WO2010125908A1 - Eye examination device - Google Patents

Abstract

Disclosed is an eye examination device capable of correcting the visually recognized state of an eye to be examined to an examinable state. The eye examination device is provided with an input operation device (Pc) for separately correcting the positions of a left optotype displayed on a liquid crystal display unit (53) of a left-eye examination unit (5L) and a right optotype displayed on a liquid crystal display unit (53) of a right-eye examination unit (5R) in order that the visually recognized states of the left optotype visually recognized by the left eye to be examined and the right optotype visually recognized by the right eye to be examined will satisfy the optimum examination condition under which both eyes to be examined can be examined.

Description

Optometry equipment

The present invention relates to an optometry apparatus in which a target display device for displaying a target on the left and right eyes of a subject is incorporated in an inspection optical system in the left inspection unit and the right inspection unit.

2. Description of the Related Art A conventional optometry apparatus includes an optical apparatus main body provided with a refractive correction optical system and the like, and a target display apparatus that presents (displays) a target to the eye to be examined via the optical apparatus main body. (Subjective optometry system) is known (see, for example, Patent Document 1).

In this subjective optometry apparatus, a vertically extending support column is attached to an optometry table so that it can be moved up and down and swiveled around a vertical axis, and an arm extending in the horizontal direction is held by the support column, and the optical device main body is supported by this arm. I have to. The optical device main body includes a left inspection unit having a visual recognition window (optometry window) and a right inspection unit having a visual recognition window. In each inspection unit, refractive correction optical components such as a correction lens are incorporated.

In such a subjective optometry apparatus, an optotype display device is arranged in front of the examination unit, and the optotype is displayed on the left and right eyes (left and right examination eyes) of the subject through the viewing windows of the left and right examination units. While recognizing the target of the apparatus, the examiner asks the subject how to see the target and makes the examiner respond to the appearance, so that the refraction examination of the eye to be examined is performed. .

In such a subjective optometry apparatus, there is an example in which the correction lens is arranged at a position separated by a predetermined distance d (mm) from the corneal apex of the eye to be examined as a design of the refractive correction optical system including the correction lens. For example, a correction lens is usually arranged at a position where d = 12 for Asians and d = 13.75 for Westerners.

JP 2007-61380 A

However, in such a conventional subjective optometry apparatus, if the difference between the correction values of the left and right eyes by the refractive correction optical system is large, a difference in the size (viewing state) of an object that can be seen by the left and right eyes causes a correct binocular vision. There were inconveniences such as not being able to do it and not being able to measure the correct eyesight.

On the other hand, in the above-described subjective optometry apparatus, the correction lens is arranged at a position conjugate with the pupil, so that the same effect as in the case where the lens is arranged on the pupil, like a contact lens, can be obtained. Is possible.

When such a design is performed, the visual recognition size (visual recognition state) of the visual target does not change depending on the refractive power, so the above-described problem does not occur. However, there is a problem that the difference in the visual size of the image that can be seen with the left and right eyes may be recognized for the first time when the glasses are actually created at the measured frequency.

In addition, the above-described subjective optometry apparatus has a problem that the binocular vision function cannot be correctly confirmed in the case of a subject whose contrast sensitivity (viewing state) between the left and right eyes is different for some reason, such as cataract.

Furthermore, vergence / divergence test (inspection of eyeball rotation) and misalignment test (displaying different images on the left and right eyes and superimposing each image at the center position) ) Is usually performed using a prism lens, but with conventional subjective optometry devices, the chromatic aberration increases as the prism power increases, and the contour of the target cannot be recognized correctly. was there.

Therefore, an object of the present invention is to provide an optometry apparatus capable of individually correcting a visual target so that a visual check state by an eye to be examined can be correctly inspected.

In order to achieve this object, the present invention includes a left inspection unit that incorporates a left inspection optical system that inspects the subject's left eye and a right inspection optical system that inspects the subject's right eye. A built-in right examination unit, a left image display device for displaying a left visual target on the left eye to be examined via the left examination optical system, and a right visual target to the right eye to be examined via the right examination optical system The left image so that the visual inspection state of the right image displayed by the left eye and the right eye visually recognized by the right eye is the optimum inspection condition. The optometrist device is provided with an optotype display state correction unit that individually corrects the left optotype displayed on the display device and the right optotype displayed on the right image display device. And

According to this configuration, correction for correctly inspecting the visual recognition state by the eye to be examined can be easily performed.

