JP6841091B2 - Subjective optometry device - Google Patents

Description

The present disclosure relates to a subjective optometry device for measuring the optical properties of an eye to be inspected.

By arranging an optical member such as a spherical lens or a columnar lens in front of the subject's eye and presenting an inspection target to the subject's eye via this optical member, the optical characteristics (refractive power, etc.) of the subject's eye are measured. A subjective optometry device is known (see Patent Document 1). When measuring the optical characteristics of the eye to be inspected, alignment is performed between the eye to be inspected and the subjective optometry device.

Japanese Unexamined Patent Publication No. 5-176893

In subjective optometry, different optometry targets according to the visual acuity value of the optometry are set to a certain size for each optometry by aligning the optometry with the optometry device. Presented. However, in a subjective optometry device in which the luminous flux is projected toward the eye to be inspected through a fixedly arranged optical member, the position of the luminous flux incident on the optical member changes depending on the alignment state. There is. When the incident position of the target luminous flux with respect to the optical member changes, the imaging position of the target luminous flux moves, so that the projection magnification of the inspection target presented to the eye to be inspected changes. Therefore, even if the eye to be inspected and the subjective optometry device are properly aligned, it may not be possible to measure the correct optical characteristics of the eye to be inspected.

In view of the above-mentioned prior art, it is a technical subject of the present disclosure to provide a subjective optometry apparatus and a subjective optometry program capable of easily and accurately performing subjective optometry.

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

(1) The subjective optometry apparatus according to the first aspect of the present disclosure is such that the projection optical system that projects the target light beam onto the eye to be inspected and the image of the target light beam are optically set at a predetermined inspection distance. It is provided with a fixed optical member that guides the eye to be inspected and a correction optical system that is in the optical path of the light projecting optical system and changes the optical characteristics of the eye to be inspected, and is aware of the optical characteristics of the eye to be inspected. Based on the measurement unit that houses the projection optical system, the acquisition means that acquires the relative position information between the fixed optical member and the measurement unit, and the relative position information. The target light beam is based on a correction amount setting means for setting a correction amount for correcting the projection magnification of the target light beam projected on the eye to be inspected and the correction amount set by the correction amount setting means. It is characterized by comprising a correction means for correcting the projection magnification of the above.
(2) In the subjective eye examination program according to the second aspect of the present disclosure, the projection optical system that projects the target light beam onto the eye to be inspected and the image of the target light beam are optically set to a predetermined inspection distance. It is provided with a fixed optical member that guides the eye to be inspected and a correction optical system that is in the optical path of the light projecting optical system and changes the optical characteristics of the eye to be inspected, and is aware of the optical characteristics of the eye to be inspected. A subjective eye examination program used in a subjective eye examination device for measuring a device, which is executed by a processor of the subjective eye examination device to accommodate a light projection optical system and a fixed optical member. And the acquisition step of acquiring the relative position information of the measurement unit accommodating the projection optical system, and the correction for correcting the projection magnification of the target light beam projected on the eye to be inspected based on the relative position information. To have the subjective eye examination device execute a correction amount setting step for setting the amount and a correction step for correcting the projection magnification of the target light beam based on the correction amount set by the correction amount setting step. It is characterized by.

It is an external view of the subjective optometry apparatus which concerns on this Example. It is a figure explaining the structure of the measuring means. It is a schematic block diagram which looked at the inside of the subjective optometry apparatus from the front direction. It is a schematic block diagram which looked at the inside of the subjective optometry apparatus from the side direction. It is a schematic block diagram which looked at the inside of the subjective optometry apparatus from the upper surface direction. It is a figure which shows the control system of the subjective optometry apparatus. It is a flowchart which shows the control operation. It is a figure explaining the pupil conjugate position in the measuring means. It is a figure which shows the anterior eye part image of the eye to be examined. It is a figure explaining the visual angle of the eye to be examined. It is a figure explaining the change of the viewing angle by alignment. It is a figure explaining the change of the visual angle according to the refractive power of the eye to be examined.

<Overview>
Hereinafter, one of the typical embodiments will be described with reference to the drawings. 1 to 12 are views for explaining the subjective optometry apparatus according to the present embodiment. The present disclosure is not limited to the apparatus described in this embodiment. For example, terminal control software (program) that performs the functions of the following examples is supplied to the system or device via a network or various storage media, and the system or device control device (for example, CPU) reads the program. It is also possible to do it. The items classified by <> below can be used independently or in relation to each other.

In the following description, the depth direction (front-back direction of the subject) of the subjective eye examination device is the Z direction, and the horizontal direction (left-right direction of the subject) on the plane perpendicular to the depth direction is the X direction and the depth direction. The vertical direction (vertical direction of the subject) on a vertical plane will be described as the Y direction. It should be noted that L and R attached to the reference numerals indicate those for the left eye and those for the right eye, respectively.

For example, the subjective optometry device (for example, the subjective optometry device 1) in the present embodiment includes a light projecting optical system (for example, a light projecting optical system 30) and a corrective optical system (for example, a corrective optical system 60, subjective measurement). It has an optical system 25) and, and subjectively measures the optical characteristics of the eye to be inspected.

For example, the optical characteristics of the eye to be measured that are subjectively measured include optical power (for example, at least one of spherical power, astigmatic power, astigmatic axis angle, etc.), contrast sensitivity, and binocular vision function (for example, oblique position). It may be at least one of quantity, at least one of stereoscopic functions, etc.).

For example, the projectile optical system projects the target luminous flux toward the eye to be inspected. For example, the correction optical system is arranged in the optical path of the projection optical system and changes the optical characteristics of the target luminous flux. The light projecting optical system does not need to be integrally provided in the subjective optometry device, and a device provided with a light projecting optical system may be separately provided. That is, the subjective optometry device in the present embodiment may be configured to include at least a corrective optical system.

<Throwing optical system>
For example, a projectile optical system has a light source that irradiates an optotype luminous flux. Further, for example, the projection optical system may include at least one or more optical members that guide the target luminous flux projected from the light source that projects the target luminous flux toward the eye to be inspected.

For example, a display (for example, display 31) may be used as the light source for projecting the luminous flux. For example, as a display, an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), or the like is used. For example, an inspection target such as a Randold ring optotype is displayed on the display.

For example, a DMD (Digital Micromirror Device) may be used as a light source for projecting an optotype luminous flux. In general, DMD has high reflectance and is bright. Therefore, the amount of light of the target luminous flux can be maintained as compared with the case of using a liquid crystal display using polarized light.

For example, the light source for projecting the optotype luminous flux may have a configuration including a visible light source for presenting an optotype and an optotype plate. In this case, for example, the optotype plate is a rotatable disc plate and has a plurality of optotypes. The plurality of optotypes include, for example, a visual acuity test optotype used at the time of subjective measurement. For example, as a visual acuity test target, visual acuity values (visual acuity values 0.1, 0.3, ..., 1.5) are prepared for each visual acuity value. For example, the optotype plate is rotated by a motor or the like, and the optotypes are switched and arranged on an optical path in which the optotype luminous flux is guided to the eye to be inspected. Of course, as the light source for projecting the target luminous flux, a light source other than the above configuration may be used.

For example, in the present embodiment, the projection optical system may include a pair of left and right eye projection optical systems and a left eye projection optical system. For example, in the right-eye projection optical system and the left-eye projection optical system, the members constituting the right-eye projection optical system and the members constituting the left-eye projection optical system are composed of the same members. It may have been. Further, for example, the right-eye projection optical system and the left-eye projection optical system are at least a part of the members constituting the right-eye projection optical system and the members constituting the left-eye projection optical system. The members may be composed of different members. For example, in the right-eye projection optical system and the left-eye projection optical system, at least a part of the members constituting the right-eye projection optical system and the members constituting the left-eye projection optical system is used. It may be a configuration that is also used. Further, for example, in the right eye projection optical system and the left eye projection optical system, a member constituting the right eye projection optical system and a member constituting the left eye projection optical system are separately provided. It may be the configuration that is provided.

<Correction optical system>
For example, the correction optical system may have a configuration that changes the optical characteristics of the target luminous flux (for example, at least one of spherical power, cylindrical power, cylindrical axis, polarization characteristics, aberration amount, and the like). For example, the optical element may be controlled as a configuration for changing the optical characteristics of the target luminous flux. For example, the optical element may be configured to use at least one of a spherical lens, a cylindrical lens, a cross cylinder lens, a rotary prism, a wave surface modulation element, and the like. Of course, for example, as the optical element, an optical element different from the above-mentioned optical element may be used.

For example, the correction optical system may have a configuration in which the spherical power of the eye to be inspected is corrected by optically changing the presentation position (presentation distance) of the optotype with respect to the eye to be inspected. In this case, for example, as a configuration in which the presentation position (presentation distance) of the optotype is optically changed, the light source (for example, the display) may be moved in the optical axis direction. Further, in this case, for example, an optical element (for example, a spherical lens) arranged in the optical path may be moved in the optical axis direction. Of course, the correction optical system may have a configuration in which the optical element is controlled and the optical element arranged in the optical path is moved in the optical axis direction.

For example, the corrective optical system may be an optometry unit (folopter) in which optical elements arranged in front of the eye to be inspected are switched and arranged. For example, the optometry unit has a lens disk in which a plurality of optical elements are arranged on the same circumference and a driving means for rotating the lens disk, and the optical element is driven by the driving means (for example, a motor). May be configured to be electrically switched.

For example, as the correction optical system, an optical element is arranged between an optical member for guiding the target light beam from the projection optical system toward the eye to be inspected and a light source of the projection optical system. The optical characteristics of the target light beam may be changed by controlling the above. That is, as the correction means, a phantom lens refractometer (phantom correction optical system) may be configured. In this case, for example, the target luminous flux corrected by the correction optical system is guided to the eye to be inspected via the optical member.

For example, in the present embodiment, the orthodontic optical system includes a pair of left and right corrective optical systems for the right eye and a corrective optical system for the left eye. For example, in the right eye correction optical system and the left eye correction optical system, even if the member constituting the right eye correction optical system and the member constituting the left eye correction optical system are composed of the same member. Good. Further, for example, the right eye correction optical system and the left eye correction optical system are members in which at least a part of the members is different between the member constituting the right eye correction optical system and the member constituting the left eye correction optical system. It may be composed of. For example, in the correction optical system for the right eye and the correction optical system for the left eye, at least a part of the members constituting the correction optical system for the right eye and the member constituting the correction optical system for the left eye are shared. It may be a configuration. Further, for example, the correction optical system for the right eye and the correction optical system for the left eye have a configuration in which a member constituting the correction optical system for the right eye and a member constituting the correction optical system for the left eye are separately provided. It may be.

<Correction of projection magnification of the target luminous flux based on the displacement of the eye to be inspected and the refractive power of the eye>
For example, the subjective optometry apparatus according to the present embodiment may include an acquisition means (for example, a control unit 70) for acquiring the correction power of the correction optical system. Further, for example, the subjective optometry apparatus according to the present embodiment may include a detection means (for example, a control unit 70) for detecting the distance between the eye to be inspected and the pupil conjugate position of the light projection optical system. Further, for example, the subjective optometry device corrects the projection magnification of the target luminous flux projected on the eye to be inspected based on the detection result detected by the detection means and the correction power acquired by the acquisition means. The correction amount setting means (for example, the control unit 70) for setting the correction amount of the above may be provided. Further, for example, a correction means (for example, a control unit 70) that corrects the projection magnification of the target luminous flux may be provided based on the correction amount set by the correction amount setting means.

With the above configuration, the examiner is aware of the optical characteristics of the eye to be inspected by suppressing the deviation of the eye to be inspected from the conjugated position of the pupil and the change in the size of the optotype caused by the refractive power of the eye to be inspected. Can be measured. Therefore, the examiner can perform the subjective measurement with high accuracy.

Further, for example, when the position of the eye to be inspected is moved and it is difficult to align the pupil-conjugated position of the projection optical system with respect to the eye to be inspected, when the eye to be inspected is aligned with the pupil-conjugated position. The optotype can be presented in the same size as the optotype that can be observed. As a result, when the position of the eye to be examined is displaced, the size of the optotype is changed, and it is possible to prevent the subject from having difficulty in observing the optotype. That is, the examiner can perform the subjective measurement with high accuracy.

For example, the detection means is configured to detect the distance between the eye to be inspected and the pupil conjugate position of the light projection optical system, and is a configuration in which the eye to be inspected (for example, the apex of the cornea to be examined or the pupil position of the eye to be inspected) and the pupil conjugate position of the light projection optical system It may be configured to detect the distance to and from. Further, for example, as a configuration for detecting the distance between the eye to be inspected and the pupil conjugate position of the projection optical system, a configuration for detecting the alignment state of the eye to be inspected may be used. In this case, for example, the alignment reference position may be set and the amount of deviation from the alignment reference position may be detected to detect the alignment state of the eye to be inspected. The alignment reference position is a position where the alignment state is appropriate (for example, the alignment between the eye to be inspected and the measurement unit accommodating the projection optical system is appropriate). That is, when the eye to be inspected is aligned with the alignment reference position, the alignment state becomes appropriate, and the pupil position of the eye to be inspected for emmetropia (the eye to be inspected having an optical power of 0D) coincides with the pupil conjugate position. Further, for example, the distance from the eye to be inspected to a predetermined member (for example, the presentation window 3, the measuring means 7, etc.) in the subjective optometry device 1 when the eye to be inspected is aligned with the alignment reference position is used as the operating distance. You may do so. In this case, for example, the alignment reference position is a position for setting the working distance between the eye to be inspected and the subjective optometry device 1 to an appropriate working distance. When the working distance between the eye to be inspected and the subjective eye examination device 1 is an appropriate working distance, the pupil position of the emmetropic eye to be inspected (the eye to be inspected having an optical power of 0D) coincides with the pupil conjugate position. There is.

For example, the correction power by the correction optical system may be set by acquiring the eye refractive power of the eye to be inspected in advance and controlling the correction optical system based on the eye refractive power. In this case, for example, the subjective optometry device may have an optical power acquisition means for acquiring the optical power of the eye to be inspected. For example, the corrective optical system may be controlled based on the optical power obtained by the optical power acquisition means. After the correction optical system is controlled, the correction power may be acquired by the correction optical system and the correction amount may be set.

