JP6771345B2 - Optometry device - Google Patents

Description

The present invention relates to an optometry device.

An optometry device is a device for inspecting visual acuity, visual function, etc. by presenting an optotype to an eye to be inspected through an optical element. Such an optometry device includes, for example, a measuring head and an optotype presenting device. The measuring head changes the optical element applied to the eye to be inspected. The optotype presenting device selectively presents an optotype such as a Randold ring.

For example, Patent Document 1 discloses an optometry device including a pair of left and right subjective examination units and a pair of left and right objective measurement units. The subjective examination unit is an examination unit for performing a subjective examination based on the response from the subject. The objective measurement unit is a measurement unit for acquiring information about the eye to be inspected mainly by using a physical method without referring to the response from the subject.

Japanese Unexamined Patent Publication No. 7-194542

However, in the method disclosed in Patent Document 1, when shifting from the distance examination to the near examination, the near eye is placed in front of the mirror member facing the optometry window of the subjective examination unit, and the left eye. The unit and the right eye unit are rotated to congest the eye to be inspected. As a result, it takes time to switch between the distance examination and the near examination, and the device is increased in size because a mechanism for rotating the left eye unit and the right eye unit is required.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a new technique for switching between a distance inspection and a near inspection in a short time while reducing the size of the device. That is.

The optometry apparatus according to the embodiment includes a correction optical system and an optotype presentation optical system. The orthodontic optical system includes one or more optical elements and can change the refractive power applied to the eye to be inspected. The optotype presenting optical system presents an optotype to the eye to be inspected. The optotype presenting optical system includes a display unit, a convex lens, and an optical member. The display unit displays the optotype. The convex lens is arranged between the display unit and the corrective optical system. The optical member is provided at a position between the display unit and the convex lens and at a position deviated from the optical axis of the optotype presenting optical system, and changes the focal position of the convex lens. The display unit displays one of the distance vision and the near vision at a position corresponding to the optical axis, and displays the other of the distance and near vision at a position corresponding to the optical member.

According to the present invention, it is possible to provide a new technique for switching between a distance inspection and a near inspection in a short time while reducing the size of the device.

It is the schematic which shows the structural example of the optical system of the optometry apparatus which concerns on embodiment. It is the schematic which shows the structural example of the optical system of the optometry apparatus which concerns on embodiment. It is the schematic which shows the structural example of the optical system of the optometry apparatus which concerns on embodiment. It is the schematic which shows the structural example of the optometry apparatus which concerns on embodiment. It is the schematic which shows the structural example of the optometry apparatus which concerns on embodiment. It is the schematic which shows the structural example of the information processing system of the optometry apparatus which concerns on embodiment. It is a flow chart which shows the operation example of the optometry apparatus which concerns on embodiment. It is the schematic which shows the structural example of the optical system of the optometry apparatus which concerns on the modification of embodiment.

An example of an embodiment of the optometry apparatus according to the present invention will be described in detail with reference to the drawings. In addition, the description contents of the document cited in this specification and any known technique can be incorporated into the following embodiments.

[Optometry device]
The optometry device according to the embodiment is a device capable of performing objective measurement and subjective examination. Objective measurement is to obtain information about the eye to be examined mainly by using a physical method without referring to the response from the subject. The objective measurement includes an objective measurement for measuring a value related to the eye to be inspected and an imaging for acquiring an image of the eye to be inspected. Such objective measurements include, for example, optical power measurement, corneal shape measurement, intraocular pressure measurement, fundus photography, OCT photography and OCT measurement using a technique of optical coherence tomography (hereinafter, OCT). OCT imaging includes acquisition of a tomographic image of the eye to be inspected, a frontal image, and a tomographic image in an arbitrary direction. OCT measurement includes measurement of layer thickness at an arbitrary part of the eye to be inspected, measurement of axial length, corneal thickness, anterior chamber depth, lens thickness, etc., and eyeball information representing the structure of the eye to be inspected is acquired. .. The eyeball information shall include an intraocular distance indicating the distance between two predetermined parts in the eye such as the axial length and the thickness of the crystalline lens. However, the configuration of the optometry device according to the embodiment is not limited to this.

The subjective test obtains the result based on the response from the subject. The subjective test includes, for example, a subjective refraction test such as a distance test, a near test, a contrast test, and a glare test, and a visual field test. In the subjective test, information (such as a target) is presented to the subject, and the result is acquired based on the subject's response to the information.

Hereinafter, a case where the optometry device according to the embodiment is a non-wearable optometry device capable of performing at least one of an arbitrary subjective test and an arbitrary objective measurement will be described, but it may be a wearable optometry device. .. Non-wearable optometry devices include stationary optometry devices, portable optometry devices, and the like. The optometry apparatus according to the embodiment can perform a distance test and a near test as a subjective test, and can measure an optical power as an objective measurement.

<Composition>
1 to 5 show a schematic view of a configuration example of the optometry apparatus according to the embodiment. FIG. 1 schematically shows the configuration of an optical system when the optometry apparatus according to the embodiment is viewed from above. 2A, 2B, 3 and 4 show a schematic diagram of the configuration of the orthodontic optical system according to the embodiment. FIG. 5 shows a schematic diagram of a configuration example of an information processing system of the optometry apparatus according to the embodiment. In the following, the horizontal direction (horizontal direction) is the X direction, the vertical direction (vertical direction) is the Y direction, and the direction orthogonal to both the X direction and the Y direction is the Z direction.

The eye examination device 1 according to the embodiment includes a left eye examination unit LU, a right eye examination unit RU, and a nose pad 3. The left eye examination unit LU accommodates a left eye examination optical system for performing subjective examination and objective measurement on the left eye examination EL of the subject. The right eye examination unit RU houses a right eye examination optical system for performing subjective examinations and objective measurements on the right eye examination ER of the subject. The left eye examination optical system and the right eye examination optical system are symmetrically configured. The left eye examination unit LU can be moved in the X direction by the moving mechanism ULD described later. The right eye examination unit RU can move in the X direction independently of the left eye examination unit LU by the movement mechanism URD described later. Thereby, the distance in the X direction between the left eye examination unit LU (optometry window) and the right eye examination unit RU (optometry window) can be changed according to the interpupillary distance of the subject. The nose pad 3 is brought into contact with the nose Ns of the subject (for example, the side surface of the back of the nose and the upper part of the ala of nose). The eye examination device 1 performs a subjective test or eye refractive power measurement on the left eye EL to be inspected by the left eye examination optical system and a right eye examination optical system for the subject whose nose Ns is in contact with the nose pad 3. A subjective test for the optometry ER or an optical power measurement can be performed at the same time.

