JP6951054B2 - Subjective optometry device - Google Patents

Description

The present disclosure relates to a subjective optometry apparatus that subjectively measures the optical characteristics of an eye to be inspected.

Conventionally, as a subjective optometry device, for example, an orthodontic optical system capable of adjusting the degree of refraction is individually arranged in front of the subject's eyes, and an examination target is projected onto the fundus of the eye to be inspected via the orthodontic optical system. Is known (see Patent Document 1). In response to the subject's response, the examiner adjusts the correction optical system until the target looks appropriate to the subject to obtain the correction value, and measures the refractive power of the subject's eye based on this correction value. .. Further, for example, as a subjective optometry device, an inspection target via a corrective optical system forms an image in front of the subject's eyes, and measures the refractive power of the subject's eye without arranging the corrective optical system in front of the eyes. Is known (Patent Document 2).

Japanese Unexamined Patent Publication No. 5-176893 U.S. Pat. No. 3,874774

By the way, when measuring the optical characteristics of the subject's eye, if a device in which a part of the device is arranged in front of the eye is used, the subject's eye is adjusted with respect to a part of the device arranged in front of the eye. May work and the measurement accuracy may decrease. Therefore, when measuring the optical characteristics of the subject's eye, the subject should be in a natural state (open state in which a part of the device is not placed in front of the eye) as if he / she is looking at something in daily life. , It is preferable to measure the optical characteristics by subjective measurement and the optical characteristics by objective measurement.

In view of the above problems, it is a technical subject of the present disclosure to provide a subjective optometry apparatus capable of performing subjective measurement and objective measurement under a natural state and capable of performing measurement with high accuracy.

In order to solve the above problems, the present invention is characterized by having the following configurations.
(1) The subjective eye examination device according to the first aspect of the present disclosure includes a light projection optical system that projects an optotype light beam from a display toward the eye to be inspected, a pair of left and right corrective optical systems for the right eye, and a left side. A correction optical system having an eye correction optical system and arranged in the optical path of the projection optical system to change the optical characteristics of the target light beam, and a right eye optical path including the right eye correction optical system. , A concave mirror shared by the left eye optical path including the left eye correction optical system, and the target light beam corrected by the correction optical system is reflected by the concave mirror in the direction to be inspected. A concave surface that guides the target light beam to the eye to be inspected and guides the image of the target light beam corrected by the correction optical system to the eye to be inspected optically at a predetermined inspection distance. A subjective eye examination device having a mirror and a subjective measurement means for subjectively measuring the optical characteristics of the eye to be inspected, from a measurement light source which is a light source different from the display to the fundus of the eye to be inspected. It has a pair of left and right measurement optical systems that emit measurement light and receive the reflected light by an imaging element, and the optical characteristics of the eye to be inspected are exhibited through the concave mirror arranged in the optical path of the measurement optical system. It is an objective measuring means for objectively measuring, and is provided with an objective measuring means for objectively measuring the optical refractive force of the eye to be inspected by analyzing the imaging result by the imaging element, and is the subjective measuring means. The subjective measurement by the measuring means and the objective measurement by the objective measuring means are performed in an open state without arranging the corrective optical system in front of the eyes of the subject.

It is an external view of the subjective optometry apparatus which concerns on this embodiment. 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 which concerns on this embodiment from the front direction. It is a schematic block diagram which looked at the inside of the subjective optometry apparatus which concerns on this Embodiment from the side direction. It is a schematic block diagram which looked at the inside of the subjective optometry apparatus which concerns on this embodiment from the upper surface direction. This is an example of presenting an optotype from a long distance. This is an example of presenting an optotype from a short distance. It is a figure explaining the change of the distance between optical axes by the movement of a deflection mirror. It is a figure which shows the anterior eye part observation screen which displayed the anterior eye part image imaged by the image pickup element. It is a figure explaining alignment control. It is a figure explaining the change of the alignment allowable range.

Hereinafter, one of the typical embodiments will be described with reference to FIGS. 1 to 11. In the following description, the depth direction of the subjective eye examination device 1 (the front-back direction of the subject when measuring the subject) is perpendicular to the Z direction and the depth direction (the subject when measuring the subject). The horizontal direction on the plane (horizontal direction of the examiner) will be described as the X direction, and the vertical direction (vertical direction of the subject when measuring the subject) will be described as the Y direction. It should be noted that R and L attached to the following reference numerals indicate those for the right eye and those for the left eye, respectively.

FIG. 1 is an external view of the optometry device 1 according to the present embodiment. The subjective optometry device 1 in the present embodiment includes a housing 2, a presentation window 3, an operation unit (monitor) 4, a jaw base 5, a base 6, an imaging optical system 100, and the like. For example, the housing 2 houses a member inside. For example, a measuring means (dotted line portion in FIG. 1) 7 is provided inside the housing 2 (details will be described later). For example, the measuring means 7 includes a right eye measuring means (right eye measuring means) 7R and a left eye measuring means (left eye measuring means) 7L. In the present embodiment, the right eye measuring means 7R and the left eye measuring means 7L are provided with the same member. That is, the optometry device 1 has a pair of left and right subjective measuring means and a pair of left and right objective measuring means. Of course, the right-eye measuring means 7R and the left-eye measuring means 7L may have at least a part different from each other.

For example, the presentation window 3 is used to present a target to the subject. For example, the luminous fluxes from the right-eye measuring means 7R and the left-eye measuring means 7L are projected onto the eye E to be inspected through the presentation window 3.

For example, the monitor (display) 4 is a touch panel. That is, in the present embodiment, the monitor 4 functions as an operation unit (controller). The monitor 4 outputs a signal corresponding to the input operation instruction to the control unit 70 described later. Of course, the monitor 4 and the operation unit may be provided separately. For example, the operation unit may be configured to use at least one of an operation means such as a mouse, a joystick, and a keyboard.

For example, the monitor 4 may be a display mounted on the main body of the subjective optometry device 1 or a display connected to the main body of the subjective optometry device 1. Of course, it does not have to be a touch panel type. For example, a display of a personal computer (hereinafter referred to as "PC") may be used. Further, for example, a plurality of displays may be used in combination. For example, the measurement result is displayed on the monitor 4.

For example, the chin rest 5 is used to keep the distance between the optometry E and the optometry device 1 constant, or to suppress large blurring of the face. For example, the chin base 5 and the housing 2 are fixed to the base 6. In the present embodiment, the chin rest 5 is used to keep the distance between the eye to be inspected E and the subjective optometry device 1 constant, but the present invention is not limited to this. The configuration may be such that the distance between the eye to be inspected E and the subjective optometry device 1 is kept constant. For example, as a configuration for keeping the distance between the eye to be inspected E and the subjective optometry device 1 constant, a configuration using a forehead pad, a face pad, or the like can be mentioned.

For example, the image pickup optical system 100 is composed of an image pickup device and a lens (not shown). For example, an imaging optical system is used to image the face of an eye to be inspected.

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

<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 to be inspected (details will be described later). For example, the optical characteristics of the eye to be inspected 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 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, and an objective lens 14. For example, the target light beam projected from the display 31 passes through the optical member 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 (used for objective measurement or the like described later), and the like. For example, the target luminous flux from the display 31 is projected toward the eye E to be inspected. For example, as the display 31, an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), or the like is used. In the present embodiment, the following description will be given by taking as an example a case where an LCD is used as the display 31.

In the present embodiment, the display 31 is used as a light source for projecting the target luminous flux, but the present invention is not limited to this. Any configuration may be used as long as it projects an optotype luminous flux. For example, a DMD (Digital Micromirror Device) may be used. Generally, 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 where the liquid crystal display 13 using polarized light is used. Further, for example, the configuration may include a visible light source for presenting an optotype and an optotype plate having a fixed optotype. In this case, for example, the optotype is a rotatable disc plate and has a plurality of optotypes. The plurality of optotypes include, for example, a fixed optotype for performing cloud fog on the subject's eye E at the time of objective measurement, which will be described later, and 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 the optical axis L2 of the projection optical system 30. The luminous flux of the optotype illuminated by the visible light source for presenting the optotype is directed toward the eye E to be inspected via the optical member from the projection lens 33 to the dichroic mirror 29.

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, and the like of the eye 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 lenses 61a and 61b are independently rotated about the optical axis L2 by driving the rotation mechanisms 62a and 62b, respectively. In the present embodiment, the astigmatism correction optical system 63 has been described by taking as an example a configuration using two positive cylindrical lenses 61a and 61b, 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 cylindrical axis, and the like. For example, the corrective lens may be moved in and out of the optical path of the light projecting optical system 30.