For example, the eye refractive power acquisition means measures the optical power of the eye to be inspected by measuring the optical power of the eye with an objective measurement optical system (for example, the objective measurement optical system 10) provided in the subjective eye examination device. It may be a configuration to be acquired. Further, for example, the eye refractive power acquisition means measures the optical power acquired by the subjective measurement optical system (for example, the objective measurement optical system 25) provided in the optometry device to measure the optical power of the eye to be inspected. It may be configured to acquire the optical power. In this case, for example, it may be the optical power obtained at the timing during the subjective measurement. Further, in this case, for example, the optical power may be measured at a timing different from that during the subjective measurement. Further, for example, the eye refractive power acquisition means receives the optical power measured by the objective measurement optical system or the subjective measurement optical system of a device different from the subjective eye examination device, thereby receiving the eye refractive power of the eye to be inspected. It may be configured to acquire force. Further, for example, the eye refractive power acquisition means may be configured to acquire the eye refractive power of the eye to be inspected by receiving the input optical power of the eye by operating the operating means by the examiner.

For example, the correction amount setting means may have a configuration in which a correction amount based on the distance between the eye to be inspected and the pupil conjugate position of the projection optical system and the refractive power of the eye is set in advance. In this case, for example, a correction table based on the distance between the eye to be inspected and the pupil conjugate position of the projection optical system and the optical power of refraction is stored in a storage means (for example, memory 75), and the correction amount is called from the storage means. Therefore, the correction amount may be set. Further, for example, the correction amount setting means may be configured to calculate the correction amount by performing arithmetic processing based on the distance between the eye to be inspected and the pupil conjugate position of the projection optical system and the refractive power of the eye. ..

<Correction of projection magnification of the target luminous flux based on the alignment between the eye to be inspected and the pupil conjugate position>
For example, the subjective optometry apparatus may include a fixed optical member (for example, a concave mirror 85) that guides an image of an optotype luminous flux to an eye to be inspected so as to optically reach a predetermined inspection distance. Further, for example, the subjective optometry apparatus may include a measuring unit (for example, measuring means 7) for accommodating the projection optical system. Further, for example, the subjective optometry device may include a position information acquisition means (for example, a control unit 70) for acquiring the position information of the measurement unit. For example, the subjective optometry device includes a correction amount setting means (for example, a control unit 70) that sets a correction amount for correcting the projection magnification of the target luminous flux projected on the eye to be inspected based on the position information. You may have it. Further, for example, the subjective optometry apparatus may include a correction means (for example, a control unit 70) that corrects the projection magnification of the target luminous flux based on the correction amount set by the correction amount setting means. For example, with the above configuration, in a subjective optometry device having a fixed optical member, when the deviation between the eye to be inspected and the pupil conjugate position of the projection optical system is adjusted, the optotype projected on the eye to be inspected. The examiner can project an optotype of the same size on the eye to be inspected even if the projection magnification changes. Therefore, it is possible to accurately measure the awareness of the eye to be inspected.

For example, it is acquired by a correction amount setting means for setting a correction amount for correcting the projection magnification of the target luminous flux projected on the eye to be inspected based on the position information, and a detection result and acquisition means detected by the detection means. The correction amount setting means for setting the correction amount for correcting the projection magnification of the target luminous flux projected on the eye to be inspected based on the correction power of the corrected optical system is configured to be used at least in part. There may be. Of course, the above-mentioned correction amount setting means may be separately provided.

For example, the fixed optical member may be fixedly arranged on the main body of the device. For example, the main body of the device may be configured to be fixedly arranged with respect to the eye to be inspected. For example, the fixed optical member may be configured to guide the target luminous flux corrected by the correction optical system to the eye to be inspected.

For example, a concave mirror may be used as the fixed optical member. For example, by using a concave mirror, it is possible to optically present an optotype at a predetermined inspection distance in a subjective inspection means, and when presenting an optotype at a predetermined inspection distance, it becomes an actual distance. It is not necessary to arrange the members and the like. As a result, extra members and space are not required, and the device can be miniaturized. Of course, the fixed optical member is not limited to the concave mirror. For example, the fixed optical member may be configured to guide the image of the target luminous flux to the eye to be inspected so as to optically have a predetermined inspection distance. In this case, for example, a lens or the like may be used as the fixed optical member.

For example, the position information acquisition means may have a configuration that can acquire the position information of the measurement unit. For example, the configuration for acquiring the position information of the measurement unit may be a configuration for detecting the movement of the measurement unit (for example, the position information of the measurement unit). The configuration for detecting the position information of the measurement unit may be a configuration for detecting the position of the measurement unit or a configuration for detecting the movement amount of the measurement unit. The position information of the measurement unit may be the position information of the entire measurement unit or the position information of at least one member of the projection optical system housed in the measurement unit. Further, the position information of the measurement unit may be the position information of the optical member moved together with the measurement unit in the subjective optometry device 1. In this case, the optical member moved together with the measuring unit may be configured to be moved integrally with the measuring unit.

Further, for example, the configuration for acquiring the position information of the measurement unit may be a configuration for acquiring the relative position information between the eye to be inspected (for example, the apex of the cornea to be inspected or the position of the pupil to be inspected) and the measurement unit. For example, when the position information acquisition means acquires the relative position information between the eye to be inspected and the measurement unit, the position information acquisition means acquires the relative position information by detecting each of the position of the eye to be inspected and the position of the measurement unit. There may be. For example, the position information acquisition means may be configured to acquire the relative position information by detecting the position of the measurement unit when acquiring the relative position information between the eye to be inspected and the measurement unit. In this case, for example, the position of the eye to be inspected may be stored in the storage means in advance. Further, for example, the position information acquisition means may be configured to acquire relative position information by detecting the movement amount of the measurement unit. In this case, for example, the movement amount may be detected in the measuring unit from the preset initial position. The position information of the measurement unit may be the position information of the entire measurement unit or the position information of at least one member of the projection optical system housed in the measurement unit.

Further, for example, the configuration for acquiring the position information of the measurement unit may be a configuration for acquiring the position information of the measurement unit by acquiring the relative position information between the fixed optical member and the measurement unit. For example, when the position information acquisition means acquires the relative position information between the fixed optical member and the measurement unit, the position information acquisition means acquires the relative position information by detecting each of the position of the fixed optical member and the position of the measurement unit. It may be a configuration. For example, the position information acquisition means may be configured to acquire the relative position information by detecting the position of the measurement unit when acquiring the relative position information between the fixed optical member and the measurement unit. In this case, for example, the position of the fixed optical member may be stored in the storage means in advance. Further, for example, the position information acquisition means may be configured to acquire relative position information by detecting the movement amount of the measurement unit. In this case, for example, the movement amount may be detected in the measuring unit from the preset initial position. The position information of the measurement unit may be the position information of the entire measurement unit or the position information of at least one member of the projection optical system housed in the measurement unit.

For example, the correction amount setting means may have a configuration in which a correction amount based on relative position information is set in advance. In this case, for example, the correction table based on the relative position information may be stored in the storage means, and the correction amount may be set by calling the correction amount from the storage means. Further, for example, the correction amount setting means may be configured to perform arithmetic processing and calculate the correction amount based on the relative position information.

For example, the subjective optometry device may include a detection means (for example, a control unit 70) that detects the distance between the eye to be inspected and the pupil conjugate position of the light projection optical system. Further, for example, the subjective optometry device is an adjusting means (for example, left eye driving means 9L, right eye driving) that adjusts the position of the measuring unit in the optical axis direction with respect to the fixed optical member based on the detection result by the detecting means. Means 9R) may be provided. As a result, when the position of the eye to be inspected is deviated, the distance between the fixed optical member and the measurement unit is automatically adjusted so that the pupil conjugate position of the projection optical system matches the eye to be inspected. .. Therefore, the examiner can easily align the measuring unit with respect to the eye to be inspected.

For example, the detecting means for detecting the distance between the eye to be inspected and the pupil conjugate position of the light projection optical system is configured to detect the distance between the eye to be inspected and the pupil conjugate position of the light projection optical system, and is configured to detect the distance between the eye to be inspected and the pupil conjugate position of the light projection optical system. It may be configured to detect the distance between the apex of the corneum or the pupil position of the eye to be inspected) and the pupil conjugate position of the projection optical system. Further, for example, as a configuration for detecting the distance between the eye to be inspected and the pupil conjugate position of the projection optical system, a configuration for detecting the alignment state of the eye to be inspected may be used.

The configuration in which the position of the measurement unit is adjusted based on the detection result by the detection means is given as an example, but the present invention is not limited to this. For example, the adjusting means may be configured to manually adjust the position of the measuring unit in the optical axis direction. In this case, for example, the position of the measuring unit may be adjusted by operating the operating means.

For example, the position of the measurement unit can be adjusted by moving at least a part of the members of the projection optical system housed in the measurement unit so that the pupil conjugate position of the projection optical system can be moved. All you need is.

<Correction means>
For example, the correction means may be configured to correct the projection magnification of the target luminous flux by changing the size of the target displayed on the display (for example, the display 31) based on the correction amount. In this case, the projection optical system may have a display, and the target luminous flux may be emitted by displaying the target on the display. For example, by changing the size of the optotype displayed on the display based on the set correction amount, the examiner can easily correct the projection magnification of the optotype luminous flux.

Further, for example, the correction means may correct the projection magnification of the target luminous flux by controlling the driving means and moving the optical member based on the correction amount. In this case, for example, the configuration may include an optical member that can move in the optical path of the projection optical system and a driving means that moves the optical member in the optical path of the projection optical system. For example, a lens, a prism, a mirror, or the like may be used as the optical member. Further, for example, the optical member may be any optical member in the projection optical system, or may be an optical member provided as a member separately from the projection optical system. For example, with such a configuration, the examiner can arrange the optical member at an appropriate position with respect to the eye to be inspected and can accurately correct the projection magnification of the target luminous flux.

For example, the correction means is configured to control the drive means to move the optical member, and by controlling the drive means to move the optical member in the optical axis direction of the projection optical system based on the correction amount. The configuration may be such that the projection magnification of the target luminous flux is corrected. For example, this allows the examiner to correct the projection magnification of the target luminous flux with a simple configuration. Further, for example, the correction means has a configuration in which the drive means is controlled to move the optical member, and the drive means is controlled based on the correction amount to insert and remove the optical member into the optical path of the projection optical system. , The configuration may be such that the projection magnification of the target luminous flux is corrected. For example, this allows the examiner to correct the projection magnification of the target luminous flux with a simple configuration.

<Example>
Hereinafter, the subjective optometry apparatus in this embodiment will be described. For example, the optometry device may include a conscious measuring means. Further, for example, the subjective optometry device may include an objective measuring means. In this embodiment, a subjective optometry device including both a subjective measuring means and an objective measuring means will be described as an example.

FIG. 1 shows an external view of the optometry device 1 according to the present embodiment. For example, the subjective optometry device 1 includes a housing 2, a presentation window 3, a monitor 4, a chin rest 5, a base 6, an anterior segment imaging optical system 100, and the like. For example, the housing 2 includes a measuring means 7 inside the housing 2 (details will be described later). For example, the presentation window 3 is used to present a target to the subject. For example, the target luminous flux from the measuring means 7 is projected onto the eye E of the subject through the presentation window 3.

For example, the monitor (display) 4 displays the optical characteristic results of the eye E to be inspected (for example, spherical refraction S, cylindrical refraction C, astigmatic axis angle A, etc.). For example, the monitor 4 is a touch panel. That is, in this embodiment, the monitor 4 functions as an operation unit (controller). For example, the signal corresponding to the operation instruction input from the monitor 4 is output to the control unit 70 described later. The monitor 4 does not have to be a touch panel type, and the monitor 4 and the operation unit may be provided separately. For example, in this case, as the operation unit, at least one of an operation means such as a mouse, a joystick, and a keyboard may be used.

For example, the monitor 4 may be a display mounted on the housing 2 or a display connected to the housing 2. For example, in this case, a personal computer display may be used. Moreover, you may use a plurality of displays together.

For example, the chin rest 5 keeps the distance between the optometry E and the optometry device 1 constant. In this embodiment, a configuration in which the chin rest 5 is used to keep the distance between the eye to be inspected E and the subjective optometry device 1 constant has been described as an example, but the present invention is not limited to this. For example, in this embodiment, a forehead pad, a face pad, or the like may be used in order to keep the distance between the eye to be inspected E and the subjective optometry device 1 constant. For example, the jaw base 5 and the housing 2 are fixed to the base 6.

For example, the anterior segment imaging optical system 100 is composed of an imaging element and a lens (not shown). For example, the anterior segment imaging optical system 100 is used to image the face of a subject.

<Measuring means>
For example, the measuring means 7 includes a measuring means 7L for the left eye and a measuring means 7R for the right eye. For example, the left eye measuring means 7L and the right eye measuring means 7R in this embodiment include the same member. That is, the subjective optometry device 1 in this embodiment has a pair of left and right subjective measuring means and a pair of left and right objective measuring means. Of course, the left-eye measuring means 7L and the right-eye measuring means 7R may have at least a part of different components.

FIG. 2 is a diagram illustrating the configuration of the measuring means 7. For example, in this embodiment, the left eye measuring means 7L will be described as an example. Since the right eye measuring means 7R has the same configuration as the left eye measuring means 7L, the description thereof will be omitted. For example, the measurement means 7L for the left eye includes a subjective measurement optical system 25, an objective measurement optical system 10, a first index projection optical system 45, a second index projection optical system 46, an observation optical system 50, and the like.

<Awareness optical system>
For example, the subjective measurement optical system 25 is used as a part of the configuration of the subjective measurement means for subjectively measuring the optical characteristics of the eye E to be inspected (details will be described later). For example, the optical characteristics of the eye to be inspected E include optical power, contrast sensitivity, binocular vision function (for example, oblique amount, stereoscopic vision function, etc.) and the like. In this embodiment, a subjective measuring means for measuring the refractive power of the eye to be inspected E will be described as an example. For example, the subjective measurement optical system 25 is composed of a projection optical system (objective projection system) 30, a correction optical system 60, and a correction optical system 90.

For example, the projection optical system 30 projects the target luminous flux toward the eye E to be inspected. For example, the projection optical system 30 includes a display 31, a projection lens 33, a projection lens 34, a reflection mirror 36, a dichroic mirror 35, a dichroic mirror 29, an objective lens 14, and the like. For example, the target light beam projected from the display 31 passes through the optical members in the order of the projection lens 33, the projection lens 34, the reflection mirror 36, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14, and the eye to be inspected E. Projected on.

For example, the display 31 displays an inspection target such as a Randold ring optotype, a fixation target for fixing the eye E to be inspected, and the like. For example, the target luminous flux from the display 31 is projected toward the eye E to be inspected. For example, in this embodiment, the following description will be given by taking as an example a case where an LCD (Liquid Crystal Display) is used as the display 31. As the display, an organic EL (Electro Luminescence) display, a plasma display, or the like can also be used.