A housing installed on an installation table such as an eye examination table accommodates the left eye examination unit LU and the right eye examination unit RU, so that the housing can support the left eye examination unit LU and the right eye examination unit RU. It is possible. In this case, the nose pad 3 is provided in the housing. The nose pad 3 may include a pad to which the nose of the subject is in contact, and a clings whose one end is fixed to the housing and the other end is fixed to the pad.

Further, the left eye examination unit LU and the right eye examination unit RU may be supported from above by the arm member. In this case, the nose pad 3 is provided on the arm member. The nose pad 3 may include a pad to which the nose of the subject is abutted and a clings whose one end is fixed to the arm member and the other end is fixed to the pad.

The left eye examination unit LU includes a correction optical unit U1L and a measurement optical unit U2L. The corrective optical unit U1L accommodates an optometry window 11L, corrective optical systems 12L and 13L, and a turret plate rotation mechanism 12LD described later. As will be described later, the measurement optical unit U2L accommodates the optotype display optical system 20L and the refractive power measurement optical system 30L. The left eye examination optical system is composed of an optical system housed in the correction optical unit U1L and an optical system housed in the measurement optical unit U2L.

The right eye examination unit RU includes a correction optical unit U1R and a measurement optical unit U2R. The corrective optical unit U1R accommodates an optometry window 11R, corrective optical systems 12R and 13R, and a turret plate rotation mechanism 12RD described later. The measurement optical unit U2R accommodates the optotype display optical system 20R and the refractive power measurement optical system 30R. The right eye examination optical system is composed of an optical system housed in the correction optical unit U1R and an optical system housed in the measurement optical unit U2R.

Since the left eye examination optical system and the right eye examination optical system are configured symmetrically, the corresponding parts are given the same code, and the parts that make up the left eye examination optical system are marked with "" at the end of the code. An "L" shall be added, and an "R" shall be added to the end of the code or the like in the portion constituting the right eye examination optical system. In the following, unless otherwise specified, the left eye examination optical system will be described, and the description of the right eye examination optical system will be omitted as appropriate.

(Correcting optical unit)
As described above, the correction optical unit U1L includes an optometry window 11L, correction optics 12L and 13L, and a turret plate rotation mechanism 12LD (see FIG. 5).

The corrective optical system 12L is an optical system that includes one or more optical elements and can change the refractive power applied to the left eye subject EL in the first step (for example, 3D (diopter) step). In this embodiment, in the correction optical system 12L (12R), two or more optometry lenses having different refractive powers are arranged, and the position of the rotation axis CL (CR) substantially parallel to the optical axis of the correction optical system 12L (12R). Includes turret plates 121L, 122L (121R, 122R) that are rotatable around the lens. The turret plate 121L is arranged on the left side of the eye to be inspected EL with respect to the turret plate 122L. The turret plates 121L and 122L are independently rotated about the rotation shaft CL by the turret plate rotation mechanism 12LD. Thereby, two or more optometry lenses can be selectively applied to the left optometry EL.

As shown in FIG. 2A, the hole HL1 and the optometry lenses TL1 to TL3 are arranged on the turret plate 121L in the circumferential direction centered on the rotation axis CL. As shown in FIG. 2B, the hole HL2 and the optometry lenses TL4 to TL6 are arranged on the turret plate 122L in the circumferential direction centered on the rotation axis CL. The optometry lenses are arranged on the turret plates 121L and 122L so that the refractive power of the optometry lens arranged on the turret plate 122L does not exceed the refractive power of the optometry lens arranged on the turret plate 121L. For example, the optometric lenses TL1 to TL3 on the turret plate 121L each have a refractive power of -6D, -12D, and -9D, and the optometric lenses TL4 to TL6 on the turret plate 122L, respectively, of -3D, + 6D, and + 3D. Has refractive power. As a result, it is possible to improve the accuracy of the refractive power at a position separated by a predetermined corneal apex distance (for example, 12 mm or 15 mm) from the left eye EL of the subject in which the nose Ns abuts on the nose pad 3. By independently rotating the turret plates 121L and 122L around the rotation axis CL by the turret plate rotation mechanism 12LD, the refractive power applied to the left eye subject EL is measured in 3D between -15D and 6D in a 3D measurement step. Can be changed. As will be described later, the optotype presenting optical system 20L can change the refractive power applied to the left eye EL to be inspected in a measurement step smaller than the 3D measurement step (for example, a 0.25D measurement step). As a result, a desired refractive power can be applied to the left optometry EL within a predetermined range while significantly reducing the types of optometry lenses.

At least one of the optometry lenses TL1 to TL6 arranged on the turret plates 121L and 122L may be removable. In this case, it is possible to newly attach an optometry lens having a refractive power different from that of the optometry lenses TL1 to TL6 to the attachment portion of the optometry lens removed from the turret plate. Thereby, it is possible to widen or narrow the range of change of the refractive power applied to the left eye subject EL. In particular, by mounting an optometry lens having a refractive power stronger than -12D on the mounting portion, the refractive power applied to the left eye subject EL can be changed in a range wider than -15D to 6D.

By changing the refractive power applied to the left optometry EL in the coarse measurement step, the number of optometry lenses arranged on the turret plates 121L and 122L can be reduced. In this embodiment, the optometry lenses TL1 to TL6 may be large-diameter refracting lenses having a diameter of 24 mm or more. As a result, it becomes possible to use an optometry lens with less distortion even when the refractive power is strong, and it is possible to perform a subjective examination using an optometry lens close to the lens of the spectacles actually worn. Become. Further, by using a large-diameter optometry lens, it becomes possible to perform a highly accurate subjective examination under conditions close to the wearing state of spectacles even outside the axis of the optical axis of the correction optical system 12L as described later. Further, since the subjective test can be performed with a long progressive band length, the subjective test can be performed under conditions close to the state in which the progressive glasses are actually worn.

The correction optical system 13L is an optical system for correcting astigmatism and strabismus of the left eye subject EL. For example, the correction optical system 13L includes two cylindrical lenses that can rotate about the optical axis of the correction optical system 13L, and a lens rotation mechanism 131LD (described later) that independently rotates these two cylindrical lenses. .. The two cylindrical lenses are arranged so that the lens axis parallel to the cylindrical axis is orthogonal to the optical axis of the correction optical system 13L. Astigmatism of the left eye subject EL is corrected by relatively rotating the two cylindrical lenses by the lens rotation mechanism 131LD.