For example, the display 31 is integrally moved in the direction of the optical axis L2 by a drive mechanism 39 including a motor and a slide mechanism. 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 subject's eye is optically changed, so that the spherical refractive power of the subject's eye is corrected. That is, the movement of the display 31 constitutes a spherical power correction optical system. Further, for example, when the objective measurement is performed, the display 31 is moved to cast cloud fog on the subject eye E. 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 lens arranged in the optical path may be moved in the optical axis direction.

In the present 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 of 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, a configuration in which an astigmatism correction optical system 63 having a cylindrical power and a cylindrical shaft and a spherical power correction optical system (for example, a driving means 39) are separately provided has been described as an example. Is not limited to this. For example, the straightening optical system may be configured to include a straightening optical system in which the spherical power, the cylindrical degree, and the cylindrical shaft are corrected. For example, the correction optical system may be an optical system that modulates the wave surface. Further, for example, the straightening optical system may be an optical system that corrects spherical power, cylindrical power, cylindrical shaft, 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, dispersion prism, etc.) are arranged on the same circumference. The rotation of the lens disk is controlled by a drive unit (actuator or the like), so that the optical element desired by the examiner is arranged on the optical axis L2.

Further, the optical element (for example, a cylindrical lens, a cross cylinder lens, a rotary prism, etc.) arranged on the optical axis L2 is rotated and controlled by the drive unit, so that the optical element can be rotated at the rotation angle desired by the examiner. It is arranged in L2. Switching of the optical element arranged on the optical axis L2 may be performed by operating an input means (operating means) such as a monitor 4.

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 generated by the subjective measuring means. For example, the correction optical system 90 is used to correct astigmatism in optical aberration. 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 cylindrical axis. The cylindrical lenses 91a and 91b are independently rotated about the optical axis L3 by driving the rotation mechanisms 92a and 92b, respectively. In the present embodiment, the correction optical system 90 has been described by taking as an example a configuration using two positive cylindrical lenses 91a and 91b, but the present invention is not limited to this. The correction optical system 90 may have a configuration capable of correcting astigmatism. For example, the correction lens may be moved in and out of the optical axis L3. In the present embodiment, a configuration in which the correction optical system 90 is separately provided is given as an example, but the present invention is not limited to this. The correction optical system 60 may also be used as the correction optical system 90. In this case, the cylindrical power and the cylindrical axis of the eye 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 cylindrical axis in consideration of the amount of astigmatism (corrected). In this way, since the correction optical system 60 also serves as the correction optical system 90, for example, complicated control and a separate correction optical system for optical aberration are not required, so that the optical aberration is corrected with a simple configuration. can do.

<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 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. For example, the prism 15 is a luminous flux deflection member. For example, the drive unit 23 is a rotation means for rotationally driving the prism 15 around the optical axis L1. For example, the light source 11 has a conjugate relationship with the fundus of the eye to be inspected, and the hole portion of the hole mirror 13 has a conjugate relationship with the pupil. 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 is shared by 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 beam splitter 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 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 hole mirror 13. , A two-dimensional image pickup element 22 (hereinafter, referred to as an 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 image sensor 22 have a conjugate relationship with the fundus of the eye 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 has a positional relationship optically conjugated with the pupil of the eye to be inspected. It has become. For example, the output from the image sensor 22 is input to the arithmetic control unit 70 (hereinafter, control unit 70).

For example, the dichroic mirror 29 reflects the reflected light of the measurement light from the projection optical system 10a by the fundus of the eye to be inspected toward the light receiving optical system 10. Further, for example, the dichroic mirror 29 transmits the front eye portion observation light and the alignment light and guides them to the observation optical system 50. Further, for example, the dichroic mirror 35 reflects the reflected light of the measurement light from the projection optical system 10a by the fundus of the eye to be inspected 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 to the fundus, the fundus reflected light is extracted from the central portion of the pupil, and the ring-shaped measurement index is formed on the two-dimensional image pickup element. Well-known ones such as a configuration for receiving a fundus reflection image can be used.

The objective measurement optical system 10 is not limited to the above, and is limited to the projection optical system that projects the measurement light toward the subject's eye fundus and the reflected light acquired by the reflection of the measurement light on the fundus. It may be a measurement optical system having a light receiving optical system that receives light by a light receiving element. For example, the optical power measurement optical system may be configured to include a Shack-Hartmann sensor. Of course, other measurement type devices 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 image pickup element 22 of the light receiving optical system 10b can be integrally moved in the optical axis direction. In the present 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 image pickup element 22 have an optical axis L1 by a drive mechanism 39 for driving the display 31. It is moved integrally in the direction of. 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 image pickup element 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 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 to be inspected, the spherical refraction error is corrected with respect to the fundus of the eye to be inspected. The light source 11, the light receiving aperture 18, and the image pickup element 22 are optically coupled. 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 to be inspected at a constant magnification regardless of the amount of movement of the movable unit 25.

In the above configuration, the measurement light emitted from the light source 11 passes through the relay lens 12, the hall mirror 13, the prism 15, the dichroic mirror 35, the beam splitter 29, and the objective lens 14, and is a spot-shaped point on the fundus of the eye to be inspected. Form a light source image. 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 point light source image projected on the fundus of the eye is reflected and scattered to eject the eye to be inspected, condensed by the objective lens 14, the beam splitter 29, the dichroic mirror 35, the prism 15 rotating at high speed, the hole mirror 13, the relay lens 16, and the like. 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 image pickup element 22 by the collimator lens 19 and the ring lens 20.

For example, the prism 15 is arranged in a common optical path with the projection optical system 10a and the light receiving optical system 10b. For this reason, the reflected luminous flux from the fundus of the eye passes through the same prism 15 as the projected optical system 10a, so that the optical system after that is reversed as if there was no eccentricity of the projected luminous flux / reflected luminous flux (received luminous flux) on the pupil. It is scanned.

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>
In the present 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.

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. .. The first index projection optical system 45 emits near-infrared light for projecting an alignment index on the cornea of the eye to be inspected. The second index projection optical system 46 is arranged at a position different from that of the first index projection optical system 45 and includes six infrared light sources. In this case, the first index projection optical system 45 projects an index of infinity onto the cornea of the subject's eye E from the left-right direction, and the second index projection optical system 46 projects the index of infinity onto the cornea of the subject's eye E at a finite distance. The index is projected vertically or diagonally. For convenience, only a part of the first index projection optical system 45 and the second index projection optical system 46 is shown in this figure of FIG. 2. The second index projection optical system 46 is also used as anterior segment illumination for illuminating the anterior segment of the eye to be inspected. It can also be used as an index for measuring the shape of the cornea. Further, 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>
The observation optical system (imaging optical system) 50 includes an objective lens 14 and a 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 eye portion of the eye to be inspected. For example, the output from the image sensor 52 is input to the control unit 70. As a result, the image of the anterior segment of the eye to be inspected is imaged 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 to be inspected by the first index projection optical system 45 and the second index projection optical system 46, and is aligned by the control unit 70. The position of the 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. Note that FIG. 4 shows only the optical axis of the left eye measuring means 7L for convenience of explanation. Note that FIG. 5 shows only the optical axis of the left eye measuring means 7L for convenience of explanation.

For example, the optometry device 1 includes a conscious 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 83, a driving means 82, a half mirror 84, and a concave mirror 85. Of course, the subjective measuring means is not limited to this configuration. 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.

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

For example, the deflection mirror 81 has a pair of left and right deflection mirrors 81R for the right eye and a deflection mirror 81L for the left eye, respectively. For example, the deflection mirror 81 is arranged between the correction optical system 60 and the eye to be inspected. That is, the correction optical system 60 has a pair of left and right correction optical systems for the right eye and a correction optical system for the left eye, and the deflection mirror 81R for the right eye has the correction optical system for the right eye and the right eye. The deflection mirror 81L for the left eye is arranged between the eye ERs, and is arranged between the left eye correction optical system and the left eye ER. For example, the deflection mirror 81 is preferably arranged at the pupil conjugate position.

For example, the deflection mirror 81R for the right eye reflects the light flux projected from the measuring means 7R for the right eye and guides the light beam to the right eye ER. Further, for example, the reflected light reflected by the right eye ER is reflected and guided to the right eye measuring means 7R. 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 EL. Further, for example, the reflected light reflected by the left eye EL is reflected and guided to the left eye measuring means 7L. In the present 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 embodiment is limited to this. Not done. 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 may be used. For example, examples of the deflection member include a prism and a lens.

