects a target light beam toward the eye under examination; and a corrective optical system disposed in the optical path of the second projection optical system that changes the optical properties of the target light beam. Equipped with, An eye examination program used in an eye examination device for measuring the optical properties of the eye to be examined, By being executed by the processor of the aforementioned ophthalmic device, A first control step which performs a first alignment process based on a first alignment tolerance range for determining the misalignment between the eye under examination and the objective measurement optical system, A second control step of performing a second alignment process based on a second alignment tolerance range for determining the misalignment between the eye under examination and the subjective measurement optical system, A change control step is performed when the measurement of the eye under examination is switched from one of the objective measurement using the objective measurement optical system to the other of the subjective measurement using the subjective measurement optical system, to change the first alignment tolerance range corresponding to the objective measurement and the second alignment tolerance range corresponding to the subjective measurement. The eye examination device is made to perform the following: The second alignment tolerance range is wider than the first alignment tolerance range. The first control step, as the first alignment process, adjusts the first relative positional relationship between the eye under examination and the objective measurement optical system. The second control step, as the second alignment process, adjusts the second relative positional relationship between the eye under examination and the subjective measurement optical system. The change control step makes it possible to change the first alignment tolerance range and the second alignment tolerance range in the subjective measurement. An ophthalmography program characterized in that, in the subjective measurement, the first alignment tolerance range is set by the change control step, the adjustment of the second positional relationship with respect to the first alignment tolerance range is initiated by the second control step, and when the second positional relationship falls within the first alignment tolerance range, the change control step changes it to the second alignment tolerance range, and the second control step adjusts the second positional relationship with respect to the second alignment tolerance range.

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