Further, for example, the straightening optical system 13L includes two wedge prisms that can rotate around the optical axis of the straightening optical system 13L, and a prism rotating mechanism 132LD (described later) that independently rotates these two wedge prisms. including. The wedge prism includes a parallel surface arranged so as to be orthogonal to the optical axis of the correction optical system 13L, and an optical surface provided so as to form a predetermined declination with respect to the parallel surface. The two wedge prisms are arranged so that their parallel planes face each other and the lens axis substantially coincides with the optical axis of the correction optical system 13L. The strabismus of the left eye subject EL is corrected by independently rotating the two wedge prisms with the prism rotation mechanism 132LD.

The corrective optical system 12L includes, for example, a variable refractive power lens such as a liquid lens, and the refractive power applied to the left eye subject EL may be changed by the variable refractive power lens. As a result, the number of optometric lenses accommodated in the orthodontic co-educational system 12L can be reduced. The correction optical system 13L includes, for example, a variable refractive power lens such as a liquid lens, and the astigmatism and strabismus of the left eye subject EL may be corrected by the variable refractive power lens.

As shown in FIG. 3, the optical axes O1L of the correction optical systems 12L and 13L are tilted downward by a predetermined forward tilt angle θ _{1 with} respect to the optical axis O2L of the optotype display optical system 20L toward the LCD 23L described later. be able to. The forward tilt angle θ ₁ corresponds to the angle at which the lens of the spectacles is tilted in the vertical direction with respect to the visual axis when the subject wearing the spectacles faces straight ahead. For example, θ ₁ may be any of approximately 8 degrees, 10 degrees to 15 degrees, 20 to 25 degrees, and 15 degrees to 20 degrees. The anteversion angle θ ₁ may be common to the left eye examination unit LU and the right eye examination unit RU, or may be different from each other. In embodiments, correction optical system 12L, the optical axis O1L corrective optical unit U1L housing the 13L, inclined by the front inclined angle theta ₁ downward toward the LCD23L respect to the optical axis O2L measuring optical unit U2L .. As a result, the subjective test can be performed under conditions close to those in which the glasses are worn.

The anteversion angle θ ₁ may be changed in common for the left eye examination unit LU and the right eye examination unit RU, or may be changed independently of each other. In this case, the forward tilt angle θ ₁ may be changed according to the type of subjective examination. For example, the left eye examination unit LU may include a forward tilt angle changing mechanism for changing the vertical angle of the optical axes O1L of the correction optical systems 12L and 13L with respect to the optical axis O2L of the optotype presenting optical system 20L. The forward tilt angle changing mechanism may be a known rotation mechanism that rotates at least one of the correction optical unit U1L and the measurement optical unit U2L about an axis in the X direction. The forward tilt angle changing mechanism may tilt the optical axis O2L with respect to the optical axis O1L by tilting the measurement optical unit U2L in the vertical direction with respect to the fixed correction optical unit U1L. Further, the forward tilt angle changing mechanism may tilt the optical axis O2L with respect to the optical axis O1L by tilting the correction optical unit U1L in the vertical direction with respect to the fixed measurement optical unit U2L.

As shown in FIG. 4, the optical axes O1L of the correction optical systems 12L and 13L are tilted outward by a predetermined warp angle θ _{2 with} respect to the optical axis O2L of the optotype display optical system 20L toward the LCD 23L described later. ing. The warp angle θ ₂ corresponds to an angle at which the lens of the spectacles is tilted in the left-right direction with respect to the visual axis when the subject wearing the spectacles faces directly in front of the subject. For example, θ ₂ may be 5 to 10 degrees. The warp angle θ ₂ may be common to the left eye examination unit LU and the right eye examination unit RU, or may be different from each other. In the embodiment, the optical axis O1L of the correction optical unit U1L accommodating the correction optical systems 12L and 13L is inclined outward by a warp angle θ _{2 with} respect to the optical axis O2L of the measurement optical unit U2L toward the LCD 23L. .. Further, the optical axis O1R of the correction optical unit U1R accommodating the correction optical systems 12R and 13R is inclined outward by a warp angle θ _{2 with} respect to the optical axis O2R of the measurement optical unit U2R toward the LCD 23R. As a result, the subjective test can be performed under conditions close to those in which the glasses are worn.

The warp angle θ ₂ may be changed in common for the left eye examination unit LU and the right eye examination unit RU, or may be changed independently of each other. For example, the left eye examination unit LU may include a warp angle changing mechanism for changing the horizontal angle of the optical axes O1L of the correction optical systems 12L and 13L with respect to the optical axis O2L of the optotype presenting optical system 20L. Similarly, the right eye examination unit RU may include a warp angle changing mechanism for changing the horizontal angle of the optical axes O1R of the correction optical systems 12R and 13R with respect to the optical axis O2R of the optotype presenting optical system 20R. The warp angle changing mechanism may be a known rotation mechanism that rotates the correction optical unit U1L about an axis in the Y direction.

Further, the left eye examination unit LU may include a rotation mechanism that rotates the optotype presenting optical system 20L relative to the correction optical systems 12L and 13L around the eyeball rotation point of the left eye examination EL. The rotation mechanism may rotate the measurement optical unit U2L relative to the correction optical unit U1L around the eyeball rotation point of the left eye subject EL. This rotation mechanism may be a mechanism provided separately from the above-mentioned warp angle changing mechanism, or may be a mechanism provided in common with the above-mentioned warp angle changing mechanism. Similarly, the right eye examination unit RU may include a rotation mechanism that rotates the optotype presenting optical system 20R relative to the correction optical systems 12R and 13R around the eyeball rotation point of the right eye examination ER. .. By providing such a rotation mechanism, subjective examination and objective measurement can be performed according to the visual axis of the eye to be inspected, and subjective examination and objective measurement can be performed while guiding the direction of the visual axis of the eye to be inspected to a desired direction. It becomes possible to do.

(Measuring optical unit)
As described above, the measurement optical unit U2L accommodates the optotype display optical system 20L and the refractive power measurement optical system 30L.

The optotype presenting optical system 20L presents an optotype to the left eye subject EL. The optotype presentation optical system 20L can present a distance optotype for performing a distance examination and a near vision target for performing a near examination side by side to the left eye EL to be inspected. The optotype display optical system 20L includes a beam splitter BS1L, an imaging lens 21L, a rod glass 22L, and an LCD 23L. In FIG. 1, the outline of the optotype displayed on the LCD 23L is illustrated.