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

For example, the drive means 82 includes a motor (drive unit) and the like. For example, the driving means 82 has a driving means 82R for driving the deflection mirror 81R for the right eye and a driving means 82L for driving the deflection mirror 81L for the left eye. For example, the deflection mirror 81 rotates and moves by driving the drive 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. It should be noted that the optical path for the right eye and the optical path for the left eye may each be provided with a plurality of deflection mirrors. For example, there is a configuration in which two deflection mirrors are provided for each of the right eye optical path and the left eye optical path (for example, two deflection mirrors in the right eye optical path). 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, when the deflection mirror 81 is rotationally moved, the image of the correction optical system 60 is formed in front of the eye to be inspected, so that the apparent luminous flux can be deflected to optically correct the image formation position. 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 correction optical system for the right eye and the optical path for the left eye including the correction optical system for the left eye. Of course, the concave mirror 85 does not have to be a shared configuration. A concave mirror may be provided in each of the optical path for the right eye including the correction optical system for the right eye and the optical path for the left eye including the correction 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 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 to be inspected. In the present embodiment, the configuration in which the concave mirror 85 is used is given as an example, but the present invention is not limited to this. 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 to be inspected via the concave mirror 85. Further, for example, the measurement light projected from the objective measurement optical system 10 is projected onto the eye 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 the present embodiment, 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 as an example. However, it is not limited to this. 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 area between the concave mirror 85 to the eye E to be inspected in the objective measuring means. Is composed of at least coaxial with the optical axis of. In the present embodiment, the dichroic mirror 35 combines the optical axis L2 of the subjective measurement optical system 25 and the optical axis L1 of the objective measurement optical system 10 to be coaxial.

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 to be inspected by reflecting the target 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 the visual vision that has passed through the correction optical system 60. An image of the luminous flux is formed in front of the eye 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. 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 target luminous flux reflected by the concave mirror passes through the half mirror 84 and reaches the left eye EL.

As a result, an optotype image corrected by the correction optical system 60 with reference to the spectacle wearing position of the left eye EL (for example, about 12 mm from the apex of the cornea) is formed on the fundus of the left eye EL. 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 spherical power correction optical system (in the present embodiment, the drive mechanism 39 was driven). The subject can collimate the image of the optotype in a natural state through the concave mirror 85. In the present 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.

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. 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. It is incident on 90. 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, reaches the left eye EL, and forms a spot-shaped point light source image on the fundus of the left eye 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 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 the dichroic mirror 29. , Dichroic mirror 35, prism 15, hole mirror 13, relay lens 16, and 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 to be inspected can be objectively measured.
As described above, for example, the subjective eye examination device 1 in the present embodiment forms an image of the correction optical system in front of the eye to be inspected. Then, the subjective optometry device 1 in the present embodiment is provided with the objective measuring means together with the subjective measuring means, so that the subjective measurement and the objective measurement can be performed without arranging the correction optical system in front of the subject's eyes. It can be done in the open state. As a result, it becomes possible to measure in a natural state as if the subject sees things in daily life, and the measurement can be performed satisfactorily. Further, the optical characteristics by subjective measurement and the optical characteristics by objective measurement can be performed by one device, and the optical characteristics of the eye to be inspected can be measured smoothly. For example, the subjective eye examination device 1 in the present embodiment is An optical member is commonly used between the subjective measuring means and the objective measuring means. As a result, the number of members can be reduced, and the device can be configured with a simple configuration. In addition, the extra space can be reduced and the device can be miniaturized.

For example, the subjective eye examination device 1 in the present embodiment includes an optical axis between the optical member and the eye to be inspected in the subjective examination means, and an optical axis between the optical member and the eye to be inspected in the objective examination means. Is coaxial. Therefore, by making one adjustment when measuring the eye to be inspected, the other adjustment can be completed, and the adjustment at the time of measurement can be easily performed. That is, by adjusting the objective measuring means, the subjective measuring means can be easily adjusted.

For example, the subjective optometry device 1 in this embodiment uses a concave mirror 85. Therefore, in the subjective measuring means, it is possible to optically present the optotype at a predetermined inspection distance, and when the optotype is presented at the predetermined inspection distance, the member or the like is set so as to be the actual distance. No need to place. As a result, extra members and space are not required, and the device can be miniaturized.

<Control unit>
For example, the control unit 70 includes a CPU (processor), RAM, ROM, and the like. For example, the CPU of the control unit 70 controls each member of the optometry device 1. For example, RAM temporarily stores various types of information. The ROM of the control unit 70 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 control unit 70 is electrically connected to a non-volatile memory (storage unit) 72, a monitor (also serving as an operation unit in this embodiment) 4, various members, and the like. The non-volatile memory (hereinafter referred to as memory) 72 is a non-transient storage medium capable of retaining the storage contents even when the power supply is cut off. For example, a hard disk drive, a flash ROM, an OCT device 1, a USB memory detachably attached to the subjective optometry device 1, and the like can be used as the non-volatile memory 72. For example, the memory 72 stores a control program for controlling the subjective measuring means and the objective measuring means.

<Changing the convergence angle by adjusting the deflection angle with respect to the concave mirror>
In the present embodiment, the control unit 70 controls each optical deflection member (for example, deflection mirrors 81R, 81L) arranged in the right eye optical path and the left eye optical path, and controls the right eye measurement optical axis L4R and the left. The deflection angle of the optical measurement optical axis L4L for the eye may be changed with respect to the horizontal direction. For example, the control unit 70 may change the incident angles of the measurement optical axes L4R and L4L with respect to the concave mirror 85, and may change the convergence angle of the target luminous flux emitted from the right eye optical path and the left eye optical path. As a result, the convergence angle can be changed according to the display distance of the optotype.

In this case, by changing the angles of the measurement optical axes L4R and L4L with respect to the horizontal direction (X direction), the position of the intersection C of the measurement optical axes L4R and L4L is changed (see FIGS. 6 and 7). Since the luminous flux from the right eye measuring means 7R is projected onto the right eye ER with the measuring optical axis L4R as the main ray, the line-of-sight direction of the right eye ER is coaxial with the measuring optical axis L4R. Similarly, since the target luminous flux from the left eye measuring means 7L is projected onto the left eye EL with the measurement optical axis L4L as the main light beam, the line-of-sight direction of the left eye EL is coaxial with the measurement optical axis L4L. As a result, the convergence angle of the target luminous flux is changed, and the convergence angles of the left and right eyes are changed.

More specifically, for example, the control unit 70 may move the deflection angles of the measurement optical axes L4R and L4L by controlling the drive means 82 and adjusting the reflection angles of the deflection mirrors 81R and 81L. Of course, the present invention is not limited to the deflection mirrors 81R and 81L, and other light deflection members may be used.

FIG. 6 is an example of presenting an optotype from a long distance. For example, the control unit 70 may set the convergence angle corresponding to the distance by deflecting the measurement optical axes L4R and L4L so that the measurement optical axes L4R and L4L pass through the focal position of the concave mirror 85. .. It is not always necessary to pass the optical axis through the exact focal position, as long as it is a convergence angle corresponding to a long distance.

For example, the measurement optical axes L4R and L4L after being reflected by the concave mirror 85 have a parallel relationship with each other and are in the same direction as the Z direction. The intersection C is formed at an infinity or a distance position (for example, a position apparently 5 m away from the eye to be inspected). In this case, the control unit 70 may adjust the presentation position of the optotype to form an image of the optotype at a distance position of the eye to be inspected. As a result, the optotype is apparently presented to the eye to be inspected from a distance, and the left and right optotype luminous fluxes are set at a convergence angle corresponding to the distance.

FIG. 7 is an example of the case where the optotype is presented from a short distance. For example, the control unit 70 deflects the measurement optical axes L4R and L4L so that the angle formed by the measurement optical axes L4R and L4L and the measurement optical axes of the measurement means 7R and 7L is further smaller than the distance. , The convergence angle can be shifted closer.

For example, the control unit 70 may deflect the measurement optical axes L4R and L4L so that the measurement optical axes L4R and L4L immediately before being reflected by the concave mirror 85 are in a parallel relationship with each other. The measurement optical axes L4R and L4L after being reflected by the concave mirror 85 pass through the focal position of the concave mirror 85 and reach the left and right eyes. As a result, the intersection C is apparently formed at the focal position of the concave mirror 85. In this case, the control unit 70 may adjust the display position of the optotype to form an image of the optotype at a near position corresponding to the intersection C. As a result, the optotype is apparently presented to the eye to be inspected from the near position, and the left and right optotype luminous fluxes are set to the convergence angle corresponding to the set near distance.