For example, the correction optical system 60 is arranged in the optical path of the projection optical system 30. For example, the correction optical system 60 changes the optical characteristics of the target luminous flux. For example, the correction optical system 60 includes an astigmatism correction optical system 63 and a drive mechanism 39. For example, the astigmatism correction optical system 63 is arranged between the light projecting lens 34 and the light projecting lens 33. For example, the astigmatism correction optical system 63 is used to correct the cylindrical power, the cylindrical axis (astigmatism axis), and the like of the eye E to be inspected. For example, the astigmatism correction optical system 63 is composed of two positive cylindrical lenses 61a and 61b having the same focal length. The cylindrical lens 61a and the cylindrical lens 61b are independently rotated about the optical axis L2 by driving the rotation mechanisms 62a and 62b, respectively. In this embodiment, the configuration in which two positive cylindrical lenses 61a and 61b are used as the astigmatism correction optical system 63 has been described as an example, but the present invention is not limited to this. The astigmatism correction optical system 63 may have a configuration capable of correcting the cylindrical power, the astigmatism axis, and the like. In this case, for example, the correction lens may be moved in and out of the optical path of the light projecting optical system 30.

For example, the drive mechanism 39 includes a motor and a slide mechanism. For example, the drive mechanism 39 integrally moves the display 31 in the direction of the optical axis L2. For example, at the time of subjective measurement, by moving the display 31, the presentation position (presentation distance) of the optotype with respect to the eye E to be inspected is optically changed, and the spherical refractive power of the eye E to be inspected is corrected. That is, the movement of the display 31 constitutes a spherical power correction optical system. Further, for example, at the time of objective measurement, the movement of the display 31 causes cloud fog to be applied to the eye E to be inspected. The spherical power correction optical system is not limited to this. For example, the spherical power correction optical system may have a large number of optical elements and may be configured to perform correction by arranging the optical elements in the optical path. Further, for example, the spherical power correction optical system may have a configuration in which a lens arranged in an optical path is moved in the optical axis direction.

In this embodiment, the correction optical system for correcting the spherical power, the cylindrical power, and the cylindrical shaft is described as an example, but the present invention is not limited to this. For example, a correction optical system in which the prism value is corrected may be provided. By providing the correction optical system for the prism value, even if the subject has an oblique eye, the target luminous flux can be corrected so as to be projected onto the eye to be examined.

In this embodiment, the astigmatism correction optical system 63 for correcting the cylindrical power and the cylindrical axis (astigmatism axis) and the correction optical system (for example, the driving means 39) for correcting the spherical power are separately provided. The configuration to be provided has been described as an example, but the present invention is not limited to this. For example, the correction optical system may be configured to include a correction optical system in which the spherical power, the cylindricity, and the astigmatic axis are corrected. That is, the correction optical system in this embodiment may be an optical system that modulates the wave surface. Further, for example, the correction optical system may be an optical system that corrects spherical power, cylindrical power, astigmatic axis, and the like. In this case, for example, the correction optical system may include a lens disk in which a large number of optical elements (spherical lens, cylindrical lens, distributed prism, etc.) are arranged on the same circumference. The rotation of the lens disk is controlled by a drive unit (actuator, etc.), and the optical element (for example, a cylindrical lens, a cross cylinder lens, a rotary prism, etc.) desired by the examiner is rotated by the optical axis L2 at the rotation angle desired by the examiner. Is placed in. For example, switching of the optical element arranged on the optical axis L2 may be performed by operating the monitor 4 or the like.

The lens disc is composed of one lens disc or a plurality of lens discs. When a plurality of lens discs are arranged, a drive unit corresponding to each lens disc is provided. For example, as a lens disc group, each lens disc includes an aperture (or a 0D lens) and a plurality of optical elements. Typical types of each lens disc are a spherical lens disc having a plurality of spherical lenses having different powers, a cylindrical lens disc having a plurality of cylindrical lenses having different powers, and an auxiliary lens disc having a plurality of types of auxiliary lenses. At least one of a red filter / green filter, a prism, a cross cylinder lens, a polarizing plate, a Madox lens, and an auto cross cylinder lens is arranged on the auxiliary lens disc. Further, the cylindrical lens may be rotatably arranged around the optical axis L2 by the drive unit, and the rotary prism and the cross cylinder lens may be rotatably arranged around each optical axis by the drive unit.

For example, the correction optical system 90 is arranged between the objective lens 14 and the deflection mirror 81 described later. For example, the correction optical system 90 is used to correct optical aberrations (for example, astigmatism) that occur in subjective measurement. For example, the correction optical system 90 is composed of two positive cylindrical lenses 91a and 91b having the same focal length. For example, the correction optical system 90 corrects astigmatism by adjusting the cylindrical power and the astigmatic axis. The cylindrical lens 91a and the cylindrical lens 91b are independently rotated about the optical axis L3 by driving the rotation mechanisms 92a and 92b, respectively. In this embodiment, a configuration in which two positive cylindrical lenses 91a and 91b are used as the correction optical system 90 has been described as an example, but the present invention is not limited to this. The correction optical system 90 may have a configuration capable of correcting astigmatism. In this case, for example, the correction lens may be moved in and out of the optical axis L3.

In this embodiment, the configuration in which the correction optical system 90 is arranged separately from the correction optical system 60 has been described as an example, but the present invention is not limited to this. For example, the correction optical system 60 may be configured to also serve as the correction optical system 90. In this case, the cylindrical power and the cylindrical axis (astigmatism axis) of the eye E to be inspected are corrected according to the amount of astigmatism. That is, the correction optical system 60 is driven so as to correct the cylindrical power and the astigmatic axis in consideration of the amount of astigmatism. For example, by using the correction optical system 60 and the correction optical system 90 in combination, it is possible to correct optical aberrations with a simple configuration because complicated control is not required. Further, for example, by using the correction optical system 60 and the correction optical system 90 in combination, it is not necessary to separately provide a correction optical system for optical aberration, so that the optical aberration can be corrected with a simple configuration.

<Objective optical system>
For example, the objective measurement optical system 10 is used as a part of the configuration of the objective measurement means for objectively measuring the optical characteristics of the eye to be inspected (details will be described later). For example, the optical characteristics of the eye to be inspected include an optical power, an axial length, a corneal shape, and the like. In this embodiment, an objective measuring means for measuring the refractive power of the eye to be inspected will be described as an example. For example, the objective measurement optical system 10 is composed of a projection optical system 10a, a light receiving optical system 10b, and a correction optical system 90.

For example, the projection optical system (projection optical system) 10a projects a spot-shaped measurement index onto the fundus of the eye E to be inspected through the central portion of the pupil of the eye E to be inspected. For example, the light receiving optical system 10b takes out the fundus reflected light reflected from the fundus through the peripheral portion of the pupil in a ring shape, and causes the two-dimensional image pickup element 22 to image the ring-shaped fundus reflection image.

For example, the projection optical system 10a includes a measurement light source 11, a relay lens 12, a hall mirror 13, a prism 15, a drive unit (motor) 23, and a dichroic mirror 35 arranged on the optical axis L1 of the objective measurement optical system 10. The dichroic mirror 29 and the objective lens 14 are included. For example, the prism 15 is a luminous flux deflection member. For example, the drive unit 23 rotationally drives the prism 15 around the optical axis L1. For example, the light source 11 has a conjugate relationship with the fundus of the eye E to be inspected. Further, the hole portion of the hole mirror 13 has a conjugate relationship with the pupil of the eye E to be inspected. For example, the prism 15 is arranged at a position deviating from the position conjugate with the pupil of the eye E to be inspected, and eccentricizes the passing light flux with respect to the optical axis L1. Instead of the prism 15, a parallel flat plate may be diagonally arranged on the optical axis L1 as a light flux deflecting member.

For example, the dichroic mirror 35 shares the optical path of the subjective measurement optical system 25 and the optical path of the objective measurement optical system 10. That is, for example, in the dichroic mirror 35, the optical axis L2 of the subjective measurement optical system 25 and the optical axis L1 of the objective measurement optical system 10 are coaxial. For example, the dichroic mirror 29, which is an optical path branching member, reflects the luminous flux by the subjective measurement optical system 25 and the measurement light by the projection optical system 10a and guides them to the eye E to be inspected.

For example, the light receiving optical system 10b shares the objective lens 14, the dichroic mirror 29, the dichroic mirror 35, the prism 15, and the hole mirror 13 of the projection optical system 10a, and the relay lens 16 is arranged in the optical path in the reflection direction of the hall mirror 13. , A two-dimensional image pickup element 22 such as a mirror 17, a light receiving aperture 18, a collimator lens 19, a ring lens 20, and a CCD arranged in an optical path in the reflection direction of the mirror 17. For example, the light receiving diaphragm 18 and the two-dimensional image sensor 22 have a conjugate relationship with the fundus of the eye E to be inspected. For example, the ring lens 20 is composed of a ring-shaped lens portion and a light-shielding portion in which a region other than the lens portion is coated with a light-shielding portion, and is at a position optically conjugated with the pupil of the eye E to be inspected. It is a relationship. For example, the output from the two-dimensional image sensor 22 is input to the control unit 70.

For example, the dichroic mirror 29 reflects the reflected light of the measurement light from the projection optical system 10a guided to the fundus of the eye E to be examined toward the light receiving optical system 10. Further, for example, the dichroic mirror 29 transmits the anterior segment observation light and the alignment light and guides the dichroic mirror 29 to the observation optical system 50. For example, the dichroic mirror 35 reflects the reflected light of the measurement light from the projection optical system 10a guided to the fundus of the eye E to be examined toward the light receiving optical system 10.

The objective measurement optical system 10 is not limited to the above, and a ring-shaped measurement index is projected from the peripheral portion of the pupil onto the fundus to extract the fundus-reflected light from the central portion of the pupil, and the ring-shaped measurement index is applied to the two-dimensional image sensor 22. A well-known one such as a configuration for receiving a light-receiving image of the fundus of the fundus can be used.

The objective measurement optical system 10 is not limited to the above, and includes a light projecting optical system that projects the measurement light toward the fundus of the eye E to be inspected and a reflected light acquired by the reflection of the measurement light on the fundus. Any measurement optical system may be used as long as it has a light receiving optical system that receives light from the light receiving element. For example, the optical power measuring optical system may be configured to include a Shack-Hartmann sensor. Of course, a device having another measurement method may be used (for example, a phase difference type device that projects a slit).

For example, the light source 11 of the projection optical system 10a, the light receiving diaphragm 18, the collimator lens 19, the ring lens 20, and the two-dimensional image sensor 22 of the light receiving optical system 10b can be integrally moved in the optical axis direction. In this embodiment, for example, the light source 11 of the projection optical system 10a, the light receiving diaphragm 18 of the light receiving optical system 10b, the collimator lens 19, the ring lens 20, and the two-dimensional image sensor 22 are driven by a drive mechanism 39 that drives the display 31. It is integrally moved in the direction of the optical axis L1. That is, the display 31, the light source 11 of the projection optical system 10a, the light receiving diaphragm 18 of the light receiving optical system 10b, the collimator lens 19, the ring lens 20, and the two-dimensional image sensor 22 move integrally as the drive unit 95. Of course, each may be driven separately.

For example, the drive unit 95 moves a part of the objective measurement optical system 10 in the optical axis direction so that the outer ring light flux is incident on the two-dimensional image pickup device 22 in each meridian direction. That is, by moving a part of the objective measurement optical system 10 in the direction of the optical axis L1 according to the spherical refraction error (spherical refractive power) of the eye E to be inspected, the spherical refraction error is corrected and the fundus of the eye E to be inspected. The light source 11, the light receiving aperture 18, and the two-dimensional imaging element 22 are optically coupled to each other. For example, the moving position of the drive mechanism 39 is detected by a potentiometer (not shown). The hole mirror 13 and the ring lens 20 are arranged so as to be conjugated with the pupil of the eye E to be inspected at a constant magnification regardless of the amount of movement of the drive unit 95.

In the above configuration, the measured luminous flux emitted from the light source 11 passes through the relay lens 12, the hole mirror 13, the prism 15, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14, and is spot-shaped on the fundus of the eye E to be inspected. Form a point light source image. At this time, the prism 15 rotating around the optical axis causes the pupil projection image (projected luminous flux on the pupil) of the hole portion in the hall mirror 13 to be eccentrically rotated at high speed. The point light source image projected on the fundus is reflected and scattered, emitted from the eye E to be inspected, condensed by the objective lens 14, dichroic mirror 29, dichroic mirror 35, high-speed rotating prism 15, hall mirror 13, relay lens. 16. The light is focused again at the position of the light receiving aperture 18 via the mirror 17, and a ring-shaped image is formed on the two-dimensional image pickup element 22 by the collimator lens 19 and the ring lens 20.

For example, the prism 15 is arranged in the common optical path of the projection optical system 10a and the light receiving optical system 10b. For example, since the reflected luminous flux from the fundus of the eye passes through the same prism 15 as the projected optical system 10a, in the subsequent optical systems, reverse scanning is performed as if there was no eccentricity of the projected luminous flux / reflected luminous flux (received luminous flux) on the pupil. Will be done.

For example, the correction optical system 90 is also used as the subjective measurement optical system 25. Of course, a correction optical system used in the objective measurement optical system 10 may be separately provided.

<1st index projection optical system and 2nd index projection optical system>
For example, in this embodiment, the first index projection optical system 45 and the second index projection optical system 46 are arranged between the correction optical system 90 and the deflection mirror 81. Of course, the arrangement positions of the first index projection optical system 45 and the second index projection optical system 46 are not limited to this. For example, the first index projection optical system 45 and the second index projection optical system 46 may be provided on the cover of the housing 2. For example, in this case, the first index projection optical system 45 and the second index projection optical system 46 may be arranged around the presentation window 3.

For example, in the first index projection optical system 45, a plurality of infrared light sources are arranged concentrically around the optical axis L3 at intervals of 45 degrees, and are arranged symmetrically with a vertical plane passing through the optical axis L3. ing. For example, the first index projection optical system 45 emits near-infrared light for projecting an alignment index on the cornea of the eye E to be inspected. For example, the second index projection optical system 46 includes six infrared light sources arranged at different positions from the first index projection optical system 45. In this case, the first index projection optical system 45 projects an index at infinity onto the corneum of the eye E to be inspected from the left and right, and the second index projection optical system 46 projects an index of finite distance onto the corneum of the eye E to be inspected in the vertical direction. Alternatively, it is configured to project from an oblique direction. For convenience, FIG. 2 shows only a part of the first index projection optical system 45 and the second index projection optical system 46. The second index projection optical system 46 is also used as anterior segment illumination for illuminating the anterior segment of the eye E to be inspected. The second index projection optical system 46 can also be used as an index for measuring the shape of the cornea. The first index projection optical system 45 and the second index projection optical system 46 are not limited to the point light source. For example, it may be a ring-shaped light source or a line-shaped light source.