It is explanatory drawing which shows the outline | summary of the optometry apparatus concerning one Example of this invention. It is an external view of the optometry apparatus shown in FIG. It is a schematic explanatory drawing explaining the turning center of the test | inspection unit of FIG. It is a figure which shows the optical system of the optometry apparatus shown in FIG. It is a figure which expands and shows the thing for left eyes of the optical system shown in FIG. It is a top view of the optical system for left eyes shown in FIG. It is a figure which expands and shows the thing for right eyes of the optical system shown in FIG. It is a top view of the optical system for right eyes shown in FIG. It is explanatory drawing which shows the other example of the test | inspection optical system of the optometry apparatus which concerns on one Example of this invention. It is a block diagram of the control system of the optometry apparatus concerning one Example of this invention. FIG. 9 is a block diagram of a control system showing a modification in which the target selection unit and the target display state correction unit shown in FIG. 8 are provided in an arithmetic control circuit. It is explanatory drawing which shows the connection state of the lens meter and monitor apparatus which were arrange | positioned in the vicinity of the optometry apparatus, and an optometry apparatus. It is explanatory drawing which shows the state which placed the lens meter of FIG. 9A in the distance from the optometry apparatus, and connected the lens meter and the monitor apparatus. FIG. 9B is an explanatory diagram showing a state in which a plurality of optometry apparatuses and monitor apparatuses in FIG. 9A are installed and a lens meter is connected to the monitor apparatus via a LAN. FIG. 9B is an external view of the lens meter shown in FIGS. 9A to 9C. It is explanatory drawing of the left target for a size confirmation each displayed on the liquid crystal display of a left test | inspection unit. It is explanatory drawing of the right visual target for size confirmation each displayed on the liquid crystal display of a right test | inspection unit. It is explanatory drawing which shows an example of a visual target visual recognition state when making a subject visually recognize the left visual target of FIG. 11A and FIG. 11B, the right visual target, and the right visual target of FIG. It is explanatory drawing which shows the other example of a visual target visual recognition state when making a subject visually recognize simultaneously the left visual target of FIG. 11A and FIG. 11B, and the right visual target of FIG. It is explanatory drawing which shows the further another example of a visual target visual recognition state when making a subject visually recognize the left visual target of FIG. 11A and FIG. 11B, and the right visual target of FIG. It is explanatory drawing of the left target for contrast confirmation displayed on the liquid crystal display of a left test | inspection unit, respectively. It is explanatory drawing of the right visual target for contrast confirmation displayed on the liquid crystal display of a right test | inspection unit, respectively. It is explanatory drawing which shows a normal visual target visual recognition state when making a subject visually recognize the left visual target of FIG. 15A and FIG. 15B, and the right visual target of FIG. 16 simultaneously. It is explanatory drawing which shows an example of the visual target visual recognition state from which the contrast differs when making a subject visually recognize the left visual target of FIG. 15A and FIG. 15B, and the right visual target of FIG. It is explanatory drawing which shows the left target and the right target which are presented to the left eye and the right eye of the cross chart in the oblique test. It is explanatory drawing which shows the synthesized image which makes a subject visually recognize the left target and the right target of FIG. 18A simultaneously. It is explanatory drawing which shows an example of a visual target visual recognition state when making a subject visually recognize the left visual target and the right visual target shown to FIG. 18A simultaneously. It is explanatory drawing which shows the character A as a left target shown to a left eye. It is explanatory drawing which shows the character A as a right target shown to a right eye. It is explanatory drawing which shows the example of a visual target visual recognition state when making a subject visually recognize the left visual target of FIG. 20A and the right visual target of FIG. 20B simultaneously. It is chart explanatory drawing which shows the relationship between the optotype shown to the left eye of the cross chart in an oblique test, and a fusion frame. It is chart explanatory drawing which shows the relationship between the optotype shown to the right eye of the cross chart in an oblique test, and a fusion frame. It is explanatory drawing when it is visible to a subject in the state which the target shown in FIG. 21A and FIG. 21B fused. It is explanatory drawing which shows the left target shown in FIG. It is explanatory drawing which shows the right optotype shown in FIG. It is explanatory drawing which shows a visual target visual recognition state when making a subject visually recognize the left visual target and the right visual target shown to FIG. 23A and FIG. 23B, and another example. It is explanatory drawing which shows the Landol ring as a left target and a right target presented to the left eye and the right eye. It is explanatory drawing which shows the example of a visual target visual recognition state when making a subject visually recognize the left visual target and the right visual target of FIG. 24A simultaneously.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Constitution]
In FIG. 1, 1 is an optometry table whose height can be adjusted up and down, 2 is an optometry apparatus disposed on the optometry table 1, 3 is an optometry chair used together with the optometry table 1, and 4 is an examination seated on the optometry chair 3. It is a person.