The imaging lens 21L includes a convex lens arranged between the LCD 23L and the beam splitter BS1L (or correction optical systems 12L, 13L). The focal length of the imaging lens 21L is determined according to the size of one pixel of the LCD 23L. When the LCD 23L is a microdisplay having a pixel size of 0.0096 mm × 0.0096 mm, the focal length f of the imaging lens 21L may be 66 mm. Assuming that the size of the cut of the Randold ring optotype corresponding to the visual acuity of 2.0 in a 5 m eye examination (distance examination) in which the examination distance is 5 m is the size of one pixel, the focal length f [mm] of the imaging lens 21L is given by the following equation. Obtained from (1). In the equation (1), the viewing angle θ = 0.5'.

For example, when the LCD 23L is a microdisplay having a resolution of 1280 pixels × 720 pixels or more and the diagonal length of the display area is less than 1 inch, considering the variation in the size of one pixel of the microdisplays of a plurality of manufacturers. The focal length f of the imaging lens 21L may be included in the range of 50 mm to 80 mm.

The imaging lens 21L may be movable in the optical axis direction of the optotype display optical system 20L by the lens moving mechanism 21LD described later. The lens moving mechanism 21LD receives control from a control unit described later, and corresponds to a measurement step smaller than the 3D measurement step (for example, a 0.25D measurement step). It moves in the optical axis direction of the system 20L. Thereby, the refractive power applied to the left eye EL to be inspected can be changed in a small measurement step.

The rod glass 22L is an optical member that changes the focal position of the imaging lens 21L. By presenting the optotype to the left eye EL through the rod glass 22L or by presenting the optotype without passing through the rod glass 22L, it is possible to perform subjective tests at different inspection distances. The rod glass 22L is provided at a position between the LCD 23L and the imaging lens 21L and at a position deviating from the optical axis of the optotype display optical system 20L. The rod glass 22L is a parallel plane member in which the end face on the LCD 23L side and the end face on the imaging lens 21L side are substantially parallel. The rod glass 22L is arranged in the nasal direction of the subject with respect to the optical axis of the optotype display optical system 20L. Further, the rod glass 22L is arranged below the optical axis of the optotype display optical system 20L.

The near vision examination is possible by presenting the near vision target to the left eye subject EL through the rod glass 22L. The length d in the optical axis direction of the optotype display optical system 20L of the rod glass 22L is determined according to the inspection distance. In this embodiment, when a near vision target is presented to the left eye subject EL through the rod glass 22L in a 0.25 m eye examination (near examination) in which the examination distance is 0.25 m, the length d = 48.612 (mm). ). The length d can be determined as follows.

When the rod glass 22L is inserted, the focal length of the imaging lens 21L is increased by ΔL (mm). Assuming that the refractive index of the rod glass 22L is n, ΔL is expressed by the equation (2).

On the other hand, the movement amount ΔM (mm) of the imaging lens 21L (focal length f) for 1D required for the focus adjustment by inserting the rod glass 22L is expressed by the equation (3).

The amount of focus adjustment required for switching between 5 m and 0.25 m optometry corresponds to the product (= ΔK × ΔM) of the refractive power ΔK corresponding to the difference in the inspection distance and the movement amount ΔM obtained by the equation (3). To do. Make this focus adjustment amount equal to the above ΔL. Therefore, ΔL is expressed by the equation (4).

Assuming that the refractive index n of the rod glass 22L is 1.51633, the length d of the rod glass 22L d = 48.612 (mm) can be obtained from the equations (1) and (4).

The rod glass 22L may be inserted and removed between the beam splitter BS1L and the LCD 23L depending on the type of subjective examination.

The LCD 23L can display a far-distance optotype, a near-distance optotype, or both a distance-distance optotype and a near-distance optotype under the control of a control unit described later. For example, the LCD 23L displays one of the distance optotype and the near vision at a position corresponding to the optical axis of the optotype display optical system 20L, and the distance optotype and the near vision are located at a position corresponding to the rod glass 22L. Display the other of the optics. In this embodiment, the LCD 23L displays the distance optotype at a position corresponding to the optical axis of the optotype display optical system 20L, and displays the near vision at a position corresponding to the rod glass 22L. The position corresponding to the optical axis in the LCD 23L includes a position where the optical axes intersect or a vicinity thereof in the display area of the LCD 23L. The position corresponding to the rod glass 22L in the LCD 23L includes a position where the axes of the rod glass 22L in the optical axis direction intersect or a vicinity thereof in the display area of the LCD 23L.

The LCD 23L can be moved in the optical axis direction of the optotype presenting optical system 20L by the optotype moving mechanism 23LD described later. The optotype movement mechanism 23LD receives control from a control unit described later, and displays the LCD 23L in the optotype display optical system 20L in a movement step corresponding to a measurement step smaller than the 3D measurement step (for example, a 0.25D measurement step). Move in the optical axis direction. For example, the optometric moving mechanism 23LD moves the LCD 23L in the optical axis direction of the optometric display optical system 20L in units of ΔM × 0.25D = 1.089 (mm) using ΔM of the equation (3). , The refractive power applied to the left eye EL can be changed in the measurement step of 0.25D.

The LCD 23L is a micro display as described above. As a result, the size of the optotype display optical system 20L, which can switch between the distance inspection and the near inspection in a short time, can be reduced.

The beam splitter BS1L is an optical path synthesis member that forms a composite optical path between the optical path of the optotype display optical system 20L and the optical path of the refractive power measurement optical system 30L described later.

In the optometry display optical system 20L as described above, the distance optotype displayed on the LCD 23L passes through the imaging lens 21L without passing through the rod glass 22L, passes through the beam splitter BS1L, and passes through the beam splitter BS1L, and the correction optical system 13L. , 12L, passes through the optometry window 11L, and is presented to the left optometry EL. The near-vision target displayed on the LCD 23L passes through the rod glass 22L, the imaging lens 21L, the beam splitter BS1L, the correction optics 13L, 12L, and the optometry window 11L, and the left cover. It is presented to the optometry EL. As a result, it is possible to switch between a distance examination using a distance vision target and a near vision examination using a near vision target simply by switching the direction of the line of sight of the left eye subject EL.

(Optical power measurement optical system)
The refractive power measurement optical system 30L objectively measures the refractive power of the left eye subject EL. The refractive power measurement optical system 30L includes a light source 31L, a collimator lens 32L, a beam splitter BS2L, a mask plate 33L, and an image sensor 34L. A predetermined transmission pattern is formed on the mask plate 33L. The part other than the transmission pattern is a light-shielding part.