<Observation optical system>
For example, the observation optical system (imaging optical system) 50 shares the objective lens 14 and the dichroic mirror 29 in the subjective measurement optical system 25 and the objective measurement optical system 10, and includes an image pickup lens 51 and a two-dimensional image pickup element 52. .. For example, the image pickup device 52 has an image pickup surface arranged at a position substantially conjugate with the anterior segment of the eye E to be inspected. For example, the output from the image sensor 52 is input to the control unit 70. As a result, the anterior segment image of the eye E to be inspected is captured by the two-dimensional image sensor 52 and displayed on the monitor 4. The observation optical system 50 also serves as an optical system for detecting an alignment index image formed on the cornea of the eye E to be inspected by the first index projection optical system 45 and the second index projection optical system 46, and is operated by the control unit 70. The position of the alignment index image is detected.

<Internal configuration of subjective optometry device>
Hereinafter, the internal configuration of the subjective optometry device 1 will be described. FIG. 3 is a schematic configuration diagram of the inside of the subjective optometry device 1 according to the present embodiment as viewed from the front direction (direction A in FIG. 1). FIG. 4 is a schematic configuration diagram of the inside of the subjective optometry device 1 according to the present embodiment as viewed from the side direction (direction B in FIG. 1). FIG. 5 is a schematic configuration diagram of the inside of the subjective optometry device 1 according to the present embodiment as viewed from the upper surface direction (direction C in FIG. 1). In FIG. 3, for convenience of explanation, the optical axis showing the reflection of the half mirror 84 is omitted. Further, in FIG. 4, for convenience of explanation, only the optical axis of the left eye measuring means 7L is shown. Further, in FIG. 5, for convenience of explanation, only the optical axis of the left eye measuring means 7L is shown.

For example, the subjective optometry device 1 includes a subjective measuring means and an objective measuring means. For example, the subjective measuring means includes a measuring means 7, a deflection mirror 81, a driving means 82, a driving means 83, a half mirror 84, and a concave mirror 85. Of course, the subjective measuring means is not limited to this configuration. As an example, the configuration may not have the half mirror 84. In this case, the optical axis of the concave mirror 85 may be irradiated with a light beam from an oblique direction, and the reflected light beam may be guided to the eye E to be inspected. For example, the objective measuring means includes a measuring means 7, a deflection mirror 81, a half mirror 84, and a concave mirror 85. Of course, the objective measuring means is not limited to this configuration. As an example, the configuration may not have the half mirror 84. In this case, the optical axis of the concave mirror 85 may be irradiated with a light beam from an oblique direction, and the reflected light beam may be guided to the eye E to be inspected.

For example, the subjective optometry device 1 has a left eye driving means 9L and a right eye driving means 9R, and can move the left eye measuring means 7L and the right eye measuring means 7R in the X direction, respectively. .. For example, by moving the measuring means 7L for the left eye and the measuring means 7R for the right eye, the distance between the deflection mirror 81 and the measuring means 7 is changed, and the presentation position of the luminous flux in the Z direction is changed. To. As a result, the target luminous flux corrected by the correction optical system 60 is guided to the eye E to be inspected, and the image of the target luminous flux corrected by the correction optical system 60 is measured so as to be formed on the fundus of the eye E to be inspected. The means 7 can be adjusted in the Z direction.

For example, the deflection mirror 81 has a deflection mirror 81R for the right eye and a deflection mirror 81L for the left eye, which are provided in pairs on the left and right. For example, the deflection mirror 81 is arranged between the correction optical system 60 and the eye E to be inspected. That is, the corrective optical system 60 has a pair of left and right corrective optical systems for the left eye and a corrective optical system for the right eye, and the deflection mirror 81L for the left eye has the corrective optical system for the left eye and the left eye. It is placed between the eye ERs and the deflection mirror 81R for the right eye is placed between the right eye corrective optics and the right eye ER. For example, the deflection mirror 81 is preferably arranged at the conjugate position of the pupil.

For example, the deflection mirror 81L for the left eye reflects the luminous flux projected from the measuring means 7L for the left eye and guides the light beam to the left eye subject EL. Further, for example, the deflection mirror 81L for the left eye reflects the reflected light reflected by the left eye subject EL and guides the light to the measuring means 7L for the left eye. For example, the deflection mirror 81R for the right eye reflects the luminous flux projected from the measuring means 7R for the right eye and guides the light beam to the right eye subject ER. Further, for example, the deflection mirror 81R for the right eye reflects the reflected light reflected by the right eye subject ER and guides the light to the measuring means 7R for the right eye. In this embodiment, a configuration in which a deflection mirror 81 is used as a deflection member that reflects the light flux projected from the measuring means 7 and guides the light beam to the eye E to be inspected is described as an example, but the present invention is limited to this. Not done. The deflecting member may be any deflecting member that reflects the light flux projected from the measuring means 7 and guides the light beam to the eye E to be inspected. For example, examples of the deflection member include a prism and a lens.

For example, the drive means 82 includes a motor (drive unit) and the like. For example, the driving means 82 includes a driving means 82L for driving the deflection mirror 81L for the left eye and a driving means 82R for driving the deflection mirror 81R for the right eye. For example, the deflection mirror 81 rotates and moves by driving the driving means 82. For example, the driving means 82 rotates the deflection mirror 81 with respect to the rotation axis in the horizontal direction (X direction) and the rotation axis in the vertical direction (Y direction). That is, the driving means 82 rotates the deflection mirror 81 in the XY directions. The rotation of the deflection mirror 81 may be one of the horizontal direction and the vertical direction.

For example, the drive means 83 includes a motor (drive unit) and the like. For example, the driving means 83 includes a driving means 83L for driving the deflection mirror 81L for the left eye and a driving means 83R for driving the deflection mirror 81R for the right eye. For example, the deflection mirror 81 moves in the X direction by driving the drive means 83. For example, by moving the deflection mirror 81L for the left eye and the deflection mirror 81R for the right eye, the distance between the deflection mirror 81L for the left eye and the deflection mirror 81R for the right eye is changed, and the eye to be inspected. The distance between the optical path for the left eye and the optical path for the right eye in the X direction can be changed according to the interpupillary distance of E.

For example, a plurality of deflection mirrors may be provided 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 each of the left eye optical path and the right eye optical path (for example, two deflection mirrors in the left eye optical path) can be mentioned. In this case, one deflection mirror may be rotated in the X direction and the other deflection mirror may be rotated in the Y direction. For example, it is possible to optically correct the image formation position by deflecting the apparent luminous flux for forming the image of the correction optical system 60 in front of the eye to be inspected by rotating the deflection mirror 81. it can.

For example, the concave mirror 85 is shared by the right eye measuring means 7R and the left eye measuring means 7L. For example, the concave mirror 85 is shared by the right eye optical path including the right eye correction optical system and the left eye optical path including the left eye correction optical system. That is, the concave mirror 85 is arranged at a position where it passes through both the optical path for the right eye including the corrective optical system for the right eye and the optical path for the left eye including the corrective optical system for the left eye. Of course, the concave mirror 85 does not have to be a configuration shared by the optical path for the right eye and the optical path for the left eye. That is, a concave mirror may be provided at each of the optical path for the right eye including the corrective optical system for the right eye and the optical path for the left eye including the corrective optical system for the left eye. For example, the concave mirror 85 guides the target luminous flux that has passed through the correction optical system to the eye E to be inspected, and forms an image of the target luminous flux that has passed through the correction optical system in front of the eye E to be inspected. In this embodiment, the configuration using the concave mirror 85 has been described as an example, but the present invention is not limited to this, and various optical members can be used. For example, as the optical member, a lens, a plane mirror, or the like can be used.

For example, the concave mirror 85 is used as both a subjective measuring means and an objective measuring means. For example, the target luminous flux projected from the subjective measurement optical system 25 is projected onto the eye E to be inspected via the concave mirror 85. For example, the measurement light projected from the objective measurement optical system 10 is projected onto the eye E to be inspected through the concave mirror 85. Further, for example, the reflected light of the measurement light projected from the objective measurement optical system 10 is guided to the light receiving optical system 10b of the objective measurement optical system 10 via the concave mirror 85. In this embodiment, a configuration in which the reflected light of the measurement light by the objective measurement optical system 10 is guided to the light receiving optical system 10b of the objective measurement optical system 10 via the concave mirror 85 is given as an example. However, it is not limited to this. For example, the reflected light of the measurement light by the objective measurement optical system 10 may be configured not to pass through the concave mirror 85.

More specifically, for example, in the present embodiment, the optical axis between the concave mirror 85 and the eye E to be inspected in the subjective measuring means and the concave mirror 85 to the eye E in the objective measuring means. The optical axis is at least coaxial. For example, in this embodiment, the optical axis L2 of the subjective measurement optical system 25 and the optical axis L1 of the objective measurement optical system 10 are combined by the dichroic mirror 35 and are coaxial.

<Optical path of subjective measurement means>
Hereinafter, the optical path of the subjective measurement means will be described. For example, the subjective measurement means guides the target luminous flux to the eye E to be inspected by reflecting the luminous flux that has passed through the correction optical system 60 in the direction of the eye to be inspected by the concave mirror 85, and passes through the correction optical system 60. An image of the luminous flux is formed in front of the eye E to be inspected so as to optically have a predetermined inspection distance. That is, the concave mirror 85 reflects the target luminous flux so as to make it a substantially parallel luminous flux. Therefore, the optotype image seen by the subject appears to be farther than the actual distance from the eye E to be examined to the display 31. That is, by using the concave mirror 85, the target image can be presented to the subject so that the image of the target luminous flux can be seen at a position at a predetermined inspection distance.

This will be described in more detail. In the following description, the optical path for the left eye will be described as an example, but the optical path for the right eye has the same configuration as the optical path for the left eye. For example, in the subjective measurement means for the left eye, the luminous flux projected from the display 13 of the measurement means 7L for the left eye is incident on the astigmatism correction optical system 63 via the light projecting lens 33. The target light beam that has passed through the astigmatism correction optical system 63 is incident on the correction optical system 90 via the reflection mirror 36, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14. The target luminous flux that has passed through the correction optical system 90 is projected from the left eye measuring means 7L toward the left eye deflection mirror 81L. The luminous flux emitted from the left-eye measuring means 7L and reflected by the left-eye deflection mirror 81 is reflected by the half mirror 84 toward the concave mirror 85. The luminous flux reflected by the concave mirror passes through the half mirror 84 and reaches the left eye EL to be inspected.

As a result, an optotype image corrected by the correction optical system 60 is formed on the fundus of the left eye subject EL with reference to the spectacle wearing position of the left eye subject EL (for example, about 12 mm from the apex of the cornea). Therefore, the astigmatism correction optical system 63 was arranged in front of the eyes, and the spherical power was adjusted in front of the eyes by the correction optical system of the spherical power (in this embodiment, the drive mechanism 39 was driven). It is equivalent, and the subject can collimate the image of the optotype in a natural state through the concave mirror 85. In this embodiment, the optical path for the right eye has the same configuration as the optical path for the left eye, and the left and right sides are based on the spectacle wearing positions of both eye ERs and ELs (for example, about 12 mm from the apex of the cornea). The optotype image corrected by the pair of correction optical systems 60 is formed on the fundus of both eyes. In this way, the subject responds to the examiner while directly looking at the optotype in the state of natural vision, corrects by the correction optical system 60 until the inspection optotype looks appropriate, and based on the correction value. The optical characteristics of the eye to be examined are measured consciously.

<Optical path of objective measuring means>
Next, the optical path of the objective measuring means will be described. In the following description, the optical path for the left eye will be described as an example, but the optical path for the right eye has the same configuration as the optical path for the left eye. For example, in the objective measurement means for the left eye, the measurement light emitted from the light source 11 of the projection optical system 10a in the objective measurement optical system 10 passes through the relay lens 12 to the objective lens 14 and is corrected by the correction optical system 90. Incident in. The measurement light that has passed through the correction optical system 90 is projected from the left eye measuring means 7L toward the left eye deflection mirror 81L. The measurement light emitted from the left eye measuring means 7L and reflected by the left eye deflection mirror 81 is reflected by the half mirror 84 toward the concave mirror 85. The measurement light reflected by the concave mirror passes through the half mirror 84 and reaches the left eye EL to be inspected, and forms a spot-shaped point light source image on the fundus of the left eye subject EL. At this time, the pupil projection image (projected luminous flux on the pupil) of the hole portion of the hall mirror 13 is eccentrically rotated at high speed by the prism 15 rotating around the optical axis.

The light of the point light source image formed on the fundus of the left eye EL to be inspected is reflected and scattered to emit the eye E to be inspected, and is collected by the objective lens 14 through the optical path through which the measurement light has passed, and is collected by the objective lens 14 to be a dichroic mirror. 29, through the dichroic mirror 35, the prism 15, the hole mirror 13, the relay lens 16, and the mirror 17. The reflected light passing through the mirror 17 is collected again on the aperture of the light receiving diaphragm 18, is converted into a substantially parallel luminous flux (in the case of an emmetropic eye) by the collimator lens 19, and is taken out as a ring-shaped luminous flux by the ring lens 20. It is received by the image pickup element 22 as a ring image. By analyzing the received ring image, the optical characteristics of the eye E to be inspected can be objectively measured.

<Control unit>
FIG. 6 is a diagram showing a control system of the subjective optometry device 1 according to the present embodiment. For example, in the control unit 70, various members such as a monitor 4, a non-volatile memory 75 (hereinafter, memory 75), a measurement light source 11 included in the measuring means 7, an image pickup element 22, a display 31, and a two-dimensional image pickup element 52 are electrically used. It is connected to the. Further, for example, the control unit 70 is electrically connected to a drive unit (9), a drive mechanism (39), rotation mechanisms (62a and 62b), a drive means (83), and a drive unit (not shown) provided by the rotation mechanisms (92a and 92b), respectively.

For example, the control unit 70 includes a CPU (processor), RAM, ROM, and the like. For example, the CPU controls each member of the optometry device 1. For example, RAM temporarily stores various types of information. For example, the ROM stores various programs for controlling the operation of the subjective optometry device 1, optotype data for various examinations, initial values, and the like. The control unit 70 may be composed of a plurality of control units (that is, a plurality of processors).