As shown in FIG. 2, the optometry apparatus 2 includes a pedestal portion 5a, an inspection unit driving device 5b disposed on the pedestal portion 5a, and a left eye disposed on the left and right sides of the inspection unit driving device 5b. Inspection unit (left inspection unit) 5L and right-eye inspection unit (right inspection unit) 5R. In the apparatus main body of the left eye inspection unit 5L and the right eye inspection unit 5R, a left eye measurement optical system (left eye inspection optical system) and a right eye measurement optical system (right eye inspection optical system), which will be described later, are provided. System) is built in each.

In the following description, for convenience of explanation, the left-eye inspection unit 5L and the right-eye inspection unit 5R are simply abbreviated as the inspection unit 5L and the inspection unit 5R as necessary. In addition, the measurement optical system for the left eye (the inspection optical system for the left eye) and the measurement optical system for the right eye (the inspection optical system for the right eye) are abbreviated as the inspection optical system and used for the description.

Furthermore, in the following description, the components used in the left-eye inspection unit 5L and the right-eye inspection unit 5R will be described using terms that do not distinguish between the left-eye and right-eye as necessary.

The optometry apparatus 2 shown in FIG. 2 extends in the vertical direction, supports 5p and 5q supporting the inspection units 5L and 5R on the inspection unit driving device 5b, and the inspection position of the face of the subject 4 with respect to the inspection units 5L and 5R. And a face receiving device 6 to be supported.

The face receiving device 6 is provided with a pair of struts 6a and 6b and a chin rest 6d. An arc-shaped forehead pad 6c is provided on the pair of columns 6a and 6b. The chin rest 6d can be adjusted up and down by a knob 6e. The forehead pad 6c can also be adjusted in the front-rear direction.

Further, in the apparatus main body 5b1 of the inspection unit driving apparatus 5b, a left support base BL and a right support base BR as shown in FIG. The left support base BL and the right support base BR are provided so as to be independently movable in a three-dimensional direction (front and rear, left and right, up and down) by an XYZ drive mechanism (not shown). The left support base BL and the right support base BR are respectively attached (supported and held) to the vertical support columns 5p and 5q that extend in the vertical direction around the vertical axes (axis lines) UoL and UoR in FIG. 2A. )ing. These vertical axes (axis lines) UoL and UoR are supported on the left and right subjects of the subject in a state in which the subject places his / her face on the chin rest 6d and supports the forehead on the forehead 6c. It is arranged so as to be the eyeball rotation axis (eyeball rotation center axis, eyeball center position) of the optometry.

Further, in the apparatus main body 5b1 of the inspection unit driving apparatus 5b, a swing driving mechanism (rotating drive) for rotating the pillars 5p and 5q in a horizontal direction independently from each other with respect to the left and right support bases (not shown). (Not shown) is built-in.

For the XYZ drive mechanism, for example, a three-dimensional drive device (three-dimensional drive unit) including a drive motor such as a pulse drive motor, and a feed screw that is rotationally driven by the three-dimensional drive device are used. A known configuration can be adopted for the XYZ drive mechanism.

The turning drive mechanism includes a combination of a turning drive unit including a turning drive motor (turning drive device) such as a pulse motor (turning drive motor) and a gear operated by the turning drive unit. Is used. A known configuration can also be adopted for this turning drive mechanism.

With such a configuration, the inspection units 5L and 5R can be independently driven in a three-dimensional direction, and can be turned in the horizontal direction around the eyeball rotation axis of the left and right eye to be examined.

Also, the inspection units 5L and 5R have the functions of objective eye refractive power measurement and subjective eye refractive power measurement simultaneously for both eyes.