The light source 31L is a point light source that emits infrared light. The collimator lens 32L converts infrared light from the light source 31L into parallel light. The infrared light converted into parallel light by the collimator lens 32L passes through the beam splitter BS2L and is reflected by the beam splitter BS1L toward the left eye EL. The infrared light reflected by the beam splitter BS1L passes through the correction optical systems 13L and 12L, passes through the optometry window 11L, and is projected onto the left optometry EL. The return light of infrared light from the left optometry EL passes through the optometry window 11L, passes through the correction optics 12L and 13L, is reflected by the beam splitter BS1L, and is reflected by the beam splitter BS2L toward the mask plate 33L. To. The return light reflected by the beam splitter BS2L is projected onto the mask plate 33L. The return light transmitted through the transmission pattern formed on the mask plate 33L is projected onto the image pickup surface of the image pickup device 34L. The eye examination device 1 obtains the refractive power of the left eye to be inspected EL by analyzing the pattern image acquired by the image sensor 34L by the arithmetic processing unit 110 described later by a known method. The obtained refractive power may also be used to determine whether or not an image is formed on the retina through the correction optical systems 12L and 13L.

The configuration of the refractive power measurement optical system 30L according to the embodiment is not limited to the configuration shown in FIG. The configuration of the refractive power measurement optical system 30L according to the embodiment may be, for example, the configuration disclosed in Japanese Patent No. 3071693.

(Information processing system)
FIG. 5 shows an example of the functional configuration of the information processing system of the optometry device 1. The information processing system includes a control unit 100, an arithmetic processing unit 110, a display unit 120, and an operation unit 130. The control unit 100 includes an arithmetic processing unit 110, correction optical systems 12L, 13L, 12R, 13R, optotype display optical systems 20L, 20R, refractive power measurement optical systems 30L, 30R, moving mechanisms ULD, URD, and display unit 120. Control.

The control unit 100 has a main control unit 101 and a storage unit 102. The control unit 100 includes, for example, a microprocessor, a RAM (Random Access Memory), a ROM (Read Only Memory), a hard disk drive, and the like.

The main control unit 101 controls the optometry device 1 in various ways. In particular, the main control unit 101 has a turret plate rotation mechanism 12LD, a lens rotation mechanism 131LD, a prism rotation mechanism 132LD, a lens movement mechanism 21LD, an LCD 23L, an optotype movement mechanism 23LD, and a light source 31L for the left eye examination unit LU. It controls the image pickup element 34L, the moving mechanism ULD, and the like.

The moving mechanism ULD moves the left eye examination unit LU in the X direction (left-right direction). The moving mechanism URD moves the right eye examination unit RU in the X direction. By moving the left eye examination unit LU and the right eye examination unit RU in the X direction by the moving mechanisms ULD and URD, the left eye examination unit LU and the right eye examination unit RU are arranged according to the interpupillary distance of the subject. It is possible. The moving mechanism ULD is provided with an actuator that generates a driving force for moving the moving mechanism ULD and a transmission mechanism that transmits this driving force to a holding member that holds the left eye examination unit LU. The actuator receives a control signal from the control unit 100 and generates a driving force corresponding to the control signal. The actuator is composed of, for example, a pulse motor. The transmission mechanism is composed of, for example, a combination of gears or a rack and pinion. The same applies to the moving mechanism URD.

The main control unit 101 receives the user's operation on the operation unit 130 and controls the movement mechanisms ULD and URD to arrange the left eye examination unit LU and the right eye examination unit RU according to the interpupillary distance of the subject. It is possible to do. Further, the main control unit 101 controls the movement mechanisms ULD and URD based on the position of the pupil of the left eye subject EL and the position of the pupil of the right eye examination ER, so that the main control unit 101 is left according to the interpupillary distance of the subject. An eye examination unit LU and a right eye examination unit RU may be arranged. In this case, for each of the left eye test EL and the right eye test ER, two or more cameras are provided that substantially simultaneously capture the anterior segment of the eye to be inspected from different directions. The main control unit 101 analyzes the images of the anterior segment obtained by these cameras, causes the arithmetic processing unit 110 to specify the positions of the pupils of the left eye test EL and the right eye test ER, and based on the specified positions. Controls the movement mechanisms ULD and URD. The main control unit 101 controls the movement mechanisms ULD and URD based on the analysis result of the anterior segment image, so that the eye to be inspected and the optical system can be used not only in the X direction but also in at least one direction in the Y direction and the Z direction. May be aligned.

Further, the moving mechanisms ULD and URD may manually move the left eye examination unit LU and the right eye examination unit RU.

Further, the moving mechanism ULD may include at least one of the above-mentioned forward tilt angle changing mechanism and the warp angle changing mechanism. The moving mechanism ULD receives control from the control unit 100 and changes the forward tilt angle and the warp angle.

The turret plate rotation mechanism 12LD has an actuator that generates a driving force for rotating the turret plates 121L and 122L, and a transmission that transmits this driving force to a holding member that rotatably holds the turret plates 121L and 122L. A mechanism is provided. The actuator receives a control signal from the control unit 100 and generates a driving force corresponding to the control signal. The actuator is composed of, for example, a pulse motor. The transmission mechanism is composed of, for example, a combination of gears or a rack and pinion. The same applies to the turret plate rotating mechanism 12RD. Further, the lens rotation mechanisms 131LD and 131RD and the prism rotation mechanisms 132LD and 132RD are also provided with an actuator and a transmission mechanism.

The lens moving mechanism 21LD moves the imaging lens 21L in the optical axis direction of the optotype display optical system 20L. The lens moving mechanism 21RD moves the imaging lens 21R in the optical axis direction of the optotype display optical system 20R. The lens moving mechanism 21LD is provided with an actuator that generates a driving force for moving the imaging lens 21L and a transmission mechanism that transmits this driving force to a holding member that holds the imaging lens 21L. The actuator receives a control signal from the control unit 100 and generates a driving force corresponding to the control signal. The same applies to the lens moving mechanism 21RD.

The optotype moving mechanism 23LD moves the LCD 23L in the optical axis direction of the optotype presenting optical system 20L. The optotype moving mechanism 23RD moves the LCD 23R in the optical axis direction of the optotype presenting optical system 20R. The optotype moving mechanism 23LD is provided with an actuator that generates a driving force for moving the LCD 23L and a transmission mechanism that transmits this driving force to a holding member that holds the LCD 23L. The actuator receives a control signal from the control unit 100 and generates a driving force corresponding to the control signal. The same applies to the optotype moving mechanism 23RD.