For example, the memory 75 is a non-transient storage medium that can retain the stored contents even when the power supply is cut off. For example, as the memory 75, a hard disk drive, a flash ROM, a USB memory detachably attached to the optometry device 1 and the like can be used. For example, the memory 75 stores a control program for controlling the subjective measuring means and the objective measuring means.

<Control operation>
The operation of the subjective optometry device 1 having the above configuration will be described. For example, in this embodiment, before performing the subjective measurement, the objective measurement is performed on the eye E to be inspected by using the objective measurement optical system having the above-described configuration. In this case, for example, the control unit 70 acquires an objectively measured refractive power such as a spherical refractive power S, a cylindrical refractive power C, an astigmatic axis angle A, and a prism amount Δ possessed by the eye E to be inspected. That is, the control unit 70 acquires the objective refractive power (objective value) of the eye to be inspected E. Further, for example, the control unit 70 stores an objective value in the memory 75. For example, in the subjective measurement described later, when the subjective measurement is performed, the correction optical system 60 is controlled based on the acquired eye refractive power, and the measurement is started with the state in which the eye E to be inspected is corrected as the initial state.

For example, FIG. 7 is a flowchart showing a control operation in this embodiment. In the following, explanations will be given in order based on this flowchart.

<Detection and alignment of pupil conjugate position (S1)>
For example, at the start of the subjective measurement, the correction optical system 60 is controlled according to the eye refractive power of the eye E to be inspected by using the objective refractive power (objective value) described above. For example, the control unit 70 corrects the eye refractive power of the eye E to be inspected by moving the display 31 in the optical axis L2 direction based on the objective optical power obtained by the objective measurement. As an example, for example, when the refractive power of the eye to be examined E is -4.0D (diopter), the control unit 70 adjusts the optical axis of the display 31 so as to correct the refractive power of the eye to be examined E to 0D. Move in the L2 direction.

Further, for example, the control unit 70 may display a required visual acuity value visual acuity target (for example, a visual acuity value 1.0 target) on the display 31 as the initial presentation target. When the initial presentation target is presented to the eye E to be inspected, the examiner performs a distance vision measurement of the subject. For example, the examiner can switch the visual acuity value optotype displayed on the display by selecting a predetermined switch on the monitor 4. For example, if the subject's answer is correct, the examiner switches to a visual acuity target with a visual acuity value one step higher. On the other hand, if the subject's answer is incorrect, the visual acuity value is switched to one step lower. That is, the control unit 70 may switch the optotype to be displayed on the display 31 based on the visual acuity value change signal from the monitor 4. In this embodiment, the distance vision measurement will be described as an example, but the present invention is not limited to this. For example, the near vision measurement can be performed in the same manner as the distance vision measurement.

For example, the examiner instructs the subject to place his / her jaw on the chin rest 5 to observe the presentation window 3 and to fix the optotype. For example, when the anterior segment of the eye to be inspected E is detected by the anterior segment imaging optical system 100, the control unit 70 starts aligning the eye to be inspected E with the measuring means 7. That is, the control unit 70 starts automatic alignment.

FIG. 8 is a diagram showing an anterior segment image of the eye E to be inspected. For example, when detecting the alignment state, the light sources included in the first index projection optical system 45 and the second index projection optical system 46 are turned on. As a result, the index images Ma to Mh are projected on the eye E to be inspected in a ring shape. For example, the control unit 70 detects the XY center coordinates (cross mark shown in FIG. 8) in the index images Ma to Mah as the substantially corneal apex position. For example, the index images Ma and Me are at infinity, and the index images Mh and Mf are at finite distance. For example, when the optometry E is located at an appropriate working distance with respect to the subjective optometry device 1 (that is, when the optometry E is at the position Z1 described later), the image interval from the index image Ma to Me at infinity a and the image interval b from the index image Mh to Mf at a finite distance are set to have a certain ratio. In this embodiment, for example, the appropriate working distance is a position where the pupil position P of the eye E to be inspected and the pupil conjugate position R of the projection optical system 30 coincide with each other. In this embodiment, the pupil position P of the eye E to be inspected and the pupil conjugate of the projection optical system 30 are used by using the working distance from the apex position K of the cornea of the eye E to be examined to the presentation window 3 of the subjective optometry device 1. A configuration in which the positions R are matched will be described as an example.

For example, when the eye E to be inspected is displaced in the Z direction and is not located at an appropriate working distance, the image interval from the index image Ma to Me at infinity hardly changes, but the index image Mh to Mf at finite distance. The image spacing changes. For example, the control unit 70 compares the image ratio (that is, a / b) between the image spacing a of the index images Ma and Me at infinity and the image spacing b of the index images Mh and Mf at finite distance. It is possible to obtain the change in the working distance from the corneal apex position K of the eye to be inspected E to the presentation window 3 of the subjective optometry device 1. For example, the amount of change in the working distance coincides with the distance Δg (see FIG. 9) in which the corneal apex position K of the eye E to be inspected is displaced in the Z direction. For details of the above configuration, refer to JP-A-6-46999.

In this embodiment, the configuration in which the index images of finite distance and infinity are used to specify the apex position K of the cornea in the eye E to be inspected has been described as an example, but the present invention is not limited to this. For example, the corneal apex position K of the eye E to be inspected may be specified from the anterior segment image of the subject imaged by the anterior segment imaging optical system 100 without using such an index image.

FIG. 9 is a diagram for explaining the pupil conjugate position R in the measuring means 7. For example, FIG. 9A shows a case where there is no positional deviation between the eye E to be inspected and the measuring means 7. For example, FIG. 9B shows a case where the eye E to be inspected is displaced in the Z direction with respect to the measuring means 7. For example, FIG. 9C shows a case where the measuring means 7 is moved and aligned when the eye E to be inspected is displaced in the Z direction with respect to the measuring means 7. In FIG. 9, for convenience of explanation, a simplified diagram is used in which the eye E to be inspected, the presentation window 3, the concave mirror 85, and the measuring means 7 are arranged in a straight line.

For example, the presentation window 3 and the concave mirror 85 are fixedly arranged in the subjective optometry device 1. For example, when performing measurement, the pupil position P of the eye to be inspected E and the pupil conjugate position R (the position that limits the width of the luminous flux diameter of the optotype in the projection optical system, that is, the position outside the subjective optometry device 1). In this embodiment, the pupil conjugate position R) on the subject side of the objective lens 14 is aligned. In this embodiment, for example, the first index projection optical system 45 and the second index projection optical system 46 are used to detect the working distance and adjust the alignment. For example, the first index projection optical system 45 and the second index projection optical system 46 are used to complete the alignment, so that the pupil position P of the eye to be inspected E and the outside of the subjective eye examination device 1 are present. The pupil conjugate position R is aligned.

For example, in this embodiment, the pupil conjugate position R is moved in the Z direction by moving the measuring means 7 in the Z direction by changing the positional relationship between the eye to be inspected E and the measuring means 7, and the eye to be inspected. The pupil position P and the pupil conjugate position R can be aligned. Further, in this case, another optical member (for example, a deflection mirror 81) in the subjective optometry device 1 may be moved together with the measuring means 7. For example, the other optical member may be configured to move integrally with the measuring means 7. Further, for example, the other optical member and the measuring means 7 may be separately moved.

In this embodiment, the first index projection optical system 45 and the second index projection optical system 46 are used to detect the working distance between the eye E to be inspected and the presentation window 3 and adjust the alignment state. Is not limited to this. For example, the detected working distance may be the working distance between the eye to be inspected and another member of the subjective optometry device 1. For example, the detected working distance may be the working distance between the eye to be inspected E and the measuring means 7. For example, the detected working distance may be the working distance between the eye E to be inspected and the deflection mirror 81.

In this embodiment, for example, the amount of deviation in the operating distance between the eye to be inspected E and the presentation window 3 coincides with the amount of deviation between the pupil position P of the eye to be inspected E and the pupil conjugate position R of the projection optical system 30. In this embodiment, "match" includes substantially "match". In this embodiment, the working distance between the eye to be inspected E and the presentation window 3 is set as the distance from the corneal apex position K of the eye to be inspected E to the presentation window 3.
For example, since the pupil position P of the eye E to be inspected is located behind the apex position K of the cornea by a predetermined distance (for example, 3 mm), the apex position K of the cornea of the eye E to be inspected is detected. Therefore, the pupil position P can be detected.

For example, the amount of change (deviation amount) in the working distance from the corneal apex position K of the eye to be inspected E to the presentation window 3 of the subjective optometry device 1 is the distance Δg (deviation amount) in which the corneal apex position K of the eye to be inspected E is displaced in the Z direction. (See FIG. 9). For example, the amount of deviation of the working distance from the corneal apex position K of the eye to be inspected E to the presentation window 3 of the subjective optometry device 1 can be indicated by G1-G (see FIGS. 9 (a) and 9 (b)). ). That is, for example, the amount of deviation of the working distance (G1-G) coincides with the distance Δg in which the corneal apex position K of the eye E to be inspected is displaced in the Z direction.

For example, since the pupil position P of the eye to be inspected E is located behind the corneal apex position K by a predetermined distance (for example, 3 mm), the amount of deviation of the corneal apex position K of the eye to be inspected E is large. Can be considered to coincide with the amount of deviation of the pupil position P. That is, when the distance of the corneal apex position K of the eye E to be examined deviated in the Z direction is the distance Δg, the distance of the pupil position P deviated in the Z direction is also Δg.

For example, in FIG. 9, the pupil conjugate position R of the light projecting optical system 30 is set to the position Z1, and the pupil position P of the eye to be inspected for emmetropia (the eye to be inspected having an optical power of 0D) is the pupil conjugate position. The position of the measuring means 7 when it matches R is set as the initial position T1. Further, for example, the working distance when the pupil position P of the eye to be inspected for emmetropia (the eye to be inspected having an optical power of 0D) coincides with the pupil conjugate position R is set as an appropriate working distance G for measurement. There is.

For example, the state shown in FIG. 9A is a state in which the eye E to be inspected is located at an appropriate working distance with respect to the presentation window 3 of the subjective eye examination device 1 (alignment completed state), and the position of the pupil of the eye to be inspected E. P and position Z1 match. Therefore, the pupil position P of the eye E to be inspected and the pupil conjugate position R coincide with each other, and the eye E to be inspected and the measuring means 7 have an optically conjugated positional relationship via the concave mirror 85. For example, in this embodiment, the pupil position P and the pupil conjugate position R are aligned in this way, so that the measurement can be started.

For example, when the subject puts his chin on the chin rest 5, the eye E to be examined is not located at an appropriate working distance, and the pupil position P of the eye E to be examined is in the anteroposterior direction (Z) with respect to the position Z1. It may be off in the direction). For example, in FIG. 9B, the pupil position P of the eye E to be inspected is shifted from the position Z1 to the position Z2 rearward by a distance Δg. In this state, the eye E to be inspected is not located at an appropriate working distance (alignment is not completed), and the pupil position P of the eye E to be inspected and the pupil conjugate position R do not match.

At this time, for example, the control unit 70 moves the measuring means 7 in the Z direction based on the working distance between the corneal apex position K of the eye E to be inspected and the presentation window 3, and adjusts the alignment state. That is, by moving the measuring means 7 in the Z direction, the position of the pupil conjugate position R is moved to the pupil position P of the eye E to be inspected. For example, the control unit 70 moves the measuring means 7 from the initial position T1 to the position T2 as shown in FIG. 9C.

For example, the control unit 70 detects the working distance G1 between the corneal apex position K of the eye E to be inspected and the presentation window 3, and moves the measuring means 7 based on the detected working distance G1. In this case, for example, the control unit 70 determines the amount of deviation between the detected operating distance G1 and the preset appropriate operating distance G (the amount of deviation when the pupil position P of the eye to be inspected E deviates from the position Z1 to the position Z2). The measuring means 7 is moved based on (consisting with Δg). As a result, the position of the pupil conjugate position R moves to the pupil position P of the eye E to be inspected. That is, the control unit 70 moves the measuring means 7 with respect to the eye to be inspected E in the optical axis direction by detecting the alignment state in the working distance direction (Z direction) with respect to the eye to be inspected E.

More specifically, for example, in the control unit 70, the distance Δg in which the eye E to be inspected deviates from the position Z1 to the position Z2 in the Z direction (the amount of change in the working distance from the corneal apex position K of the eye E to be inspected to the presentation window 3). The measuring means 7 is moved in the direction of the optical axis L4 based on the above (see FIG. 9). For example, in this embodiment, the distance from the pupil position P of the eye E to be examined to the pupil conjugate position R is changed by integrally moving the measuring means 7 with respect to the concave mirror 85 in the direction of the optical axis L4. be able to. As a result, the pupil conjugate position R in the projection optical system 30 moves in the optical axis L4 direction.

For example, the control unit 70 detects the alignment state in the Z direction (for example, the working distance) as described above, and adjusts the position of the measuring means 7 based on the alignment state (for example, the working distance) with respect to the eye E located at the position Z2. Therefore, the pupil conjugate position R can be arranged. That is, the eye E to be inspected located at the position Z2 and the measuring means 7 have an optically conjugate positional relationship, and the alignment of the measuring means 7 with respect to the eye E to be inspected is completed at the position Z2.

<Correction of target projection magnification due to misalignment (S2)>
Here, for example, when the position of the measuring means 7 is adjusted with respect to the eye E to be inspected, the projection magnification of the target projected on the eye E to be inspected changes because the pupil conjugate position R moves. Therefore, for example, the control unit 70 acquires the position information of the measuring means 7.

For example, as the position information of the measuring means 7, the moving amount of the measuring means 7 may be acquired, or the position coordinates of the measuring means 7 may be acquired. Further, for example, as the position information of the measuring means 7, the relative position information between the concave mirror 85 and the measuring means 7 may be acquired, or the relative position information between the eye E to be inspected and the measuring means 7 may be acquired. Good. For example, in this case, the control unit 70 acquires the relative positional relationship between the concave mirror 85 or the eye E to be inspected and the measuring means 7. For example, such relative position information may be acquired by the control unit 70 detecting the position of the concave mirror 85 or the eye E to be inspected and the position of the measuring means 7, respectively.

For example, the position information of the measuring means 7 may be configured to use the position information changed by adjusting the overall position of the measuring means 7. Further, for example, as the position information of the measuring means 7, the position information changed by adjusting the position of at least one member (for example, a lens, a display, etc.) of the projection optical system 30 included in the measuring means 7 is used. It may be configured.

For example, the control unit 70 may be configured to obtain the projection magnification of the target luminous flux projected on the eye E to be inspected by acquiring the position information of the measuring means 7. Hereinafter, changes in the projection magnification of the target luminous flux will be described. For example, the viewing angle α of the eye E to be inspected affects the change in the projection magnification of the target luminous flux. FIG. 10 is a diagram illustrating a viewing angle α of the eye E to be inspected.