Of course, the display distance of the optotype is not limited to the above. That is, the control unit 70 may arbitrarily change the convergence angle of the target luminous flux by deflecting the measurement optical axes L4R and L4L and changing the position of the intersection C with respect to the eye to be inspected. In this case, the correspondence between the deflection angle (driving angle) of the light deflection member and the target display distance may be set in advance and stored in the memory 72. Specifically, the reflection angles of the deflection mirrors 81R and 81L may be associated with the target display distance in advance. In this case, the corresponding table, the calculation formula, and the like may be stored in the memory 72.

For example, the control unit 70 may input the display distance of the optotype based on the operation signal from the operation unit 4 and acquire the deflection angle corresponding to the presentation distance from the memory 72. Further, the control unit 70 may drive the light deflection member to an angle corresponding to the acquired deflection angle.

According to the above, by switching the deflection angles of the measurement optical axes L4R and L4L with respect to the concave mirror 85 according to the change in the display distance of the optotype, it is possible to present the optotype in a form close to natural vision, which is good. The measurement result can be obtained.

In the above description, when the projection optical system 30 is controlled to change the target presentation distance, the control unit 70 changes the target presentation distance by changing the spherical power of the correction optical system 60. You may change it. For example, when the optotype is presented at a predetermined near-distance distance (for example, 33 cm), the distance correction power (distance correction power determined by the distance objective refractive power measurement or the distance vision measurement). The display 31 may be arranged at a position closer to the near distance by a frequency (for example, 3.0D) corresponding to the near distance with reference to the position of.

<PD adjustment by changing the distance between the left and right measurement optical axes>
In the present embodiment, the control unit 70 controls each light deflection member (for example, deflection mirrors 81R, 81L) arranged in the right eye optical path and the left eye optical path, and controls the right eye measurement optical axis L4R and the left. The distance LPD between the optical axes L4L for measuring the eye may be changed with respect to the horizontal direction (X direction) (see FIG. 8). In this case, the position of each light deflection member in the horizontal direction is adjusted based on the interpupillary distance of the subject, so that the optical path for the right eye and the optical path for the left eye are the interpupillary distances of the subject (left and right). It may be arranged at a position corresponding to the eye distance). The interpupillary distance of the subject may be obtained by obtaining the distance between the left and right eyes by image processing using the above-mentioned binocular imaging optical system, or the measurement result previously measured by a PD meter or the like is stored in the memory 72. It may be obtained from.

As a result, a pair of left and right measurement optical systems are arranged at positions corresponding to the interpupillary distance. For example, the measurement optical axes of the pair of left and right subjective measurement optical systems 25 are arranged at positions corresponding to the interpupillary distance. As a result, the correction optical system 60, the projection optical system 30, and the like are arranged at positions corresponding to the interpupillary distance. Further, for example, the measurement optical axes of the pair of left and right objective measurement optical systems 10 are arranged at positions corresponding to the interpupillary distance. The adjustment of the distance LPD between the optical axes may be automatically executed, for example, before the alignment operation for the eye to be inspected, before the objective measurement, or before the subjective measurement, or the operation signal from the operation unit 4 may be used. It may be executed based on.

The positions of the measurement optical axes L4R and L4L are changed in the horizontal direction (X direction) by the drive means (for example, the drive means 83) that drives each optical deflection member in the horizontal direction, so that the measurement optical axes L4R and L4L The position of may be changed. Further, as a specific method for changing the distance LPD between the optical axes, for example, the control unit 70 controls the driving means 83 and adjusts the positions of the deflection mirrors 81R and 81L in the horizontal direction to adjust the measurement optical axes L4R. The position of L4L may be moved. Of course, the present invention is not limited to the deflection mirrors 81R and 81L, and other light deflection members may be used.

FIG. 8 is a diagram illustrating a change in the distance LPD between optical axes due to the movement of the deflection mirror 81. In the present embodiment, the LPD can be changed by moving the deflection mirror 81 in the X direction. For example, the deflection mirror 81R in FIG. 8A is moved so that the distance between the measuring means 7R and the deflection mirror 81R is shortened (so that the deflection mirror 81R is brought closer to the measuring means 7R in the X direction). Further, for example, the deflection mirror 81L is moved so that the distance between the measuring means 7L and the deflection mirror 81L becomes short (so that the deflection mirror 81L approaches the measuring means 7L in the X direction). As a result, the deflection mirror 81 moves as shown in FIG. 8 (b). Therefore, the optical axis distance LPD1 shown in FIG. 8A is changed to the optical axis distance LPD2 shown in FIG. 8B.

In the above, the correspondence between the position of the light deflection member in the horizontal direction and the interpupillary distance PD may be preset and stored in the memory 72. Specifically, the horizontal positions of the deflection mirrors 81R and 81L and the interpupillary distance may be associated in advance. In this case, the corresponding table, the calculation formula, and the like may be stored in the memory 72.

For example, the control unit 70 may acquire the horizontal position (driving position) of the light deflection member corresponding to the interpupillary distance of the eye to be inspected obtained by the interpupillary distance measuring means from the memory 72. Further, the control unit 70 may move the light deflection member to the acquired horizontal position.

<Aberration correction>
The control unit 70 may set a correction amount for correcting optical aberrations that occur in the optical path of the measurement optical system (for example, the optical path for the left eye and the optical path for the right eye). Further, the control unit 70 may control the correction optical system 90 based on the set correction amount to correct the optical aberration generated in the optical path of the measurement optical system. The amount of aberration correction in the correction optical system 90 is preferably set to an amount of aberration that can cancel the generated optical aberration, but is not limited to this as long as it does not interfere with the inspection.

As the optical aberration generated in the optical path of the measurement optical system, for example, astigmatism of the light flux generated by the concave mirror 85 can be considered. Such astigmatism may affect at least one of the subjective measurement optical system 25 and the objective measurement optical system 10. The astigmatism is a directional aberration, and when the astigmatism is corrected, for example, the aberration may be corrected so as to cancel the direction in which the astigmatism is generated.

<Aberration correction according to the correction power>
The amount of optical aberration may vary depending on the change in the reflection position or the reflection area (luminous flux diameter) of the light beam on the concave mirror 85. As an example, the reflected area of the target luminous flux changes due to the change in the correction power of the correction optical system 60, and as a result, the amount of aberration changes.

That is, the state of condensing the luminous flux with respect to the concave mirror 85 differs depending on the correction power set by the correction optical system 60. For example, when the correction power is 0D, the target luminous flux is incident on the concave mirror 85 from infinity with a parallel luminous flux. The stronger the correction power is on the positive side, the stronger the target luminous flux is incident on the concave mirror 85 as a stronger diffuse luminous flux, so that the reflection area becomes larger and the aberration becomes larger. As the correction power is stronger on the negative side, the target luminous flux is incident on the concave mirror 85 as a stronger convergent luminous flux, so that the reflection area becomes smaller and the aberration becomes smaller. Due to such a difference in the reflection area, the amount of astigmatism added by the concave mirror 85 differs.

Therefore, in the present embodiment, the amount of aberration correction in the correction optical system 90 may be changed according to the correction power of the correction optical system 60. Thereby, regardless of the correction power, it is possible to present a target with less astigmatism and less astigmatism. Therefore, the subjective measurement or the objective measurement can be performed with high accuracy.

In this case, a table in which the correction amount for correcting the astigmatism by the concave mirror 85 is preset for each correction power may be created, and the created table may be stored in the memory 72. The correction amount for each correction power may be obtained by, for example, an optical simulation or an experiment. It is not always necessary to use a table, and an arithmetic expression for deriving the correction amount for each correction frequency may be stored in the memory 72, and the correction amount may be obtained using the arithmetic expression.

The correction amount for each correction power may be created for each spherical power. Further, a correction amount may be created for each astigmatic power and for each axial angle in consideration of the difference in astigmatic power and axial angle at each spherical power. According to the simulations of the present inventors, the amount of change in astigmatism is greatly affected by the change in spherical power, so that a certain effect can be obtained by changing the amount of correction for each spherical power. Conceivable. When the correction amount is set for each correction power, the correction amount may be sequentially different for each power, and for example, within a predetermined step (for example, 0 to 1.0D, 1.0 to 2). A constant correction amount may be set in 1.0D steps such as .0, and the correction amount may be changed for each step.

When the correction power of the correction optical system 60 is set based on the objective power (spherical power S, astigmatic power C, astigmatic axis angle A), the control unit 70 controls the objective power (objective refraction). An aberration correction amount corresponding to the correction power corresponding to the error) may be acquired from the memory 72, and the correction optical system 90 may be controlled based on the acquired aberration correction amount.