And as shown to FIG. 2A, the subject response input apparatus 6LR is provided in the base part 5a. The subject response input device 6LR includes a joystick lever 6h and a button 6g provided on the joystick lever 6h.

Further, the above-described inspection optical system of the inspection unit 5L includes an anterior ocular segment imaging optical system 30L shown in FIGS. 3 to 5 and an XY alignment optical system used for forming a bright spot image for alignment shown in FIGS. 31L, the fixation optical system 32L and the refractive power measurement optical system 33L shown in FIG.

The inspection optical system of the inspection unit 5R includes an anterior ocular segment imaging optical system 30R shown in FIGS. 3 and 6, an XY alignment optical system 31R used for forming a bright spot image for alignment, and a fixation optical system 32R shown in FIG. And a refractive power measurement optical system 33R.

The inspection optical system of the inspection unit 5L and the inspection optical system of the inspection unit 5R are symmetric and have the same configuration. First, the inspection optical system of this inspection unit 5L will be described.
(Inspection optical system of inspection unit 5L)
The anterior ocular segment imaging optical system 30L of the inspection unit 5L includes the anterior ocular segment illumination optical system 34 and the imaging optical system 35 shown in FIG. The anterior segment illumination optical system 34 includes an illumination light source 36 for anterior segment illumination, a diaphragm 36a, and a projection lens 37 that projects light from the illumination light source 36 onto the anterior segment of the eye E to be examined.

The imaging optical system 35 includes a prism P on which reflected light from the anterior segment of the eye E is incident, an objective lens 38, a dichroic mirror 39, an aperture 40, a dichroic mirror 41, relay lenses 42 and 43, a dichroic mirror 44, and a CCD lens. (Imaging lens) 45 and CCD (imaging part) 46 are provided.

The XY alignment optical system 31L includes an alignment illumination optical system 47 and a photographing optical system 35 as an alignment light receiving optical system. As shown in FIG. 4, the alignment illumination optical system 47 includes an alignment illumination light source 48, an aperture 49 as an alignment target, a relay lens 50, a dichroic mirror 41, an aperture 40, a dichroic mirror 39, an objective lens 38, and a prism. P.

As shown in FIG. 5, the fixation optical system 32 </ b> L is a target such as a fixation target for fixing the eye to be inspected or a chart for subjective optometry (including a cross oblique chart for oblique examination). Color liquid crystal display (left-eye liquid crystal display as a left image display device) 53, a half mirror 54, a collimator lens 55, rotary prisms 55A and 55B, a reflection mirror 56, a moving lens 57, Relay lenses 58 and 59, cross cylinder lenses (VCC lenses) 59A and 59B, reflection mirror 60, dichroic mirrors 61 and 39, objective lens 38, and prism (which may be a mirror) P are included.

As the rotary prisms 55A and 55B and the cross cylinder lenses (VCC lenses) 59A and 59B, known ones as disclosed in Patent Document 1 are used.

In the fixation optical system 32L, the moving lens 57 can be moved in the optical axis direction by the pulse motor PMa according to the refractive power of the eye to be examined. Thereby, it is possible to cause the eye to be inspected to fixate.

The fixation optical system 32L is provided with a fusion target presenting optical system 32L 'shown in FIG. The fusion target presenting optical system 32L ′ includes an LED 53A as an illumination light source, a collimator lens 53B, a fusion frame chart 53D, and a total reflection mirror 53E.

Although the target display position adjustment operation of the present invention can be executed using the inspection optical system of FIG. 5, the fusion target presentation optical system 32L ′ and the liquid crystal display 53 of FIG. 5 are omitted. Alternatively, as shown in FIG. 7A, the 3LCD 300 can be provided as an image display device. The 3LCD 300 is a combination of three LCDs (liquid crystal displays) so that images such as targets can be displayed in color on the three LCDs (liquid crystal displays). The rotary prisms 55A and 55B described above can be omitted as shown in FIG. 7A. In FIG. 7A, a part of the optical components of FIGS. 5 and 7 is schematically shown. In the case of such a configuration of FIG. 7A, since a large number of optical components can be omitted, the whole can be reduced in size. However, in the case of using the inspection optical system of FIGS. The position adjustment operation will be described.