For example, when the eye E to be inspected is gazing at the center of the optotype F (the portion indicated by the diagonal line) displayed on the display 31, both ends F'of the optotype F are reflected in the peripheral visual field of the eye E to be inspected. The optotype F has both ends in the vertical direction and the horizontal direction, respectively, but in this embodiment, for convenience, only both ends F'in the vertical direction of the optotype F will be illustrated and described. For example, the visual angle α of the eye E to be inspected is represented as an angle formed by two straight lines connecting the pupil position P in the eye E to be inspected and both ends F'of the optotype F. That is, the viewing angle α is expressed as an angle at which the eye E to be examined looks at the target F.

For example, the viewing angle α can be expressed by the following equation using the distance D from the pupil position P of the eye to be inspected E to the optotype F and the size h of the optotype F.

For example, from Equation 1, the shorter the distance D from the pupil position P of the eye E to be examined to the target F, the larger the viewing angle α. Further, the larger the viewing angle α, the larger the size h of the optotype F appears to the eye E to be inspected. On the other hand, the longer the distance D from the pupil position P of the eye E to be inspected to the target F, the smaller the viewing angle α. Further, the smaller the viewing angle α, the smaller the size h of the optotype F appears to the eye E to be inspected. If the viewing angles α are the same, even if the distance D from the pupil position P of the eye to be inspected E to the optotype F is different, the optotype F appears to be the same size in the eye to be inspected E.

For example, the visual angle α of the eye E to be inspected changes depending on the alignment state of the measuring means 7 with respect to the eye E to be inspected. That is, the size of the viewing angle α changes when the position of the measuring means 7 is adjusted with respect to the concave mirror 85 and the pupil conjugate position R moves.

For example, FIG. 11 is a diagram illustrating a change in the viewing angle α due to alignment. FIG. 11A shows a state in which the eye E to be inspected is in position Z1 (see FIG. 8). FIG. 11B shows a state in which the eye E to be inspected is in the position Z2 behind the position Z1 (that is, in the direction away from the concave mirror 85). FIG. 11C shows a state in which the eye E to be inspected is in the position Z3 in front of the position Z1 (that is, in the direction approaching the concave mirror 85). In FIG. 11, for convenience of explanation, the deflection mirror 81 is omitted, and the objective lens 14, the projection lens 33, and the projection lens 34 included in the measuring means 7 are replaced with one convex lens CL. Further, since the concave mirror 85 in this embodiment can be similarly considered with a convex lens, the concave mirror 85 will be replaced with the convex lens M in FIG. For example, in FIG. 11, the eye to be inspected may be located anywhere in position Z1 (FIG. 11 (a)), position Z2 (FIG. 11 (b)), or position Z3 (FIG. 11 (c)). It is assumed that the position of the measuring means 7 is adjusted with respect to E, and the pupil position P and the pupil conjugate position R of the eye E to be inspected are aligned.

For example, in FIG. 11, the target luminous flux from the display 31 is emitted in parallel. That is, the luminous flux emitted from the display 31 advances in parallel to the position of the convex lens CL. For example, the luminous flux is refracted by the convex lens CL, then refracted by the concave mirror 85 (convex lens M in FIG. 11), which is further fixedly arranged, and is incident on the eye E to be inspected. Therefore, substantially, the position of the convex lens M can be considered as the position where the display 31 is arranged. That is, the distance D (see FIG. 10) from the pupil position P of the eye to be inspected E to the optotype F can be considered as the distance from the pupil position P of the eye to be inspected E to the convex lens M.

For example, as shown in FIG. 11A, the specular luminous flux from both ends F'of the optotype F is incident on the pupil position P of the eye E to be inspected via the convex lens CL and the convex lens M. For example, in this state, the distance from the pupil position P to the optotype F (the distance from the pupil position P to the convex lens M) is the distance D1. Further, for example, the visual angle α1 of the eye E to be inspected is represented by the angle formed by the pupil position P of the eye E to be inspected and the luminous flux refracted by the convex lens M.

For example, in a state where the eye E to be inspected is located at the position Z2 or Z3, when the measuring means 7 moves to match the pupil conjugate position R with the pupil position P of the eye E to be inspected, the eye E to be inspected is displayed on the display 31. The viewing angle α for viewing the optotype F to be performed changes.

For example, as shown in FIG. 11B, when the eye E to be inspected is located at the position Z2 behind the position Z1, the distance D2 from the pupil position P of the eye to be inspected E to the convex lens M is longer than the distance D1. Become. Therefore, the viewing angle α2 in which the eye to be inspected E sees the target F through the convex lens M and the convex lens CL is narrower (smaller) than the visual angle α1 in the state where the eye to be inspected E is in the position Z1. For example, at this time, since the viewing angle α1 of the eye to be inspected E> the viewing angle α2, when the eye to be inspected E sees the optotype F from the position Z2 as compared with the case where the eye to be inspected E sees the optotype F from the position Z1. , The size h of the optotype F seems to be small.

Further, for example, as shown in FIG. 11C, when the eye to be inspected E is located at the position Z3 in front of the position Z1, the distance D3 from the pupil position P of the eye to be inspected E to the convex lens M is from the distance D1. Will also be shorter. Therefore, the viewing angle α3 in which the eye to be inspected E sees the target F through the convex lens M and the convex lens CL is wider (larger) than the viewing angle α1 in the state where the eye to be inspected E is in the predetermined position Z1. For example, at this time, since the viewing angle α1 of the eye to be inspected E <the viewing angle α3, the eye to be inspected E sees the optotype F from the measurement position Z3 as compared with the case where the eye to be inspected E looks at the target F from the specified position Z1. In this case, the size h of the optotype F seems to be large.

For example, as described above, when the eye E to be inspected is deviated from the position Z1, the size of the visual angle α changes as the alignment in the Z direction with respect to the eye E to be inspected is completed. Therefore, the projection magnification of the target luminous flux projected from the target F toward the test eye E does not match the state in which the target eye E is in the position Z1 and the state in which the target eye E is in the position Z2 or the position Z3. For example, when the control unit 70 detects that the pupil position P of the eye E to be inspected is deviated from the position Z1 (the measuring means 7 is moving from the initial position T1), the control unit 70 performs alignment in the Z direction. At the same time, the projection magnification of the target luminous flux projected on the eye E to be inspected is corrected.

For example, the control unit 70 sets a correction amount for correcting the projection magnification of the target luminous flux projected on the eye E to be inspected based on the relative position information of the concave mirror 85 and the measuring means 7. For example, the relative position information between the concave mirror 85 and the measuring means 7 may be calculated from the distance Δg in which the eye E to be inspected deviates from the position Z1 in the Z direction. For example, when the alignment is performed in the Z direction, the measuring means 7 is moved with respect to the concave mirror 85 based on the distance Δg (see FIG. 9) in which the eye E to be inspected deviates from the position Z1 in the Z direction. That is, the relative position information between the concave mirror 85 and the measuring means 7 can be acquired based on the distance Δg.

For example, the memory 75 has a correction table for converting into a correction amount for correcting the projection magnification of the target luminous flux projected on the eye E to be inspected based on the relative position information of the concave mirror 85 and the measuring means 7. It is remembered. For example, such a correction table may be set by conducting an experiment or a simulation in advance. For example, after acquiring the relative position information between the concave mirror 85 and the measuring means 7, the control unit 70 acquires a correction amount for correcting the projection magnification of the target luminous flux from this correction table. For example, the correction amount is set so that the projection magnification of the target luminous flux projected on the eye E to be inspected is 1.0. For example, the subjective optometry device 1 in the present embodiment projects the measuring means 7 onto the eye to be inspected E when the measuring means 7 is located at the initial position T1 (when the pupil conjugate position R is located at the position Z1). The projection magnification of the optometric luminous flux is set to 1.0.

For example, in the following, a state in which the eye E to be inspected is 10 mm behind the position Z1 will be described as an example. For example, the control unit 70 detects the distance Δg in which the eye E to be inspected deviates from the position Z1 by using the index images Ma to Mh described above. For example, this detects that the distance Δg is 10 mm. Next, the control unit 70 performs alignment in the Z direction with respect to the eye E to be inspected, moves the pupil conjugate position R of the measuring means 7, and makes the pupil conjugate position R coincide with the pupil position P of the eye E to be inspected. For example, at this time, the measuring means 7 is moved by 10 mm with respect to the concave mirror 85, so that the alignment in the Z direction (alignment of the pupil conjugate position R and the pupil position P) is completed.

For example, when the alignment is completed, the control unit 70 acquires 10 mm as relative position information (for example, the amount of movement of the measuring means 7) between the concave mirror 85 and the measuring means 7. For example, the control unit 70 sets the correction amount of the projection magnification based on the relative position information of the concave mirror 85 and the measuring means 7. For example, as for the projection magnification of the target luminous flux, a correction amount for setting the projection magnification of the target luminous flux to 1.0 is stored as a correction table according to the relative position information of the concave mirror 85 and the measuring means 7. For example, the reciprocal of the projection magnification may be set as such a correction amount. For example, when the distance Δg is 10 mm behind the position Z1 (the state in which the measuring means 7 is moved 10 mm behind), the projection magnification of the target luminous flux is 0.975, so that the correction amount is about 1. Obtained as 026. For example, by using the correction table, the control unit 70 can acquire a correction amount for correcting the projection magnification of the target luminous flux from the relative position information of the concave mirror 85 and the measuring means 7, and set this.

Next, the control unit 70 corrects the projection magnification of the target luminous flux based on the above correction amount. For example, the control unit 70 changes the size of the optotype F displayed on the display 31 based on the set correction amount in order to project the optotype luminous flux onto the eye E to be inspected at a projection magnification of 1.0. For example, the control unit 70 in this embodiment can change the size of the optotype F by changing the number of pixels of the optotype F displayed on the display 31.

For example, when the eye E to be inspected is located at the position Z1, the luminous flux is projected onto the eye E to be inspected so that the projection magnification of the optotype F is 1.0. For example, at this time, a 100-pixel optotype F is displayed on the display 31. For example, when the eye E to be inspected is deviated from the position Z1 in the Z direction and the correction amount is set to 1.026, the control unit 70 multiplies the size of the optotype F by 1.026, and the optotype of about 103 pixels. F is displayed on the display 31. For example, by controlling the display of the display 31 in this way, the control unit 70 corrects the projection magnification of the target luminous flux projected toward the eye E to be inspected to 1.0.

For example, after the Z direction of the eye to be inspected E is aligned as described above and the projection magnification of the target luminous flux projected on the eye to be inspected E is corrected, the subjective measurement of the eye to be inspected E using the subjective measurement optical system is performed. Is started.

<Correction of optotype projection magnification based on the distance between the refractive power of the eye to be inspected and the conjugated position of the pupil (S3)>
For example, the display 31 included in the projection optical system 30 projects an uncorrected target luminous flux (0D target luminous flux) on the eye E to be inspected when the measuring means 7 is arranged at the initial position T1. It is placed in the standby position. That is, for example, the standby position of the display 31 is the combined focal position f of the objective lens 14, the projection lens 33, and the projection lens 34 with respect to the eye E to be inspected having an optical power of 0D (see FIG. 12).

For example, when the subjective measurement is started, as described above, by using the objective refractive power of the eye, the correction optical system 60 is controlled according to the refractive power of the eye to be examined. For example, the control unit 70 is based on at least one of objectively measured refractive powers such as spherical refraction S, columnar refraction C, astigmatic axis angle A, and prism amount Δ of the eye E to be inspected. , The display 31 is moved in the direction of the optical axis L2 and placed at the initial position e (see FIG. 12) at the time of subjective measurement.

For example, the initial position e of the display 31 changes depending on the refractive power of the eye to be inspected E. That is, for the eye E to be inspected whose refractive power is not 0D, the display 31 moves from the standby position to the initial position e different from the standby position. For example, for the eye E to be inspected having an optical power of 0D, the display 31 does not move from the standby position, and the standby position is set as the initial position e. For example, this allows the control unit 70 to acquire the correction power of the correction optical system 60. That is, the control unit 70 can acquire the correction power for correcting the eye E to be inspected to have an optical power of 0D from the arrangement position of the display 31.

For example, when the position of the display 31 is moved, the subjective measurement is started. For example, after the subjective measurement is started, the eye E to be inspected cannot keep the target in a fixed state during the subjective measurement, and may cause slight movements to cause a fixed vision shift. In addition, the position of the subject's face may move, causing a shift in fixation.

For example, in this case, the projection magnification of the target luminous flux may change. For example, the display 31 is in the initial position e different from the standby position (when the eye to be inspected is not the eye to be inspected having a refractive power of 0D), and the eye to be inspected E is in the position where the alignment is completed (for example, the position Z2 in FIG. 9). ) To a slight movement in the anteroposterior direction (Z direction) (the pupil position P of the eye E to be inspected and the pupil conjugate position R of the projection optical system 30 deviate from each other), the viewing angle α at which the eye E to be inspected looks at the optotype F changes. .. As a result, the projection magnification of the target luminous flux projected on the eye E to be inspected changes. For example, when the display 31 is in the standby position (when the eye to be inspected is an eye to be inspected having a refractive power of 0D) and the eye to be inspected E slightly moves in the anteroposterior direction (Z direction) from the position where the alignment is completed. , The viewing angle α does not change.

Hereinafter, the relationship between the distance between the eye to be inspected E and the pupil conjugate position R, the refractive power of the eye to be inspected E, and the visual angle α will be described. For example, FIG. 12 is a diagram illustrating a change in the visual angle α according to the refractive power of the eye E to be inspected. FIG. 12A shows a case where the refractive power of the eye to be inspected E is 0D. FIG. 12B shows a case where the refractive power of the eye in the eye E to be inspected is not 0D. For example, in this embodiment, the case where the eye refraction force is not 0D and the case where the eye E to be inspected is a myopic eye (for example, the case where the eye refraction force is −10D) is given as an example. For example, in FIG. 12, for convenience, the objective lens 14, the projection lens 33, and the projection lens 34 included in the measuring means 7 will be replaced with one convex lens CL.

For example, in the case of the eye to be inspected E1 having an optical power of 0D (that is, the state shown in FIG. 12A), the display 31 is arranged in the standby position. That is, the display 31 is arranged at the combined focal position f of the objective lens 14, the projecting lens 33, and the projecting lens 34 (the focal position f of the convex lens CL in FIG. 12).