That is, the control unit 70 may set the aberration correction amount based on the objective optical power obtained by the objective optical power measuring device (for example, the objective measuring optical system 10). The control unit 70 may control the correction optical system 90 based on the set aberration correction amount to correct the aberration.

When setting the aberration correction amount according to the correction power, it is not always necessary that the numerical data of the correction power and the aberration correction amount are associated with each other. For example, an operation when the correction power is input by the operation unit 4. The signal may be associated with the aberration correction amount, the drive information of the correction optical system 60 (for example, the position of the display 31 or the like) may be associated with the aberration correction amount, or as described above. The measurement result by the sensory optical power measuring device and the aberration correction amount may be associated with each other.

When changing the apparent presentation distance of the optotype, astigmatism as described above may occur. In this case, the control unit 70 changes the aberration correction amount according to the target presentation distance, so that the target with reduced aberration is presented regardless of the change in the presentation distance. The control unit 70 may change the aberration correction amount of the correction optical system 90 according to the target distance presented to the eye to be inspected by the light projection optical system 30. In this case, the optotype display distance and the aberration correction amount may be associated with each other, or the drive information of the projection optical system 30 (for example, the position of the display 31) and the aberration correction amount may be associated with each other. .. When the presentation distance of the optotype is changed by controlling the correction dioptric power of the correction optical system 60, the aberration correction amount may be set according to the correction dioptric power to which the presentation distance of the optotype is added.

The example in which the amount of aberration differs depending on the change in the reflection area of the light beam on the concave mirror 85 is not limited to the above, and the fundus projected by the objective measurement optical system 10 due to the change in the refractive power of the eye to be examined. The area of reflection of the light beam measured from the light beam on the concave mirror 85 changes, and as a result, the amount of aberration changes. In this case, the measurement image (for example, ring image) of the objective measurement optical system 10 may be distorted. Therefore, the aberration correction amount of the correction optical system 90 may be changed according to the objective eye refractive power obtained in advance by the objective measurement optical system 10). As a result, a measured image with reduced aberration can be obtained. As a result, the refractive power of the eye can be accurately performed. As for the table, calculation formula, etc. for setting the aberration correction amount, the same method as described above and the correction power can be adopted, so that a special description will be omitted. Since the same parameters (SCA) can be used for the objective refractive power and the correction power, the same table or calculation formula may be used when making these corrections.

<Aberration correction according to the deflection angle or position of the light deflection member>
Further, a luminous flux (for example, an objective luminous flux, an objective measurement) on the concave mirror 85 is caused by a change in at least one of a deflection angle of the light deflection member (for example, deflection mirrors 81R and 81L) and a horizontal position of the light deflection member. The reflection position of the measured luminous flux of the optical system 10) changes, and the amount of aberration changes.

Therefore, in the present embodiment, the control unit 70 determines the amount of aberration correction in the correction optical system 90 according to at least one of the deflection angle of the light deflection member (for example, deflection mirrors 81R and 81L) and the horizontal position of the light deflection member. May be changed. Thereby, for example, it is possible to present a good optotype with astigmatism reduced regardless of the deflection angle and the horizontal position of the light deflection member. In addition, a good measurement image in which astigmatism is reduced can be obtained regardless of the deflection angle and horizontal position of the deflection member. Therefore, the subjective measurement or the objective measurement can be performed with high accuracy.

In this case, a table in which the correction amount for correcting the astigmatism by the concave mirror 85 is preset for each of the parameters of the deflection angle and the horizontal position may be created, and the created table is stored in the memory 72. May be done. The correction amount may be obtained by, for example, an optical simulation or an experiment. It is not always necessary to use a table, and an arithmetic expression for deriving the aberration correction amount may be stored in the memory 72, and the correction amount may be obtained using the arithmetic expression. In this case, the correction amount may be sequentially different according to each parameter, or for example, a constant correction amount may be set within a predetermined step of the parameter, and the correction amount may be changed for each step.

When setting the aberration correction amount according to the deflection angle of the light deflection member, it is not always necessary that the numerical data of the deflection angle and the aberration correction amount are associated with each other, and the drive angle information of the light deflection member (for example, The drive signal of the drive means 82) and the aberration correction amount may be associated with each other. Further, as described above, when the convergence angle of the target luminous flux is changed according to the target display distance, the convergence angle and the aberration correction amount may be associated with each other. That is, the control unit 70 may change the aberration correction amount of the correction optical system 90 according to the convergence angle of the target luminous flux changed by driving the light deflection member. Further, as described above, when adjusting the alignment of the measurement optical axes L1R and L1L with respect to the eye to be inspected by adjusting the deflection angle of the light deflection member, the alignment position of the eye to be inspected and the aberration correction amount may be associated with each other.

When setting the aberration correction amount according to the position of the light deflection member, it is not always necessary that the position data and the aberration correction amount are associated with each other, and the drive position information of the light deflection member (for example, the drive means 82). The drive signal) and the aberration correction amount may be associated with each other. Further, as described above, when the pair of measurement optical systems are associated with the interpupillary distance by adjusting the horizontal position of the light deflection member, the interpupillary distance and the aberration correction amount may be associated with each other. That is, the control unit 70 may change the aberration correction amount of the correction optical system 90 according to the interpupillary distance of the eye to be inspected.

<Support for multiple parameters>
The above-mentioned aberration correction according to the correction power may be performed at the same time as the aberration correction according to the deflection angle or position of the light deflection member at the time of subjective measurement, for example. In this case, the aberration correction amount is set individually, and the aberration correction amount which is the sum of these may be set. More preferably, the amount of aberration correction according to the correction power changes depending on the change in the deflection angle and position of the light deflection member. Therefore, a table, an arithmetic expression, or the like for deriving the optimum aberration correction amount from the three variable parameters of the correction power, the deflection angle of the light deflection member, and the position may be stored in the memory 72 in advance. In this case, the aberration correction amount of the correction optical system 90 may be changed according to the change of at least one parameter.

That is, when the aberration correction amount is obtained based on a plurality of parameters, a table, an arithmetic expression, or the like for deriving the optimum aberration correction amount from the plurality of parameters may be stored in the memory 72 in advance. For example, similarly, the aberration correction according to the objective refractive power may be performed at the same time as the aberration correction according to the deflection angle or position of the light deflection member at the time of objective measurement. In this case, the aberration correction amount is set individually, and the aberration correction amount which is the sum of these may be set. More preferably, the amount of aberration correction according to the objective refractive power changes depending on the change in the deflection angle and position of the light deflection member. Therefore, a table, an arithmetic expression, or the like for deriving the optimum aberration correction amount from the three variable parameters of the objective refractive power, the deflection angle of the light deflection member, and the position may be stored in the memory 72 in advance. In this case, the aberration correction amount of the correction optical system 90 may be changed according to the change of at least one parameter.

<Control operation>
Hereinafter, the control operation of the subjective optometry device 1 will be described. The examiner puts the subject's chin on the chin rest 5 and instructs the examiner to observe the presentation window 3. The examiner instructs the examinee to fix the fixation target displayed on the display 31, and then aligns the eye to be examined. When the alignment start switch is selected by the examiner, the control unit 70 starts automatic alignment.

For example, the control unit 70 detects the pupil positions of the left and right eyes to be inspected from the face image captured by the imaging optical system 100. For example, when the pupil position is detected, the control unit 70 controls the subjective optometry device 1 so that the image of the anterior eye portion is displayed on the monitor 4. For example, the control unit 70 drives the deflection mirror 81R for the right eye and the deflection mirror 81L for the left eye, respectively, and rotates them in the XY directions. Further, for example, when the pupil position is detected, the control unit 70 can move the right eye measuring means 7R and the left eye measuring means 7L in the X direction, respectively. That is, the control unit 70 aligns in the XY direction by driving the deflection mirror 81, and aligns in the Z direction by driving the measuring means 7.

In the present embodiment, a configuration in which the alignment in the XYZ direction is adjusted by driving the deflection mirror 81 and the measuring means 7 is described as an example, but the present invention is not limited to this. Any configuration may be used as long as the positional relationship between the eye to be inspected and the subjective measuring means and the objective measuring means can be adjusted. That is, the configuration may be such that the XYZ direction can be adjusted so that the image corrected by the correction optical system 60 is formed on the fundus of the eye to be inspected. For example, the chin rest 6 may be provided with a configuration in which the subjective optometry device 1 can be moved in the XYZ direction, and the subjective optometry device 1 may be moved. Further, for example, the configuration may be such that the XYZ direction can be adjusted only by the deflection mirror 81. In this case, for example, the deflection mirror 81 may be rotationally driven and the deflection mirror 81 may move in the Z direction so that the distance between the deflection mirror 81 and the measurement unit changes.