The main control unit 101 can change the refractive power applied to the left eye subject EL by executing coordinated control of the turret plate rotation mechanism 12LD and the optotype movement mechanism 23LD. For example, the main control unit 101 controls the optotype moving mechanism 23LD while controlling the turret plate rotating mechanism 12LD to change the refractive power applied to the left eye subject EL in the 3D measurement step, and controls 0.25D. The refractive power applied to the left eye EL to be inspected is changed in the measurement step of. Specifically, the main control unit 101 controls the turret plate rotation mechanism 12LD to change the refractive power by + 3D, and then controls the optotype moving mechanism 23LD to change the refractive power by + 0.25D. repeat. That is, the LCD 23L is repeatedly moved by + 0.25D with respect to the initial position. When the main control unit 101 repeats the change of + 0.25D 12 times, it controls the turret plate rotation mechanism 12LD to further change the refractive power by + 3D, and controls the optotype moving mechanism 23LD to return the LCD 23L to the original initial stage. After returning to the position, the refractive power is repeatedly changed by + 0.25D.

The main control unit 101 may change the refractive power applied to the left eye subject EL by executing coordinated control of the turret plate rotation mechanism 12LD and the lens moving mechanism 21LD. In this case, similarly to the above, the main control unit 101 controls the lens moving mechanism 21LD while controlling the turret plate rotating mechanism 12LD and changing the refractive power applied to the left eye subject EL in the 3D measurement step. Then, in the measurement step of 0.25D, the refractive power applied to the left eye subject EL is changed.

Further, the main control unit 101 controls the liquid lens provided in the correction optical system 13L while controlling the turret plate rotation mechanism 12LD to change the refractive power applied to the left eye subject EL in the 3D measurement step. Then, in the measurement step of 0.25D, the refractive power applied to the left eye subject EL may be changed. Further, even if the main control unit 101 changes the refractive power applied to the left eye subject EL by executing coordinated control with respect to the turret plate rotation mechanism 12LD, the optotype moving mechanism 23LD, and the lens moving mechanism 21LD. Good.

Similar to the control for the left eye examination unit LU, the main control unit 101 has the turret plate rotation mechanism 12RD, the lens rotation mechanism 131RD, the prism rotation mechanism 132RD, the lens movement mechanism 21RD, and the LCD23R for the right eye examination unit RU. It controls the optotype moving mechanism 23RD, the light source 31R, the image pickup element 34R, the moving mechanism URD, and the like.

By controlling the image pickup devices 34L and 34R, the main control unit 101 takes in the acquired signal and causes the arithmetic processing unit 110 to perform analysis processing and the like.

Further, the main control unit 101 performs a process of writing data to the storage unit 102 and a process of reading data from the storage unit 102.

The storage unit 102 stores various types of data. The data stored in the storage unit 102 includes, for example, various measurement results, eye examination information, and the like. The eye test information includes information about the subject such as the patient ID and name, and information about the test eye such as left eye / right eye identification information. Further, various programs and data for operating the optometry device 1 are stored in the storage unit 102.

The arithmetic processing unit 110 receives control from the control unit 100 and executes a predetermined analysis process or the like. The arithmetic processing unit 110 includes a refractive power calculation unit 111. The refractive power calculation unit 111 analyzes an image based on the return light projected on the imaging surface of the imaging elements 34L and 34R obtained by the refractive power measuring optical systems 30L and 30R, thereby analyzing the left eye subject EL and the right eye subject. Find the refractive power of each ER. For example, the refractive power calculation unit 111 obtains the refractive power by analyzing the size, shape, distribution, and the like of the image based on the return light by a known analysis process.

The display unit 120 displays various information under the control of the control unit 100. The operation unit 130 is used to operate the optometry device 1. The operation unit 130 includes various hardware keys (joysticks, buttons, switches, etc.) provided in the optometry device 1. Further, the operation unit 130 may include various software keys (buttons, icons, menus, etc.) displayed on the touch panel type display screen. At least a part of the display unit 120 and the operation unit 130 may be integrally configured. A typical example is a touch panel type display screen.

Further, the optometry device 1 may include a communication unit. The communication unit has a function for communicating with an external device (not shown). The communication unit has a configuration according to the form of communication with the external device. The external device may be any other ophthalmic device. Further, the external device may be a device (reader) having a function of reading information from the recording medium or a device (writer) having a function of writing information to the recording medium. Another example of an external device is a computer used in the medical institution. Such in-hospital computers include, for example, a hospital information system (HIS) server, a DICOM (Digital Imaging and Communications in Medicine) server, a doctor's terminal, and the like. The external device may include a computer used outside the medical institution. Such out-of-hospital computers include, for example, mobile terminals, personal terminals, servers and terminals on the manufacturer side of the optometry device 1, cloud servers, and the like.

The optometry lens is an example of an "optical element" included in the orthodontic optical system according to the embodiment. The LCDs 23L and 23R are examples of the "display unit" according to the embodiment. The imaging lenses 21L and 21R are examples of the "convex lens" according to the embodiment. The rod glasses 22L and 22R are examples of the "optical member" according to the embodiment. The housing accommodating the left eye examination unit LU and the right eye examination unit RU or the arm member that supports the left eye examination unit LU and the right eye examination unit RU from above is an example of the "support member" according to the embodiment.

<Operation example>
An operation example of the optometry apparatus 1 according to the embodiment will be described.

FIG. 6 shows a flow chart of an operation example of the optometry device 1 according to the embodiment.

(S1)
First, after the nose Ns of the subject is brought into contact with the nose pad 3 provided in the eye examination device 1, the main control unit 101 controls the movement mechanisms ULD and URD as described above to control the subject's nose Ns. The left eye examination unit LU and the right eye examination unit RU are arranged based on the nose pad 3 according to the interpupillary distance. As a result, the left optometry EL is arranged at a position where the optotype is presented through the optometry window 11L, and the right eye ER is arranged at a position where the optotype is presented through the optometry window 11R.

Further, the main control unit 101 presents a red instillation target to the left eye subject EL by displaying a red instillation target at a predetermined display position of the LCD 23L, and green instillation at a predetermined display position of the LCD 23R. By displaying the marker, a green optotype is presented to the right eye examination ER, and the movement mechanisms ULD and URD are controlled so that the red optotype and the green optotype overlap, and the left eye examination unit LU And the right eye examination unit RU may be arranged. Thereby, the left eye examination unit LU and the right eye examination unit RU can be arranged so that the subject is fused. The display position of the optotype on the LCD 23L may be substantially the same as the display position of the optotype on the LCD 23R.

(S2)
The main control unit 101 waits for a user's predetermined operation input to the operation unit 130 (step S2: N). When a predetermined operation is performed on the operation unit 130 (step S2: Y), the operation of the optometry device 1 shifts to S3.