For example, the display 31 emits the target luminous flux in various directions. For example, when the eye to be inspected E1 is at the position Z2 (the position where the alignment is completed (the position where the pupil position P and the pupil conjugate position R match)), the eye to be inspected E1 is irradiated from both ends F'of the optotype F in parallel. The target luminous fluxes r1 and r2 are refracted by the convex lens CL to be incident. At this time, the viewing angle α of the eye to be inspected E1 located at the position Z2 can be expressed as an angle formed by the pupil position P of the eye to be inspected E and the target luminous fluxes r1 and r2.

For example, when the eye to be inspected E1 is at the position S (hereinafter, the fine movement position S) that is finely moved in the Z direction, the luminous flux incident on the pupil position P of the eye to be inspected E1 changes. For example, the parallel target luminous fluxes r1 and r2 emitted from the display 31 do not incident on the pupil position P of the eye E1 to be inspected at the fine movement position S. For example, in this state, among the optotype light fluxes emitted from the display 31 in various directions, the optotype light fluxes r3 and r4 are refracted by the convex lens CL, so that they are incident on the pupil position P of the eye E1 to be inspected. At this time, the viewing angle α'of the eye E1 to be inspected at the fine movement position S can be expressed as an angle formed by the pupil position P of the eye E to be inspected and the target luminous fluxes r3 and r4.

For example, since the optotype luminous flux r1 and the optotype luminous flux r3 have the same focal position f with respect to the convex lens CL, they are the optotype luminous flux incident on the eye E to be inspected at an angle parallel to each other through the convex lens CL. Similarly, for example, since the optotype luminous flux r2 and the optotype luminous flux r4 have the same focal position f with respect to the convex lens CL, they are the optotype luminous flux incident on the eye E to be inspected at an angle parallel to each other through the convex lens CL. Therefore, the visual angle α and the visual angle α'of the eye E1 to be inspected are equal to each other. That is, in the eye to be inspected E1 having an optical power of 0D, the display 31 is arranged in the standby position, and even if the eye to be inspected E1 moves slightly in the Z direction from the position Z2, the luminous flux projected onto the eye to be inspected E1 is The projection magnification does not change.

For example, in the case of the eye to be inspected E2, which is a myopic eye (that is, the state shown in FIG. 12B), the display 31 is arranged at an initial position e different from the standby position. That is, since the eye E2 to be inspected focuses on the front side of the eye E1 to be inspected of 0D, the display 31 is arranged on the front side of the focal position f of the convex lens CL according to the refractive power of the eye E2 to be inspected.

For example, when the eye to be inspected E1 is at the position Z2 (the position where the alignment is completed (the position where the pupil position P and the pupil conjugate position R match)), the eye to be inspected E2 is irradiated from both ends F'of the optotype F in parallel. The target luminous fluxes r1 and r2 are refracted by the convex lens CL to be incident. At this time, the viewing angle α of the eye to be inspected E2 located at the measurement position Z2 can be expressed as an angle formed by the pupil position P of the eye to be inspected E and the target luminous fluxes r1 and r2.

For example, when the eye to be inspected E2 is in the fine movement position S, the luminous flux incident on the pupil position P of the eye to be inspected E2 changes. For example, the parallel target luminous fluxes r1 and r2 emitted from the display 31 are not incident on the pupil position P of the eye E2 to be inspected at the fine movement position S. For example, in this state, among the target luminous fluxes radiated from the display 31 in various directions, the target luminous fluxes r5 and r6 are refracted by the convex lens CL, so that they are incident on the pupil position P of the eye E2 to be inspected. For example, with respect to the eye E2 to be inspected, since the arrangement position of the display 31 is closer than the focal position f with respect to the convex lens CL, the luminous fluxes r5 and r6 become diffused luminous fluxes and enter the eye E2 to be inspected. .. At this time, the viewing angle α'of the eye E2 to be inspected at the fine movement position S can be expressed as an angle formed by the pupil position P of the eye E to be inspected and the target luminous fluxes r5 and r6.

For example, since the luminous fluxes r5 and r6 are diffused luminous fluxes, the luminous flux r1 and the luminous flux r5 are different from the luminous fluxes incident on the eye E to be inspected at angles parallel to each other through the convex lens CL. It doesn't become. Similarly, since the luminous fluxes r5 and r6 are diffused luminous fluxes, the luminous flux r2 and the luminous flux r6 are the luminous fluxes incident on the eye E to be inspected at an angle parallel to each other via the convex lens CL. Must not be. For example, in the eye E2 to be inspected, which is a myopic eye, the size of the visual angle α'changes with respect to the visual angle α. That is, in the eye to be inspected E2, which is a myopic eye, when the eye to be inspected E1 moves slightly in the Z direction from the position Z2, the projection magnification of the target luminous flux projected on the eye to be inspected E2 changes. The magnitude of such a viewing angle α'changes as the absolute value of the refractive power of the eye to be inspected E increases. Therefore, when the eye E to be inspected having a large absolute value of the optical power of refraction makes a slight movement, the projection magnification of the target light beam is increased as compared with the case where the eye to be inspected E having a small absolute value of the optical power of refraction makes a slight movement. Need to be corrected.

Hereinafter, correction of the projection magnification of the target luminous flux based on the distance between the eye to be inspected E and the pupil conjugate position R and the correction power of the correction optical system 60 based on the optical refractive power of the eye to be inspected E will be described. For example, in this embodiment, the control unit 70 detects the distance between the eye E to be inspected (in this embodiment, the pupil position P of the eye E to be inspected) and the pupil conjugate position R of the projection optical system 30. In this embodiment, for example, the distance between the eye E to be inspected and the pupil conjugate position R of the projection optical system 30 may be obtained from the amount of change in the working distance. That is, the distance between the eye to be inspected E and the pupil conjugate position R of the projection optical system 30 can be obtained by detecting the alignment state.

For example, the control unit 70 corrects the projection magnification of the target luminous flux projected on the eye to be inspected based on the detection result and the correction power of the correction optical system 60 based on the refractive power of the eye to be inspected E. Set the correction amount of. That is, for example, the control unit 70 corrects the projection magnification of the target luminous flux projected on the eye to be inspected based on the detection result and the position of the display 31 moved based on the refractive power of the eye to be inspected E. Set the correction amount for. For example, the control unit 70 corrects the projection magnification of the target luminous flux based on the set correction amount.

For example, the distance between the eye to be inspected E and the pupil conjugate position R of the projection optical system 30 is detected by detecting the alignment state in the working distance direction (Z direction) of the eye to be inspected E. For example, the control unit 70 detects the alignment state of the eye E to be inspected in the working distance direction (Z direction). The alignment state compares the image ratio (that is, a / b) between the image spacing a of the index images Ma and Me at infinity and the image spacing b of the index images Mh and Mf at finite distance as described above. It can be judged by this (see FIG. 8). For example, the control unit 70 detects the distance Δd from the position Z2 (alignment completion position) of the eye E to be examined to the fine movement position S in which the eye E is slightly moved in the Z direction. That is, the control unit 70 determines the distance Δd as the distance between the eye to be inspected E and the pupil conjugate position R of the projection optical system 30 from the amount of change in the operating distance from the eye to be inspected E to the presentation window 3 (the amount of misalignment). Can be obtained.

For example, when the control unit 70 detects the distance between the eye to be inspected E and the pupil conjugate position R of the projection optical system 30, the control unit 70 determines the eye to be inspected E based on the detection result and the correction power of the correction optical system 60. Set the correction amount for correcting the projection magnification of the projected target luminous flux. For example, the memory 75 included in the control unit 70 stores a correction table for converting into a correction amount for correcting the projection magnification of the target luminous flux projected on the eye E to be inspected based on the correction power and the distance Δd. Has been done. For example, such a correction table may be preset for each correction frequency and distance Δd by performing an experiment or a simulation. For example, the control unit 70 acquires a correction amount corresponding to the correction frequency and the distance Δd based on the correction table. For example, the correction amount is set so that the projection magnification of the target luminous flux projected on the eye E to be inspected is 1.0.

For example, when the control unit 70 acquires a correction amount such that the projection magnification of the target luminous flux projected on the eye E to be examined is 1.0, the size of the target F is changed by changing the number of pixels as described above. To adjust. As a result, the control unit 70 can correct the projection magnification of the target luminous flux projected toward the eye E to be inspected to 1.0.

As described above, for example, the subjective optometry apparatus in the present embodiment is a detection means for detecting the distance between the acquisition means for acquiring the correction power of the correction optical system and the pupil conjugate position of the eye to be inspected and the light projection optical system. A correction amount setting means for setting a correction amount for correcting the projection magnification of the target luminous flux projected on the eye to be inspected, and a correction means for correcting the projection magnification of the target luminous flux are provided. As a result, the examiner can subjectively measure the optical characteristics of the eye to be inspected by suppressing the deviation of the eye to be inspected from the conjugated position of the pupil and the change in the size of the optotype caused by the refractive power of the eye to be inspected. can do. Therefore, the examiner can perform the subjective measurement with high accuracy.

Further, for example, when the position of the eye to be inspected is moved and it is difficult to align the pupil-conjugated position of the projection optical system with respect to the eye to be inspected, when the eye to be inspected is aligned with the pupil-conjugated position. The optotype can be presented in the same size as the optotype that can be observed. As a result, when the position of the eye to be examined is displaced, the size of the optotype is changed, and it is possible to prevent the subject from having difficulty in observing the optotype. That is, the examiner can perform the subjective measurement with high accuracy.

Further, for example, the subjective optometry device in the present embodiment includes a measurement unit that houses a light projection optical system, an acquisition means for acquiring position information of the measurement unit, and a projection magnification of the target luminous flux projected on the eye to be inspected. It is provided with a correction amount setting means for setting a correction amount for correcting the above and a correction means for correcting the projection magnification of the target luminous flux. As a result, in a subjective optometry device having a fixed optical member, when the deviation between the eye to be inspected and the pupil conjugate position of the light projection optical system is adjusted, the projection magnification of the optotype projected on the eye to be inspected changes. Even so, the examiner can project an optotype of the same size on the eye to be examined. Therefore, it is possible to accurately measure the awareness of the eye to be inspected.

Further, for example, the subjective optometry device in the present embodiment is a measuring unit in the optical axis direction based on a detecting means for detecting the distance between the eye to be inspected and the pupil conjugate position of the light projection optical system and the detection result by the detecting means. It is provided with an adjusting means for adjusting the position of. As a result, when the position of the eye to be inspected is deviated, the distance between the fixed optical member and the measurement unit is automatically adjusted so that the pupil conjugate position of the projection optical system matches the eye to be inspected. .. Therefore, the examiner can easily align the measuring unit with respect to the eye to be inspected.

Further, for example, the subjective optometry apparatus in this embodiment changes the size of the optotype displayed on the display based on the set correction amount. This allows the examiner to easily correct the projection magnification of the target luminous flux.

Further, for example, the subjective optometry apparatus in the present embodiment includes an optical member that can move in the optical path of the projection optical system and a driving means that moves the optical member in the optical path of the projection optical system. Further, for example, the subjective optometry apparatus in this embodiment can move the optical member based on the correction amount. Therefore, the examiner can accurately correct the projection magnification of the target luminous flux by arranging the optical member at an appropriate position with respect to the eye to be inspected.

Further, for example, the subjective optometry apparatus in the present embodiment can optically present an optotype at a predetermined inspection distance by the subjective inspection means by using a concave mirror, and can be viewed at a predetermined inspection distance. When presenting the mark, it is not necessary to arrange the members or the like so as to be the actual distance. As a result, extra members and space are not required, and the device can be miniaturized.

<Example of transformation>
In this embodiment, a configuration in which the control unit 70 automatically aligns the eye E to be inspected with the measuring means 7 has been described as an example, but the present invention is not limited to this. For example, the alignment of the eye E to be inspected and the measuring means 7 may be manually performed by the examiner. For example, in this case, a configuration is provided in which the measuring means 7 can be manually moved.

In this embodiment, the correction amount is set so that the projection magnification of the target luminous flux is 1.0, but the correction amount is not limited to this. Of course, the projection magnification of the target luminous flux may be set to be other than 1.0. For example, even in such a case, the projection magnification of the target luminous flux with respect to the eye E to be inspected can be corrected in the same manner as described above.

In this embodiment, a configuration in which the correction amount is set so that the projection magnification of the target luminous flux is 1.0 has been described as an example, but the present invention is not limited to this. For example, the correction amount may be set as the value of the viewing angle α of the target luminous flux projected toward the eye E to be inspected. For example, in this case, the correction amount is set so that the viewing angle α that changes due to the movement of the eye E to be examined in the Z direction matches the viewing angle α that the eye E to be examined sees the target F at the position Z1. It may be configured.

In this embodiment, a configuration in which the projection magnification of the luminous flux of the optotype projected on the eye E to be examined is corrected by changing the size of the optotype F displayed on the display 31 has been described as an example. Not limited to. For example, in this embodiment, the optical distance may be changed and the projection magnification of the target luminous flux may be corrected by moving the optical member based on the set correction amount. For example, in this case, the optical member included in the projection optical system 30 may be used, or the optical member may be provided separately.

For example, when the projection magnification of the target luminous flux is corrected by using the optical member included in the light projecting optical system 30, the optical member is used as the light of the light projecting optical system 30 based on the correction amount set by the control unit 70. It may be moved in the axial direction. For example, as the optical member, the light projecting lens 33 or the light projecting lens 34 may be moved in the direction of the optical axis L2. Further, for example, as the optical member, the objective lens 14 may be moved in the optical axis L3 direction. For example, when either of these projection lenses or objective lenses is moved in the optical axis direction, the position of the correction optical system 60 arranged according to the optical refractive power of the eye E to be inspected changes, so that the display 31 is moved to the optical axis. It is necessary to move in the L2 direction. That is, since the focus of the optotype F displayed on the display 31 shifts with respect to the eye E to be inspected due to the movement of either the projection lens or the objective lens, it is necessary to move the display 31 to the focal position. For example, the control unit 70 projects the target luminous flux by moving either the projection lens or the objective lens in the optical axis direction and the display 31 in the optical axis direction based on the set correction amount. The magnification may be corrected.

For example, when a plurality of these projection lenses or objective lenses are configured to be moved in the optical axis direction, they are displayed on the display 31 with respect to the eye E to be inspected even if the arrangement of the correction optical system 60 is changed. The target can be kept in focus. For example, the control unit 70 may correct the projection magnification of the target luminous flux by moving a plurality of projection lenses or objective lenses in the optical axis direction based on a set correction amount.

For example, as described above, the subjective optometry apparatus in the present embodiment can control the driving means based on the correction amount and move the optical member in the optical axis direction of the projection optical system. Therefore, the examiner can change the optical distance from the display 31 to the eye E to be inspected with a simple configuration and correct the projection magnification of the target luminous flux.