FIG. 9 is a diagram showing an anterior segment observation screen on which an anterior segment image captured by the image sensor 52 is displayed. In this embodiment, the alignment control for one of the two eyes to be inspected will be described. The other eye to be inspected is also controlled in the same manner as in the following description. For example, in the alignment control, both eyes may be displayed on the monitor 4 and the alignment control of both eyes may be performed on the same screen. Further, for example, in the alignment control, one eye to be inspected is displayed on the monitor 4, and after the alignment control of one eye to be inspected is completed, the other eye to be inspected is displayed on the monitor 4 and the other eye to be inspected. Alignment control may be performed. Further, for example, the alignment control of the other eye to be inspected may be performed based on the alignment control result of one eye to be inspected.

For example, the control unit 70 detects the displacement of the image of the correction optical system 60 with respect to the eye to be inspected. For example, the control unit 70 controls the driving means based on the detected detection result, and deflects the apparent luminous flux for guiding the image of the correction optical system 60 to the eye to be inspected, thereby determining the image formation position. Optically correct. As described above, the subjective optometry apparatus 1 in the present embodiment includes a configuration that detects the positional deviation between the eye to be inspected and the correction optical system and optically corrects the image formation position. As a result, by correcting the misalignment between the eye to be inspected and the corrective optical system, the device can be used at an appropriate position, and measurement can be performed with high accuracy.

More specifically, for example, at the time of alignment, the light sources of the first index projection optical system 45 and the second index projection optical system 46 are turned on. For example, the control unit 70 detects the XY center coordinates (see the cross mark in FIG. 9) of the index images Ma to Mah projected in a ring shape as the substantially corneal apex position Mo. For example, the alignment reference position O1 in the XY direction set for determining the alignment state is set. For example, in the present embodiment, the alignment reference position O1 has the corneal apex position and the optical axis of the subjective optometry device 1 (the optical axis of the optical path through which the light flux reflected by the concave mirror 85 passes) L4 (L4R, L4L). It is set as a matching position. For example, the alignment reference position O1 is an alignment reference position used in the subjective optometry apparatus 1. Further, for example, an alignment allowable range A1 for determining the suitability of alignment is set in a predetermined region centered on the alignment reference position O1.

FIG. 10 is a diagram illustrating alignment control. For example, the control unit 70 obtains the deviation amount Δd between the alignment reference position O1 and the corneal apex position Mo. The control unit 70 drives the deflection mirror 81 and adjusts the alignment in the XY directions so that the deviation amount Δd falls within the allowable range A1.

Further, the control unit 70 aligns in the Z direction by comparing the image ratio (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. The deviation amount Δd is obtained. In this case, when the operating distance (distance in the Z direction) between the eye to be inspected and the subjective eye examination device 1 is deviated, the control unit 70 hardly changes the distance between the above-mentioned infinity indexes Ma and Me. On the other hand, the amount of alignment deviation in the working distance direction with respect to the subject's eye is obtained by utilizing the characteristic that the image spacing of the index images Mh and Mf changes (for details, refer to JP-A-6-46999).

Further, the control unit 70 also obtains the deviation amount Δd with respect to the alignment reference position in the Z direction in the Z direction as in the XY direction, so that the deviation amount Δd falls within the alignment allowable range A1 in the Z direction. The alignment in the Z direction is operated by the drive control of the measuring means 7.

Here, when the alignment deviation amount Δd in the XYZ direction falls within the allowable range A1, the driving of the deflection mirror 81 and the measuring means 7 is stopped, and the alignment completion signal is output. Even after the alignment is completed, the control unit 70 detects the deviation amount Δd at any time, and when the deviation amount Δd exceeds the allowable range A1, the automatic alignment is restarted. That is, the control unit 70 controls (tracking) the imaging unit 3 to track the eye E so that the deviation amount Δd satisfies the permissible range A1.

In the present embodiment, a configuration in which the control unit 70 automatically performs alignment control has been described as an example, but the present invention is not limited to this. For example, a mark indicating the alignment reference position electronically may be displayed on the monitor 4, and the examiner may operate the monitor 4 to adjust the positional relationship between the alignment reference position and the eye to be inspected. In this case, for example, the control unit 70 may display the fact on the monitor 4 when the alignment in the XYZ directions is completed.

Further, for example, the subject may be guided until the alignment state becomes appropriate (alignment is completed). In this case, the control unit 70 may display on the monitor 4 when the alignment in the XYZ direction is completed when the corneal apex position is within the alignment allowable range.

<Objective measurement>
The control unit 70 emits a trigger signal for starting objective measurement (objective measurement) based on the output of the alignment completion signal. When the trigger signal for starting the objective measurement is emitted, the control unit 70 emits the measured luminous flux from the objective measurement optical system 10. In this case, each measured luminous flux is reflected by the concave mirror 85 via the deflection mirrors 81R and 81L, and then projected onto the fundus of the eye to be inspected. The measurement light reflected from the fundus is reflected by the deflection mirror 81R (81L) via the concave mirror 85, and then the measurement image is captured by the image sensor 22.

For example, in the measurement of the objective refractive power, the preliminary measurement of the refractive power of the eye is first performed, and the display 31 is moved in the optical axis L2 direction based on the result of the preliminary measurement, so that the eye to be inspected E is measured. Cloud fog may be applied. That is, the display 31 may be moved to a position where it is once in focus with respect to the eye E to be inspected. After that, the main measurement of the optical power of the eye to be inspected may be subjected to cloud fog. In this measurement, the measured image is captured by the image sensor 22, and the output signal from the image sensor 22 is stored in the memory 72 as image data (measured image). After that, the control unit 70 analyzes the ring image stored in the memory 72 to obtain the value of the refractive power in each meridian direction. By applying a predetermined process to this refractive power, the control unit 70 performs objective refractive power of S (spherical power), C (astigmatism power), and A (astigmatism axis angle) of the subject's eye at the time of long-distance use. (Objective value) is obtained. The obtained objective value at the time of long-distance use is stored in the memory 72.

In the measurement of the objective optical power, the control unit 70 may control the correction optical system 90 to correct the optical aberration generated in the optical path of the objective measurement optical system 10. In this case, a correction amount corresponding to the refractive index measured by the objective measurement optical system 10 is acquired from the memory 72, and the correction optical system 90 is controlled based on the acquired aberration correction amount.

More specifically, the correction amount is set according to the refractive power of the eye obtained in the preliminary measurement, and the correction optical system 90 is driven based on the set correction amount. As a result, since the main measurement is performed in a state where the aberration generated in the optical path of the objective measurement optical system 10 is corrected, the objective refractive power can be measured accurately. When the eye refractive power is continuously measured (for example, a plurality of the main measurements are performed), the correction optical system 90 may be controlled based on each measurement result.

In the above description, the objective refractive power for long-distance use was measured, but the present invention is not limited to this, and the near-use is the refractive power for the eye when the optotype is presented at a near-distance distance. The objective refractive power may be measured. The objective refractive power measurement may be performed simultaneously for the left and right eyes, or may be performed at different timings for the left and right eyes.

<Awareness measurement>
When the objective refractive power measurement is completed and the monitor (also serving as the operation unit in the present embodiment) 4 is operated, the mode is switched to the conscious distance vision measurement mode (conscious refractive power measurement) mode. The control unit 70 drives the correction optical system 60 based on the objective refractive power (spherical power S, astigmatic power C, astigmatic axis angle A) of the eye to be inspected obtained by measuring the objective refractive power for distance use. , The refraction error of the eye to be inspected may be corrected.

More specifically, the display 31 may be moved in the optical axis L2 direction based on the spherical power S in the distance measurement of the objective refractive power. As a result, the refraction error regarding the spherical power of the eye to be inspected is corrected. Further, the astigmatism correction optical system 63 may be driven based on the astigmatism power C and the astigmatism axis angle A. As a result, the refractive power error related to astigmatism of the eye to be inspected is corrected.

In the visual acuity measurement mode, the control unit 70 may change the amount of aberration correction by the correction optical system 90 according to the correction power corrected by the correction optical system 60. For example, when the correction power of the correction optical system 60 is changed based on the operation signal from the monitor 4, the control unit 70 changes the aberration correction amount by the correction optical system 90 according to the changed correction power. May be good. As a result, even if there is a change in the correction power based on the measurement result by the autoref, the target with reduced aberration is presented.

Further, the control unit 70 may control the display 31 and display a required visual acuity value optotype on the optical axis L2 (for example, an optotype having a visual acuity value of 0.8). When the initial visual acuity is presented to the subject's eye, the examiner makes a distance vision measurement of the subject. When a predetermined switch on the monitor 4 is pressed, the visual acuity value optotype presented is switched.