Further, a sensor for detecting that the nose Ns of the subject is in contact with the nose pad 3 is provided, and the main control unit 101 shifts the operation of the optometry device 1 to S3 based on the detection result of this sensor. May be good.

(S3)
When a predetermined operation is performed on the operation unit 130 (step S2: Y), the main control unit 101 causes both the left eye test EL and the right eye test ER to perform objective measurement. Specifically, the main control unit 101 controls the light sources 31L and 31R to emit infrared light, and outputs an image based on the return light of the infrared light acquired by the image sensor 34L and 34R to the arithmetic processing unit 110. Let it be analyzed. In the arithmetic processing unit 110, the refractive power calculation unit 111 performs a known analysis process on the image based on the return light to perform the refractive power (objective measurement value) of the left eye subject EL and the refraction of the right eye test ER. Seeking power.

(S4)
The main control unit 101 controls the turret plate rotation mechanism 12LD, the lens rotation mechanism 131LD, and the prism rotation mechanism 132LD so as to reproduce the refractive power of the left eye subject EL obtained in S3. If necessary, the main control unit 101 may control the lens moving mechanism 21LD and the optotype moving mechanism 23LD. Similarly, the main control unit 101 controls the turret plate rotation mechanism 12RD, the lens rotation mechanism 131RD, and the prism rotation mechanism 132RD so as to reproduce the refractive power of the right eye to be inspected ER obtained in S3. If necessary, the main control unit 101 may control the lens moving mechanism 21RD and the optotype moving mechanism 23RD.

(S5)
The main control unit 101 controls the optotype presenting optical systems 20L and 20R to execute a 5 m optometry. Specifically, the main control unit 101 controls the LCD 23L to display a distance optotype at or near the position intersecting the optical axis of the optotype presenting optical system 20L, and controls the LCD 23R to display the optotype presenting optics. A distance optotype is displayed at or near the position intersecting the optical axis of the system 20R. As a result, the left eye subject EL is presented with the distance optotype displayed on the LCD 23L, and the right eye subject ER is presented with the distance optotype displayed on the LCD 23R. The subject responds to the optotype, receives a predetermined operation, and the main control unit 101 further controls the turret plate rotation mechanism 12LD, 12RD, and the like. For example, in the visual acuity measurement, the next visual acuity is selected and presented based on the response to the Randold ring or the like, and the visual acuity value is determined by repeating this.

(S6)
Subsequently, the main control unit 101 controls the optotype presenting optical systems 20L and 20R to execute 0.25 m optometry. Specifically, the main control unit 101 controls the LCD 23L to display a near-view target at or near the position intersecting the optical axis of the rod glass 22L, and controls the LCD 23R to the optical axis of the rod glass 22R. A near-vision target is displayed at or near the intersection. By directing the line-of-sight direction of the left eye-tested EL toward the rod glass 22L, the near-view target displayed on the LCD 23L is presented to the left eye-tested EL, and the line-of-sight direction of the right eye-tested ER is directed toward the rod glass 22R. By pointing, the right eye subject ER is presented with the near-vision target displayed on the LCD 23R. As in S5, the subject responds to the optotype so that the examiner can confirm the need for bifocals. This completes the operation of the optometry device 1 (end).

[Modification example]
In the embodiment, a case where two types of examination distances (5 m and 0.25 m) are switched in the subjective examination has been described, but the configuration of the ophthalmic apparatus according to the embodiment is not limited to this. In the modified example according to the embodiment, a case where four types of inspection distances are switched in the subjective inspection will be described. Hereinafter, the optometry apparatus according to the modified example of the embodiment will be described focusing on the differences from the embodiment.

FIG. 7 shows a configuration example of the optical system of the optometry apparatus according to the modified example of the embodiment. In FIG. 7, the same parts as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted as appropriate. Note that FIG. 7 schematically shows the configuration of a cross section of the optotype presenting optical system in the XZ direction passing through the optical axis of the optotype presenting optical system. In FIG. 7, illustrations of the straightening optical systems 12L, 13L, 12R, 13R, the beam splitters BS1L, BS1R, the refractive power measuring optical systems 30L, 30R and the like are omitted. Further, in FIG. 7, the outline of the optotype displayed on the LCDs 23L and 23R is shown.

The difference between the optotype presenting optical systems 20L1 and 20R1 according to the modified example and the optotype presenting optical systems 20L and 20R according to the embodiment is that rod glass 50L and 51L are added to the optotype presenting optical system 20L1. This is the point that rod glasses 50R and 51R are added to the system 20R1. The rod glasses 50L and 50R are parallel plane members for performing 0.5 m optometry. The rod glasses 51L and 51R are parallel plane members for performing 1 m optometry. The rod glasses 51L, 50L, and 22L are arranged in this order from the side closer to the optical axis of the optotype display optical system 20L1. The rod glasses 51R, 50R, and 22R are arranged in this order from the side closer to the optical axis of the optotype display optical system 20R1.

From the formulas (2) to (4), the length d of the rod glasses 50L and 50R is 21.970 mm. Similarly, the length d of the rod glasses 51L and 51R is 10.235 mm.

The LCD 23L displays a distance optotype at a position corresponding to the optical axis of the optotype display optical system 20L1, a 1m optometry optotype at a position corresponding to the rod glass 51L, and a position corresponding to the rod glass 50L. An optotype for 5 m optometry and an optotype for 0.25 m optometry are displayed at a position corresponding to the rod glass 22L. Similarly, the LCD 23R displays a distance optotype at a position corresponding to the optical axis of the optotype display optical system 20R1, a position corresponding to the rod glass 51R, a 1m optometry optotype, and a position corresponding to the rod glass 50R. An optotype for 0.5 m optometry is displayed, and an optotype for 0.25 m optometry is displayed at a position corresponding to the rod glass 22R.

In the optotype display optical system 20L1 as described above, the distance optotype displayed on the LCD 23L passes through the imaging lens 21L, passes through the beam splitter BS1L, and passes through the correction optical systems 13L, 12L, and the optometry window 11L. Then, it is presented to the left eye subject EL. The optotype for 1 m optometry displayed on the LCD 23L passes through the rod glass 51L, the imaging lens 21L, the beam splitter BS1L, the correction optics 13L, 12L, and the optometry window 11L. It is presented to the left eye subject EL. The 0.5m optometry target displayed on the LCD 23L passes through the rod glass 50L, the imaging lens 21L, the beam splitter BS1L, the correction optics 13L, 12L, and the optometry window 11L. It is presented to the left eye subject EL. The 0.25 m optometry optotype displayed on the LCD 23L passes through the rod glass 22L, the imaging lens 21L, the beam splitter BS1L, the correction optics 13L, 12L, and the optometry window 11L. It is presented to the left eye subject EL. The same applies to the optotype display optical system 20R1. As a result, by simply switching the direction of the line of sight of the eye to be inspected, a distance examination using a distance optotype, a near examination using an optotype for 1 m eye examination, and an optotype for 0.5 m eye examination can be used. It is possible to switch between the near-field examination and the near-field examination using an optotype for 0.25 m optometry.