The refractive power measurement optical system 33L includes the measurement light beam projection optical system 62 and the measurement light beam reception optical system 63 shown in FIG. The measurement light beam projection optical system 62 includes a measurement light source 64 such as an infrared LED, a collimator lens 65, a conical prism 66, a ring target 67, a relay lens 68, a ring-shaped stop 69, and a hole in which a through hole 70a is formed in the center. A perforated prism 70, dichroic mirrors 61 and 39, an objective lens 38, and a prism P are included.

The measurement light beam receiving optical system 63 includes a prism P that receives reflected light from the fundus oculi Ef of the eye E, an objective lens 38, dichroic mirrors 39 and 61, a through hole 70a of a perforated prism 70, a reflection mirror 71, and a relay. A lens 72, a moving lens 73, a reflection mirror 74, a dichroic mirror 44, a CCD lens 45, and a CCD 46 are included.
(Inspection optical system of inspection unit 5R)
Further, since the inspection optical system of the right-eye inspection unit 5R is the same as the inspection optical system of the inspection unit 5L as described above, the reference numerals used for the inspection unit 5L are attached and detailed description thereof is omitted. To do. The liquid crystal display 53 used in the inspection optical system of the right-eye inspection unit 5R is a right-eye liquid crystal display (right image display device), and a fixation target or a chart for subjective optometry (oblique position). A visual target (right visual target) such as a cross oblique chart for inspection) is displayed.
(XYZ drive mechanism)
As described above, the inspection units 5L and 5R are independently driven in the three-dimensional direction by the left and right XYZ drive mechanisms. The left and right XYZ drive mechanisms include the left three-dimensional drive device and the right three-dimensional drive device shown in FIG.

The left three-dimensional drive device includes a left unit drive device Ld and a sub (auxiliary) arithmetic control circuit 62 '(L) for controlling the operation of the left unit drive device Ld. The right three-dimensional drive device also includes a right unit drive device Rd and a sub (auxiliary) arithmetic control circuit 62 '(R) that controls the operation of the right unit drive device Rd.

Further, the left unit drive device Ld includes a drive device (X drive device) 20 that drives a support base (not shown) in the left-right direction (X direction), and a support base (not shown) in the vertical direction (Y direction). A driving device (Y driving device) 24 for driving and a driving device (Z driving device) 26 for driving a support base (not shown) in the front-rear direction (Z direction) are provided. Each of these drive devices 20, 24, and 26 includes a drive motor such as a pulse drive motor and a feed screw that is rotationally driven by the drive motor.
(Swivel drive mechanism)
Further, as described above, the inspection units 5L and 5R are swiveled around the vertical axes of the columns 5p and 5q in FIG. 2 by the left and right swivel drive mechanisms (horizontal swivel drive devices) 28 and 28 in FIG. It has become.

Each of the turning drive mechanisms (horizontal turning drive devices) 28, 28 has a combination of a turning drive means such as a pulse motor (turning drive motor) and a gear operated by the turning drive means as described above. It is used.
<Control circuit>
Further, the optometry apparatus 2 of FIG. 2 including the inspection units 5L and 5R includes a control circuit which is the control system shown in FIG. This control circuit controls the operation of the left and right sub (auxiliary) arithmetic control circuits 62 '(L) and 62' (R) and the sub arithmetic control circuits 62 '(L) and 62' (R). A main arithmetic control circuit 63 'is provided.
(Calculation control circuit 62 '(L), 62' (R))
These sub (auxiliary) arithmetic control circuits 62 ′ (L) and 62 ′ (R) are controlled by the main arithmetic control circuit 63 ′ so that the pulse motors (not shown) of the driving devices 20, 24, 26 and 28 are not shown. The drive motor is controlled to be driven.

Further, the sub (auxiliary) arithmetic control circuits 62 ′ (L) and 62 ′ (R) shown in FIG. 8 include an anterior illumination light source 36, a liquid crystal display 53, a measurement light source 64, and a pulse motor. PMa and the like are controlled to operate. Further, detection signals from the CCD 46 are input to the sub (auxiliary) arithmetic control circuits 62 ′ (L) and 62 ′ (R).

Further, as described above, the inspection units 5L and 5R respectively have left and right inspection optical systems, and when the inspection units 5L and 5R are set at the initial positions, the optical axes of the left and right inspection optical systems are set. Of these, the optical axes on the front side (face receiving device 6 side) of the prisms P and P are set to be parallel to each other.