For example, if the subject's answer is correct, the examiner switches to an optotype 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 based on the signal of changing the visual acuity value from the monitor 4.

Further, the examiner may use the monitor 4 to change the correction power of the correction optical system 60 to obtain the distance awareness value (spherical power S, astigmatism power C, astigmatism axis angle A) of the eye to be inspected.

The correction dioptric power of the correction optical system 60 may be set to different dioptric powers for the left and right eyes, or may be set to the same dioptric power for the left and right eyes. The subjective eye refractive power measurement may be performed simultaneously for the left and right eyes, or may be performed at different timings for the left and right eyes. In the case of different timings, the optotype may not be displayed on the display 31 of the non-measuring eye, or a fog (for example, a constant refractive power is added to the objective value) by the correction optical system 60. ) May be performed.

After the consciousness value for distance use is obtained, the mode may be switched to the consciousness near vision measurement mode. When set to the near vision measurement mode, the control unit 70 may control the projection optical system 30, change the convergence angle by the deflection mirror 81, and present an optotype at the near vision position. The display distance of the optotype in the near-field inspection may be arbitrarily changed based on the operation signal from the operation unit 4. As a result, the display distance of the optotype is changed from the far-distance position to the near-distance position. In the near vision inspection, the degree of addition and accommodation may be consciously obtained by changing the display distance of the optotype at the near vision position.

In this case, for example, the control unit 70 may acquire an aberration correction amount according to the display distance of the optotype from the memory 72, and control the correction optical system 90 based on the acquired aberration correction amount. Further, when the target presentation distance is changed, the control unit 70 may change the aberration correction amount by the correction optical system 90 according to the changed target presentation distance. As a result, even if the target display distance is changed, the target with reduced aberration is presented. In this case, the control unit 70 may change the aberration correction amount according to the correction power to which the display distance of the optotype is added.

Further, the control unit 70 may control the light deflection member and change the convergence angle of the left and right optotype luminous flux according to the change of the display position of the optotype. In this case, for example, the control unit 70 acquires an aberration correction amount corresponding to the deflection angle of the light deflection member corresponding to the convergence angle from the memory 72, and controls the correction optical system 90 based on the acquired aberration correction amount. You may. Further, when the convergence angle of the target luminous flux is changed, the control unit 70 may change the amount of aberration correction by the correction optical system 90 according to the changed convergence angle. As a result, even if the convergence angle is changed, the target with reduced aberration is presented.

In the near vision inspection, as in the distance inspection, for example, the examiner changes the correction power of the correction optical system 60 by using a predetermined switch of the operation unit 4, and the near vision target is presented. Perceived eye refractive power (nearby perceived value) may be measured. In the near-field inspection, the control unit 70 may change the aberration correction amount of the correction optical system 90 according to the change of the correction power.

As shown above, by changing the amount of aberration correction in the objective test and the subjective test, the entire test can be performed satisfactorily. In the above description, aberration correction is performed in both the objective test and the subjective test, but the present invention is not limited to this, and the amount of aberration is changed by the correction optical system 90 in either the objective test or the subjective test. May be done.

In the above description, the correction optical system 90 is provided separately from the correction optical system 60, but the above embodiment can be applied even when the correction optical system 60 also serves as the correction optical system 90. For example, astigmatism correction optical system 63 may be used as the correction optical system 90. In this case, for example, an aberration correction amount may be added to the astigmatism power as the correction power and the axial angle.

In the above configuration, since the optical system is designed so that the optical axis of the measurement optical system is arranged on the optical axis of the concave mirror 85, the aberration generated by the concave mirror 85 can be suppressed. Therefore, the amount of aberration correction by the correction optical system 90 described above can be small. However, the present embodiment can be applied even if the optical axis of the measurement optical system is arranged outside the axis of the concave mirror 85.

<Auxiliary optical member>
It should be noted that the auxiliary optical member may be arranged in the optical path of the subjective measurement optical system in case the eye to be inspected is an intensified refractive error eye. The auxiliary optical member may be, for example, a lens, a prism, a mirror, or the like. When the diopter value of the eye to be measured is large, the optical aberration may not be corrected only by the correction optical system 90. Therefore, by using the auxiliary optical member, it is possible to correct the optical aberration that cannot be corrected by the correction means only by the correction optical system 90, and the measurement can be performed with high accuracy. More specifically, for example, in the case of a 13.0D subject, a 10.0D auxiliary optical member (for example, a temporary frame) is attached. The measurement is performed in that state, and the correction power of the auxiliary optical member is taken into consideration for the acquired measurement result. For example, when the measurement result of the subject is 3.0D, the measurement result is corrected, and the subject outputs the result of 13.0D.

In this case, the control unit 70 may perform a determination process for determining whether or not an auxiliary optical member is required based on the optical power obtained by the objective measuring means. Further, the control unit 70 may control the insertion / removal of the auxiliary optical member into the optical path of the subjective measurement optical system based on the result of the determination process. As a result, the auxiliary optical member is automatically inserted and removed, and measurement can be easily and accurately performed. Further, the auxiliary optical member is particularly useful for a device having a small device configuration, such as the subjective optometry device in this embodiment. That is, for example, when the distance from the concave mirror 85 to the eye to be inspected is small, the change in the amount of aberration due to the correction power tends to be large. Therefore, by using the auxiliary optical member, it is better to correct the optical aberration that cannot be corrected by the correction means only by the correction optical system 90 alone.

Further, the present invention is not limited to this, and the control unit 70 may display the notification information based on the result of the determination process on the monitor 75. Here, when the notification information indicating that the auxiliary optical member is required is displayed, the examiner may be able to arrange the auxiliary optical member in the optical path of the subjective measurement optical system. In this case, the auxiliary lens may be attached to the subject. In this case, since the examiner can be notified of the necessity of the auxiliary optical member, the examiner can easily recognize the necessity of the auxiliary optical member and can suppress forgetting to use the auxiliary optical member. ..

In the above configuration, the optical aberration generated in the optical path of the measurement optical system is optically corrected by the correction optical system 90, but the present invention is not limited to this, and other correction processing may be performed. For example, the aberration of the measurement image of the objective measurement optical system 10 may be corrected according to the optical aberration generated in the optical path of the measurement optical system. Further, the objective value of the objective measurement optical system 10 may be corrected according to the optical aberration generated in the optical path of the measurement optical system.

The technique related to aberration correction in the present embodiment can also be applied to a subjective optometry apparatus that does not have an objective measuring means. Further, the technique related to aberration correction in the present embodiment includes, for example, a correction optical system having a right eye correction optical system and a left eye correction optical system provided in pairs on the left and right, and a right eye correction optical system. It is also applicable to a subjective optometry apparatus that does not have a concave mirror 85 shared by the optical path for the eye and the optical path for the left eye including the correction optical system for the left eye. That is, the technique related to the aberration correction in the present embodiment is a correction that is arranged in the optical path of the projection optical system that projects the target light beam toward the eye to be inspected and the optical path of the projection optical system to change the optical characteristics of the target light beam. It has an optical system and an optical member that guides the target light beam corrected by the correction optical system to the eye to be inspected and forms an image of the target light beam corrected by the correction optical system in front of the eye to be inspected. It can be applied to a subjective eye examination device including a subjective measurement means for subjectively measuring the optical characteristics of the eye to be inspected.

<Change of alignment tolerance>
The control unit 70 may set an alignment allowable range for determining the alignment state based on the optical power of refraction. For example, the control unit 70 measures the subjective eye refractive power based on the objective refractive power of the eye to be inspected (spherical power S, astigmatic power C, astigmatic axis angle A) obtained by the distance measurement of the objective power. The allowable alignment range for determining the alignment state between the eye to be inspected and the subjective measuring means at the time is set based on the optical power. In the following description, the setting of the alignment allowable range in the XY direction will be described, but the same setting is made in the alignment allowable range in the Z direction.

In the present embodiment, a configuration in which the alignment allowable range is changed by using the objective refractive power of the eye to be inspected acquired by the objective measuring means of the subjective eye inspection device 1 will be described as an example. Not limited to this. For example, it may be configured to receive and use the measurement results acquired by different objective measuring devices.

This will be described in more detail. For example, in this embodiment, the alignment tolerance is created for each spherical power. Of course, the alignment tolerance may be set based on the refractive power of the eye. For example, an alignment allowable range may be created for each astigmatic power and for each axial angle in consideration of the difference in astigmatic power and axial angle at each spherical power.