Further, for example, when the projection magnification of the target luminous flux is corrected by separately providing the optical member, the optical member may be inserted or removed from the optical axis of the projection optical system 30 based on the set correction amount. Good. For example, the optical member may be inserted or removed anywhere as long as it is on the optical axis through which the target luminous flux projected from the display 31 toward the eye E to be inspected passes. In other words, the optical member may be inserted or removed anywhere on the optical axis L2 and the optical axis L3. For example, as such an optical member, a lens (for example, a convex lens or a concave lens), a prism, a mirror, or the like can be used. In the following description, a case where a lens is used as an optical member will be given as an example.

For example, in the case where one lens is inserted and removed on the optical axis L2 or the optical axis L3, one lens is provided for the correction optical system 60 arranged according to the optical refractive power of the eye E to be inspected. Since it is added, the optotype displayed on the display 31 is out of focus with respect to the eye E to be inspected. Therefore, for example, the control unit 70 adjusts the focal position of the optotype to the eye E to be inspected by inserting one lens based on the set correction amount and moving the display 31 in the optical axis direction. , The projection magnification of the optometric luminous flux may be corrected.

Further, for example, when the projection magnification of the target luminous flux is corrected by separately providing an optical member, a plurality of lenses may be inserted on the optical axis L2 and the optical axis L3. At this time, all of the plurality of lenses may be inserted on the optical axis L2, or all of the plurality of lenses may be inserted on the optical axis L3. Of course, one of the plurality of lenses may be inserted on the optical axis L2, and any lens may be inserted on the optical axis L3. For example, when a plurality of lenses are inserted in this way, the focal position of the optotype displayed on the display 31 does not change with respect to the eye E to be inspected. For example, the control unit 70 may correct the projection magnification of the target luminous flux by inserting a plurality of lenses based on the set correction amount. As the plurality of lenses, a convex lens may be used, a concave lens may be used for each, or a convex lens and a concave lens may be used in combination.

For example, as described above, the subjective optometry apparatus in the present embodiment can control the driving means based on the correction amount and insert / remove the optical member into the optical path of the light projecting optical system. Therefore, the examiner can change the optical distance from the display 31 to the eye E to be inspected and correct the projection magnification of the target luminous flux with a simple configuration.

In this embodiment, when the eye E to be inspected is deviated from the position Z1 in the Z direction, a configuration for correcting the projection magnification of the optotype projected on the eye E to be inspected has been described as an example, but the present invention is limited to this. Not done. For example, depending on the position where the eye E to be inspected deviates from the position Z1, the change in the projection magnification of the optotype is slight, so that the magnification may not need to be corrected. For example, at this time, an allowable range may be set for the misalignment. For example, such an allowable range may be calculated in advance by simulation, experiment, or the like. For example, after detecting that the eye E to be inspected deviates from the position Z1, the control unit 70 determines whether the deviation exceeds the permissible range or falls within the permissible range. For example, in this way, the control unit 70 may be configured not to correct the projection magnification of the target projected on the eye E to be inspected when the misalignment in the eye E to be inspected is within the permissible range.

Further, in the present embodiment, when the eye E to be inspected moves slightly during the subjective measurement, the configuration for correcting the projection magnification of the target projected on the eye E to be inspected has been described as an example, but the present invention is not limited to this. For example, depending on the position where the eye E to be inspected slightly moves and the refractive power of the eye to be inspected E, the change in the projection magnification of the optotype is small, so that the magnification may not need to be corrected. That is, when the fine movement of the eye E to be inspected is slight and the absolute value of the refractive power of the eye to be inspected E is small, it may not be necessary to correct the projection magnification of the optotype. For example, at this time, the permissible range may be set based on the deviation due to the slight movement of the eye E to be inspected and the refractive power of the eye E to be inspected. For example, such an allowable range may be calculated in advance by simulation, experiment, or the like. For example, when the control unit 70 performs subjective measurement on the eye E to be inspected having a small refractive power, and further detects a deviation due to slight movement of the eye E to be inspected, is the change in the projection magnification within an allowable range? Judge whether or not. For example, the control unit 70 may be configured to determine whether or not to correct the projection magnification of the target projected on the eye E to be inspected based on such a determination.

In this embodiment, the case where the eye E to be inspected moves slightly during the subjective measurement has been described as an example, but the eye E to be inspected may move significantly during the subjective measurement. For example, in such a case, depending on the refractive power of the eye to be inspected E or the deviation in the Z direction, the display range of the display may be exceeded when the display of the display 31 is controlled to correct the projection magnification of the target luminous flux. Sometimes. In other words, changing the size of the optotype F displayed on the display 31 may not correspond to the correction of the projection magnification. Therefore, when the eye E to be inspected moves significantly, the measuring means 7 may be realigned with respect to the eye E to be inspected, and the pupil conjugate position R may be rearranged at the pupil position P of the eye E to be inspected. For example, in this case, the control unit 70 detects the alignment deviation in the XYZ direction at any time even after the alignment with respect to the eye E to be inspected is completed, and the tracking control (tracking) that always detects the movement in the Z direction in the eye E to be inspected. There is a configuration to perform. For example, in this way, the alignment may be automatically performed with the movement of the eye E to be inspected, and the size of the optotype F displayed on the display 31 may always be corrected.

In this embodiment, a configuration for acquiring a correction amount for correcting the projection magnification of the target luminous flux due to misalignment using a correction table has been described as an example, but the present invention is not limited to this. For example, when the pupil position P of the eye to be inspected E and the pupil conjugate position R match by alignment and the distance Δg from the position Z1 to the position Z2 (alignment completion position) is detected, the control unit 70 uses an arithmetic expression. Therefore, the arithmetic processing for acquiring the correction amount for correcting the projection magnification of the target luminous flux from the distance Δg may be performed. For example, an arithmetic expression for performing such arithmetic processing may be set by performing an experiment or a simulation in advance and may be stored in a memory 75 included in the control unit 70. For example, as described above, the control unit 70 may be configured to acquire a correction amount for correcting the projection magnification of the target luminous flux due to the alignment deviation from the calculation formula.

Similarly, in the present embodiment, the configuration for acquiring the projection magnification of the target luminous flux due to the slight movement of the eye E to be inspected by using the correction table has been described as an example, but the present invention is not limited to this. For example, when the distance Δd from the position Z2 (alignment completion position) to the fine movement position S is detected, the control unit 70 uses an arithmetic expression to view from the distance Δd and the correction power of the correction optical system 60. An arithmetic process for acquiring a correction amount for correcting the projection magnification of the target luminous flux may be performed. For example, such an arithmetic expression may be set by performing an experiment or a simulation in advance and may be stored in the memory 75 included in the control unit 70. For example, as described above, the control unit 70 may be configured to set a correction amount for correcting the projection magnification of the target luminous flux due to the slight movement of the eye E to be inspected from the calculation formula.

In this embodiment, the configuration in which the optical refractive power of the eye to be inspected E is acquired by the objective measurement optical system included in the subjective eye examination device 1 has been described as an example, but the present invention is not limited to this. For example, the optical refractive power of the eye to be inspected E may be acquired by the subjective measurement optical system included in the subjective eye examination device 1. In this case, the correction power of the correction optical system 60 can be obtained by using the objective eye refractive power (objective value) as described in this embodiment, and the subjective eye refractive power acquired in the subjective measurement. It can also be obtained using (awareness value). For example, the consciousness value acquired during the consciousness measurement may be stored in the memory 75 at any time, and the control unit 70 may call the consciousness value when the eye E to be inspected slightly moves from the alignment completion position.

Further, in this embodiment, the configuration in which the optical refractive power of the eye to be inspected E is acquired by the objective measurement optical system included in the subjective eye examination device 1 has been described as an example, but the present invention is not limited to this. For example, as the refractive power of the eye to be inspected E, the objective value or the subjective value of the eye to be inspected E acquired by another device may be used. For example, in this case, there is a configuration in which the subjective optometry device 1 is provided with a receiving function for receiving an optical refractive power from another device. Further, for example, in this case, the examiner may input the optical refractive power of the eye E to be inspected.

In this embodiment, the subjective optometry device 1 including an optical system in which a concave mirror 85 is arranged as a fixed optical member has been described, but the present invention is not limited to this. For example, the subjective optometry device 1 in this embodiment may include an optical system in which a convex lens is fixedly arranged instead of the concave mirror 85. For example, even in an optical system in which a convex lens is fixedly arranged, the projection magnification of the target luminous flux changes, so that the projection magnification can be corrected in the same manner as in the present embodiment.

In this embodiment, a configuration in which the distance from the eye E to be examined to the pupil conjugate position R in the light projection optical system 30 is detected by detecting the operating distance (alignment state) of the eye E to be inspected is taken as an example. However, it is not limited to this. For example, the distance from the eye to be inspected E to the pupil conjugate position R may be determined by detecting the pupil position P of the eye to be inspected E. For example, in this case, the subjective optometry apparatus 1 may be provided with an imaging optical system for capturing a cross-sectional image of the eye E to be inspected. As a result, the pupil position P may be directly detected from the cross-sectional image of the eye E to be inspected, and the distance from the eye E to be inspected to the pupil conjugate position R in the projection optical system 30 may be obtained.

In this embodiment, the alignment in the working distance direction (Z direction) with respect to the eye E to be inspected has been described, but when the eye E to be inspected is deviated from the position Z1 in the X direction and the Y direction, the X direction and the Y direction are used. You may adjust the alignment in. For example, in this embodiment, the polarizing mirror 81 and the measuring means 7 can be integrally moved in the X direction to align the eye E to be inspected in the X direction (left-right direction). Further, for example, in this embodiment, the polarizing mirror 81 and the measuring means 7 can be integrally moved in the Z direction to align the eye E to be inspected in the Y direction (vertical direction).

Further, for example, when the eye E to be inspected slightly moves in the X direction and the Y direction from the alignment completion position (for example, the position Z2), the projection magnification of the target luminous flux in the X direction and the Y direction is taken into consideration. The size h of the optotype F may be changed.

In this embodiment, a configuration in which the deflection mirror 81 and the measuring means 7 are integrally driven to adjust the alignment in the XYZ directions has been described as an example, but the present invention is not limited to this. For example, in this embodiment, the positional relationship between the eye E to be inspected and the subjective measuring means and the objective measuring means may be adjusted by driving the deflection mirror 81 and the measuring means 7. That is, the configuration may be such that the XYZ directions can be adjusted so that the target luminous flux from the projection optical system 30 is formed on the fundus of the eye E to be inspected. For example, in this case, the subjective optometry device 1 may be provided with a configuration in which the subjective optometry device 1 can be moved in the XYZ direction with respect to the jaw base 5, and the subjective optometry device 1 may be moved. Further, for example, the deflection mirror 81 may be fixedly arranged and only the measuring means 7 may move. Further, for example, the configuration may be such that the adjustment in the XYZ direction can be performed only by the deflection mirror 81. In this case, for example, the deflection mirror 81 is rotationally driven and moves in the Z direction to change the distance between the deflection mirror 81 and the measuring means 7.

Although not described in this embodiment, the subject's face rotates in the horizontal direction plane (X direction plane), and the positions in the front-back direction (Z direction) are different between the left eye test EL and the right eye test ER. In this case, the above control operation may be performed on each of the left and right eye Es to be inspected. For example, as a result, the projection magnification of the optotype is corrected in each of the left eye subject EL and the right eye test eye ER, and an optotype of the same size can be projected on the left and right eye examinees E. Therefore, the examiner can obtain an accurate measurement result even when examining the binocular vision function of the eye E to be inspected.

1 Subjective optometry device 2 Housing 4 Monitor 5 Jaw pedestal 7 Measuring means 10 Objective measurement optical system 25 Subjective measurement optical system 30 Floodlight optical system 45 1st index projection optical system 46 2nd index projection optical system 50 Observation optics System 60 Corrective optical system 70 Control unit 75 Memory 81 Deflection mirror 84 Half mirror 85 Concave mirror 90 Corrective optical system 100 Anterior eye imaging optical system

Claims (5)

A projection optical system that projects the target luminous flux onto the eye to be inspected,
A fixed optical member that guides the image of the luminous flux to the eye to be inspected so as to optically have a predetermined inspection distance.
A correction optical system in the optical path of the light projection optical system that changes the optical characteristics of the eye to be inspected.
With
An optometry device that subjectively measures the optical characteristics of the eye to be inspected.
A measuring unit that houses the floodlight optical system and
A position information acquisition means for acquiring the position information of the measurement unit, and
A correction amount setting means for setting a correction amount for correcting the projection magnification of the target luminous flux projected on the eye to be inspected based on the position information.
A correction means for correcting the projection magnification of the target luminous flux based on the correction amount set by the correction amount setting means, and
A subjective optometry device characterized by being equipped with. In the subjective optometry device of claim 1,
A detection means for detecting the distance between the eye to be inspected and the pupil conjugate position of the projection optical system,
An adjusting means for adjusting the position of the measuring unit in the optical axis direction based on the detection result by the detecting means, and an adjusting means.
A subjective optometry device characterized by being equipped with. In the subjective optometry device of claim 1 or 2.
The projection optical system has a display, and when the optotype is displayed on the display, the optotype luminous flux is emitted.
The correction means is a subjective optometry device that corrects the projection magnification of the target luminous flux by changing the size of the target displayed on the display based on the correction amount. In the subjective optometry device of claim 1 or 2.
An optical member that can move in the optical path of the projection optical system and
A driving means for moving the optical member in the optical path of the projection optical system,
With
The correction means is a subjective optometry apparatus characterized in that the projection magnification of the target luminous flux is corrected by controlling the driving means and moving the optical member based on the correction amount. A projection optical system that projects an target light beam onto the eye to be inspected, a fixed optical member that guides the image of the target light beam to the eye to be inspected so as to optically have a predetermined inspection distance, and the light projection optical system. A subjective optometry program used in a optometry device for consciously measuring the optical characteristics of the optometry, which comprises a corrective optical system that changes the optical characteristics of the optometry in the optical path of the optometry. By being executed by the processor of the subjective optometry device,
A position information acquisition step for acquiring the position information of the measurement unit accommodating the projection optical system, and
A correction amount setting step for setting a correction amount for correcting the projection magnification of the target luminous flux projected on the eye to be inspected based on the position information, and a correction amount setting step.
A correction step for correcting the projection magnification of the target luminous flux based on the correction amount set by the correction amount setting step, and a correction step.
A subjective optometry program, characterized in that the subject is executed by the subjective optometry apparatus.