This initial position is determined when the left and right eyes of the subject visually recognize the liquid crystal displays 53 and 53 in the left and right inspection units 5L and 5R via the inspection optical systems of the inspection units 5L and 5R. It is set so that the visual axes of the optometry are parallel to each other and can be viewed at infinity.

Further, the rotation angle detection sensors PsL and PsR provided on the left and right inspection units 5L and 5R detect the rotation angles of the columns 5p and 5q, thereby confirming that the inspection units 5L and 5R are set at the initial positions. Can be detected. Initial position detection signals from these rotation angle detection sensors PsL and PsR are inputted to sub (auxiliary) arithmetic control circuits 62 '(L) and 62' (R), respectively. A rotary encoder, a potentiometer, or the like can be used as these rotation angle detection sensors PsL and PsR.

As described above, the sub (auxiliary) arithmetic control circuits 62 '(L) and 62' (R) control the operation of the same components and the like. Accordingly, in the description of the operation of the inspection units 5L and 5R described below, the description of (L), (R), etc. in the sub (auxiliary) arithmetic control circuit 62 '(L) and arithmetic control circuit 62' (R) Used as needed for explanation.
(Calculation control circuit 63 ')
(A). Connection Relationship As shown in FIG. 8, the arithmetic control circuit 63 ′ controls the arithmetic control circuits 62 ′ and 62 ′ of the inspection units 5L and 5R.

In addition, as shown in FIG. 2, the pedestal portion 5a is provided with a subject response input device 6LR as a subject response portion. This subject response input device 6LR has a joystick lever 6h and a button (switch) 6g provided at the upper end of the joystick lever 6h. The joystick lever 6h is provided so as to be tiltable and rotatable about an axis. The button (switch) 6g is used for selection of menus and targets, photographing, and the like. In addition, as shown in FIG. 8, the subject response input device 6LR includes a tilt detection sensor 12b that detects a tilt operation of the joystick lever 6h, and a rotation that detects a rotation operation of the joystick lever 6h about the axis. It has a sensor 12c. This patient response input device 6LR is connected to the arithmetic control circuit 63 'of FIG. 8, and is an ON / OFF operation signal of the button 6g, a tilt signal from the tilt detection sensor 12b, a rotation signal from the rotation sensor 12c, and the like. Is input to the arithmetic control circuit 63 '.

Furthermore, a target control device (target control unit) CLR is connected to the arithmetic control circuit 63 ′ shown in FIG. The target operation device CLR includes a target selection unit 81 and a target display state correction unit 82. The target display state correction unit 82 further includes a target size correction unit 83. And a target contrast correction unit 84 and an eye position correction unit 85 are provided.
In addition, an input operation device Pc composed of a personal computer or the like as shown in FIG. 2A is used for the target operation device CLR. The input operation device Pc includes a display unit Dsp and an examiner operation unit K. The examiner operation unit K includes a keyboard Kb including a cursor button and a plurality of selection buttons, and a dial Da. Note that the target selection unit 81 and the target display state correction unit 82 (target size correction unit 83, target contrast correction unit 84, eye misalignment correction unit 85) of FIG. 8 are provided in the target operation device CLR. However, as shown in FIG. 8A, these may be provided in the arithmetic control circuit 63 ′.

Further, a monitor device 64q is connected to the arithmetic control circuit 63 ′. As shown in FIG. 2, the monitor device 64q is attached to a column 64s provided upright on the pedestal portion 5a. The monitor device 64q displays information necessary for the examination such as examination data, a chart, and an anterior eye image of the eye to be examined on the monitor screen 64q ′.

Further, a memory M as a target recording unit is connected to the arithmetic control circuit 63 ′. This memory M records (stores) a landscape chart used as a visual target, a large number of visual targets used for refractive power measurement, a large number of visual targets and charts used for binocular vision function, oblique inspection, and the like. Has been.

For example, as a target used for the oblique inspection, for example, a cross oblique test chart as shown in FIG. 19 can be used. In this cross oblique test chart, a left eye misalignment detection target (left eye oblique detection target) Lm and a right eye misalignment detection target (right eye oblique detection target) Rm are used. Here, the left-eye shift detection target Lm is composed of a pair of horizontal target lines Lm1 and Lm2 spaced laterally, and the right-eye shift detection target Rm is a pair of vertical views spaced vertically. It consists of marked lines Rm1, Rm2. The left-eye deviation detection target Lm is displayed on the liquid crystal display 53 of the inspection unit 5L, and the right-eye deviation detection target Rm is displayed on the liquid crystal display 53 of the inspection unit 5R. Yes.