FIG. 11 is a diagram illustrating a change in the alignment allowable range. FIG. 11A shows an alignment tolerance in the case of 0 diopter (D). FIG. 11B shows an alignment tolerance when the value is 2.0D. FIG. 11C shows an alignment tolerance when the value is 5.0D. For example, the alignment allowable range is set according to the refractive power of the eye. For example, the alignment allowable range is calculated and set in advance by simulation, experiment, or the like. Of course, the alignment allowable range may be calculated and set before and after the alignment control according to the refractive power of the eye.

For example, the control unit 70 is set to reduce the alignment allowable range as the diopter value increases in the plus direction (plus side) or the minus direction (minus side) from 0D with reference to 0D. For example, as shown in FIG. 11B, the alignment tolerance A2 of 2.0D is set smaller than the alignment tolerance A1 of 0D in FIG. 11A. Further, for example, as shown in FIG. 11 (c), the alignment allowable range A3 of 5.0D is set to be even smaller than the alignment allowable range A2 of 2.0DD in FIG. 11 (b).

For example, in an eye to be inspected with a predetermined optical characteristic, the optical characteristic of the eye to be inspected is recognized by setting an alignment allowable range larger than an appropriate alignment range required for accurately acquiring measurement results. The accuracy of the measurement result is reduced when the measurement is performed. Further, for example, in an eye to be inspected having a predetermined optical characteristic, the optical characteristic of the eye to be inspected is set to be smaller than the appropriate alignment range required for accurately acquiring the measurement result. When consciously measuring, the alignment operation becomes difficult. The subjective optometry device 1 in the present embodiment includes a configuration in which the alignment allowable range is changed based on the optical power of refraction. As a result, when the optical characteristics of the eye to be inspected are subjectively measured, the optical characteristics of the eye to be inspected can be measured with high accuracy. Further, for example, when the optical characteristics of the eye to be inspected are subjectively measured, the alignment operation can be efficiently performed.

For example, the subjective optometry apparatus 1 in the present embodiment has a configuration in which the allowable alignment range is reduced when the diopter value increases in the positive direction or the negative direction with reference to 0 diopter. As a result, it is possible to prevent the accuracy of the measurement result from being lowered when the optical characteristics of the eye to be inspected are subjectively measured. Further, for example, when the diopter value is close to 0 diopter with reference to 0 diopter, the alignment operation becomes difficult when the optical characteristics of the eye to be inspected are subjectively measured by increasing the alignment allowable range. Can be suppressed.

The subjective eye examination device 1 in the present embodiment has a pair of left and right corrective optical systems for the right eye to be inspected and a corrective optical system for the left eye to be inspected, and is arranged in the optical path of the light projection optical system 30. It is provided with a correction optical system 60 that changes the optical characteristics of the optotype light beam. Further, the subjective optometry device 1 in the present embodiment is a concave mirror 85 shared by an optical path for the right eye including a corrective means for the right eye and an optical path for the left eye including a corrective means for the left eye, and is a concave mirror 85 for correcting optics. It is provided with a subjective measuring means having a concave mirror that guides the target light beam that has passed through the system 60 to the eye to be inspected and forms an image of the target light beam that has passed through the correction optical system 60 in front of the eye to be inspected. In such a subjective optometry apparatus according to the present embodiment, it is particularly useful to change the alignment tolerance based on the optical power of refraction. For example, when a corrective optical system is provided in front of the eye to be inspected and subjective measurement is performed by looking into the inspection window of the corrective optical system as in the conventional subjective measurement means, the inspection window is looked into. As a result, the position of the eye to be inspected does not shift significantly, so that the optical characteristics of the eye to be inspected can be measured with high accuracy. However, in a device provided with a subjective measuring means for measuring the refractive power of the eye to be inspected without arranging the correction optical system in front of the eye, such as the subjective eye-inspecting device 1 of the present embodiment, the position of the eye to be inspected is determined. Alignment operation is important because it may deviate significantly. For this reason, a subjective measuring means that measures the refractive power of the eye to be inspected without arranging the corrective optical system around the eye is an efficient alignment operation, especially when subjectively measuring the optical characteristics of the eye to be inspected. It is important to do. Further, in a device provided with a subjective measuring means for measuring the refractive power of the eye to be inspected without arranging the corrective optical system in front of the eye, the optics of the eye to be inspected are particularly measured when the optical characteristics of the eye to be inspected are subjectively measured. It is important to set the alignment tolerance for accurate measurement of characteristics.

The subjective optometry device 1 in the present embodiment has an objective measurement optical system 10 that emits measurement light to the fundus of the eye to be inspected and receives the reflected light, and objectively adjusts the optical characteristics of the eye to be inspected. It is equipped with an objective measuring means for measuring. Therefore, in the subjective optometry device 1 of the present embodiment, it is possible to acquire the optical refractive power based on the measurement result measured by the objective measuring means, and the alignment allowable range can be changed by one device. It can be possible. This makes it possible to accurately measure the optical characteristics of the eye to be inspected when subjectively measuring the optical characteristics of the eye to be inspected with a simple configuration. In addition, with a simple configuration, it is possible to efficiently perform an alignment operation when subjectively measuring the optical characteristics of the eye to be inspected.

The technique for changing the alignment tolerance in the present embodiment can also be applied to a subjective optometry apparatus that does not have an objective measuring means. Further, the technique for changing the alignment allowable range in the present embodiment is, for example, at least one of a correction optical system having a right eye correction optical system and a left eye correction correction optical system and a concave mirror 85 provided in pairs on the left and right. It can also be applied to a subjective optometry device that does not have a sword. That is, the technique for changing the alignment allowable range in the present embodiment is in the light projection optical system that projects the target light beam toward the eye to be inspected and in the optical path of the light projection optical system, and obtains the optical characteristics of the target light beam. It can be applied to any optometry device that has a changing orthodontic optical system and is provided with a conscious measuring means for consciously measuring the optical characteristics of the eye to be inspected.

The present invention is not limited to the apparatus described in the present embodiment. For example, the subjective optometry software (program) that performs the functions of the above-described embodiment is supplied to the system or device via a network or various storage media. Then, a system or a control device of the device (for example, a CPU or the like) can read and execute the program.

1 Subjective eye examination device 2 Housing 3 Presentation window 4 Monitor 5 Jaw stand 6 Base 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 optical system 60 Correction optical system 70 Control unit 72 Memory 81 Deflection mirror 84 Half mirror 85 Concave mirror 90 Correction optical system 100 Imaging optical system

Claims (3)

A projection optical system that projects the luminous flux from the display toward the eye to be inspected,
A corrective optical system having a pair of left and right corrective optical systems for the right eye and a corrective optical system for the left eye, arranged in the optical path of the projection optical system, and changing the optical characteristics of the target light beam,
A concave mirror shared by an optical path for the right eye including the correction optical system for the right eye and an optical path for the left eye including the correction optical system for the left eye, and the vision corrected by the correction optical system. By reflecting the target light beam in the direction of the eye to be inspected by the concave mirror, the target light beam is guided to the eye to be inspected, and the image of the target light beam corrected by the correction optical system is optically predetermined. A concave mirror that guides the eye to be inspected so as to have an examination distance,
An optometry device comprising a conscious measuring means for consciously measuring the optical characteristics of the eye to be inspected.
It has a pair of left and right measurement optical systems that emit measurement light from a measurement light source, which is a light source different from the display, to the fundus of the eye to be inspected and receive the reflected light by an imaging element, and is arranged in the optical path of the measurement optical system. It is an objective measuring means for objectively measuring the optical characteristics of the eye to be inspected through the concave mirror, and the optical refractive power of the eye to be inspected is determined by analyzing the imaging result by the imaging element. Equipped with an objective measuring means for objective measurement,
A subjective optometry apparatus characterized in that subjective measurement by the subjective measuring means and objective measurement by the objective measuring means are performed in an open state without arranging the corrective optical system in front of the eyes of a subject. In the subjective optometry device of claim 1,
The optical axis between the concave mirror and the eye to be inspected in the subjective measuring means and the optical axis between the concave mirror and the eye to be inspected in the objective measuring means are coaxial. A subjective optometry device characterized by. In the subjective optometry device of claim 1 or 2.
A deviation detecting means for detecting a displacement of the image of the correction optical system with respect to the eye to be inspected,
Deflection members arranged between the correction optical system and the eye to be inspected and provided in pairs on the left and right, respectively.
A driving means for driving the deflection member and
Based on the detection result detected by the deviation detecting means, the driving means is controlled, and the apparent luminous flux for guiding the image of the correction optical system to the eye to be inspected is deflected to form the image formation position. With a correction means that optically corrects
A subjective optometry device characterized by being equipped with.

Images