(Action / effect)
The operation and effect of the optometry device according to the embodiment will be described.

The optometry apparatus (1) according to the embodiment includes a correction optical system (12L, 12R) and an optotype display optical system (20L, 20R). The corrective optical system includes one or more optical elements (optometry lenses), and the refractive power applied to the eye to be inspected (left eye to be inspected EL, right inspected ER) can be changed. The optotype presenting optical system presents an optotype to the eye to be inspected. The optotype display optical system includes a display unit (LCD23L, LCD23R), a convex lens (imaging lens 21L, 21R), and an optical member (rod glass 22L, 22R). The display unit displays the optotype. The convex lens is arranged between the display unit and the corrective optical system. The optical member is provided at a position between the display unit and the convex lens and at a position deviated from the optical axis of the optotype presenting optical system, and changes the focal position of the convex lens. The display unit displays one of the distance vision and the near vision at a position corresponding to the optical axis, and displays the other of the distance and near vision at a position corresponding to the optical member.

According to such a configuration, the optical member is arranged at a position between the display unit and the convex lens and at a position deviated from the optical axis of the optometric display optical system, and the display unit is positioned at a position corresponding to the optical axis. Since one of the distance vision and the near vision is displayed and the other of the distance and near vision is displayed at the position corresponding to the optical member, a mechanism such as a rotation mechanism is provided. It is possible to switch between the distance examination and the near examination simply by switching the direction of the line of sight of the eye to be inspected. As a result, it becomes possible to switch between the distance inspection and the near inspection in a short time while reducing the size of the device.

Further, in the optometry apparatus according to the embodiment, the optical member includes a parallel plane member in which the end surface on the display unit side and the end surface on the convex lens side are substantially parallel, and the display unit is a distance viewing target at a position corresponding to the optical axis. May be displayed and the near vision target may be displayed at a position corresponding to the optical member.

According to such a configuration, since the parallel plane member is arranged between the display unit and the convex lens, it is possible to switch between the distance inspection and the near inspection in a short time with a very simple configuration. Can provide an optometry device.

Further, in the optometry apparatus according to the embodiment, the optical member may be arranged in the nasal direction with respect to the optical axis.

According to such a configuration, the near vision test can be performed in a state where the eye to be inspected is congested, so that the near vision test can be performed under conditions close to the state in which the subject actually wears spectacles.

Further, in the optometry apparatus according to the embodiment, the optical member may be arranged below the optical axis.

According to such a configuration, since the optical member is arranged below the optical axis of the optotype presenting optical system, near vision inspection is possible with the visual axis of the eye to be inspected facing downward. The near vision test can be performed under conditions close to the state in which the subject actually wears spectacles.

Further, the optometry apparatus according to the embodiment may include a rotation mechanism that rotates the optotype presenting optical system relative to the correction optical system around the eyeball rotation point.

According to such a configuration, it is possible to perform a subjective test according to the visual axis of the eye to be inspected, or to perform a subjective test while guiding the direction of the visual axis of the eye to be inspected to a desired direction.

Further, the eye examination apparatus according to the embodiment includes a left eye examination unit (LU) including a correction optical system and an optotype presenting optical system, and a right eye examination unit (RU) including a correction optical system and an optotype presentation optical system. A support member that supports the left eye examination unit and the right eye examination unit may be included.

With such a configuration, it is possible to perform distance examination and near examination for both eyes at the same time while reducing the size of the device, and it is possible to switch between distance examination and near examination in a short time. Can be provided.

(Other)
The optometry device according to the embodiment or a modification thereof may be provided with a forehead pad to which the forehead of the subject comes into contact with the nose pad 3.

Similar to the moving mechanism ULD, the various moving mechanisms according to the embodiment or its modifications may be provided with an actuator and a transmission mechanism. Similarly, the various rotating mechanisms according to the embodiment or its modifications may be provided with an actuator and a transmission mechanism, similarly to the turret plate rotating mechanism 12LD.

The embodiment shown above or a modification thereof is only an example for carrying out the present invention. A person who intends to carry out the present invention can make arbitrary modifications, omissions, additions, etc. within the scope of the gist of the present invention.

1 Optometry device 12L, 13L, 12R, 13R Orthodontic optical system 20L, 20R Optical system for presenting optotypes 21L, 21R Imaging lens 22L, 22R Rod glass 23L, 23R LCD
EL Left eye examination ER Right eye examination LU Left eye examination unit RU Right eye examination unit

Claims (6)

An orthodontic optical system that includes one or more optical elements and can change the refractive power applied to the eye to be inspected.
An optotype presenting optical system that presents an optotype to the eye to be inspected,
Including
The optotype display optical system is
A display unit that displays the optotype and
A convex lens arranged between the display unit and the correction optical system,
An optical member provided at a position between the display unit and the convex lens and at a position deviated from the optical axis of the optotype presenting optical system to change the focal position of the convex lens.
Including
The display unit displays one of the optometry and the optometry at a position corresponding to the optical axis, and the optometry and the optometry are at positions corresponding to the optical member. An optometry device characterized by displaying the other. The optical member includes a parallel plane member in which an end surface on the display portion side and an end surface on the convex lens side are substantially parallel to each other.
The optometry according to claim 1, wherein the display unit displays a distance optotype at a position corresponding to the optical axis and displays a near vision at a position corresponding to the optical member. apparatus. The optometry device according to claim 1 or 2, wherein the optical member is arranged in the nasal direction with respect to the optical axis. The optometry apparatus according to any one of claims 1 to 3, wherein the optical member is arranged below the optical axis. The invention according to any one of claims 1 to 4, wherein a rotation mechanism that rotates the optometric display optical system relative to the correction optical system around an eyeball rotation point is included. Optometry device. A left eye examination unit including the correction optical system and the optotype presentation optical system,
A right eye examination unit including the correction optical system and the optotype presentation optical system,
A support member that supports the left eye examination unit and the right eye examination unit,
The optometry apparatus according to any one of claims 1 to 5.

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