It should be noted that the left-eye deviation detection target Lm can be displayed on the liquid crystal display 53 of the inspection unit 5R, and the right-eye deviation detection target Rm can be displayed on the liquid crystal display 53 of the inspection unit 5L. In addition, the target used for the oblique position inspection or the like is not limited to the cross oblique position test chart, but other displays as used in the past can be used. In the following description, the left side shown in FIG. An eye misalignment detection target Lm and a right eye misalignment detection target Rm are used.

As shown in FIG. 8, these targets, charts, and the like can be selected by a target operation device CLR that serves both as a target selection unit 81 and a target display state correction unit 82, and the display position. Etc. can be adjusted.

In addition, as this optotype operating device CLR, a dial type (dial Da) may be used, a cursor key of the keyboard Kb may be used, a mouse, a touch pen, or the like may be used, or a touch panel. May be used. In addition, the test target, chart, and the like can be arbitrarily selected by the examiner, and are sequentially selected and displayed according to the optometry program. The optometry program or the like is recorded (stored) in a memory (not shown) of the arithmetic control circuit 63 ', for example. Further, the single optotype operating device CLR can operate the optotypes of the left and right liquid crystal displays 53 and 53 according to the optometry program. It is also possible to perform the above operations with separate target control devices.

In the following description, an example of a target operation by operating the joystick lever 6h and the button 6g of one target control device CLR and the subject response input device 6LR will be described.
(B). By the way, the parts of the inspection units 5L and 5R, the parts assembly part, and the parts such as the liquid crystal display units 53 and 53 incorporated as part of the parts in the inspection units 5L and 5R have dimensional tolerances. It is manufactured with high accuracy within the range. However, even if it is within the range of dimensional tolerances, dimensional variations occur in the component assembly portion, the liquid crystal display 53, and the like. In addition to such dimensional variations of components, adjustment variations that occur when such components are incorporated into the inspection units 5L, 5R, etc. are particularly problematic. That is, the size of the liquid crystal display 53 is reduced with the miniaturization of the optometry apparatus, the chart portion displayed on the liquid crystal display 53 is reduced, and the chart portion is enlarged through the lens of the optical system. The display center is adjusted so that the display center of the liquid crystal display 53 coincides with the optical axis of the optical system of the inspection unit 5L (5R) when the liquid crystal displays 53 and 53 are assembled to the inspection units 5L and 5R. (Assembly adjustment) is very difficult.

When the liquid crystal display 53 is assembled to such a component assembling part, the display center of the liquid crystal display 53 and the inspection in the inspection unit 5L (5R) are caused due to dimensional variations of the liquid crystal display 53 and the component assembling part. The optical axis of the optical system is shifted in a direction perpendicular to the optical axis.

Further, a turning drive motor (not shown) of the turning drive mechanisms (horizontal rotation drive devices) 28, 28 is predetermined by the arithmetic control circuit 63 'so that the inspection unit 5L (5R) turns by a predetermined angle in the horizontal direction. Even when the drive pulse is controlled and stopped, the inspection unit 5L (5R) stops from a predetermined angle due to individual differences in the gear (not shown) of the horizontal rotation drive device 28 and the turning drive motor. Shift.

Since such a deviation (displacement) occurs in each of the inspection units 5L and 5R, the displacement is corrected for each of the inspection units 5L and 5R as described later.

Note that the arithmetic control circuit 63 ′ displays an operation menu or the like on the monitor screen (display unit) 64q ′ of the monitor device 64q when the optometry apparatus 2 is turned on and started. The operation menu includes an initial setting menu and the like.

Moreover, the arithmetic control circuit 63 'displays the initial setting screen on the monitor screen 64q' when the initial setting menu is selected by tilting the joystick lever 6h from the operation menu for initial display setting. On this initial setting screen, a display position correction menu (item) in the far vision state, a display position correction menu (item) in the congestion state, and the like can be displayed.

On the monitor screen 64q ′, when the display position correction menu (item) is selected, the display center position of an image such as a target displayed on the liquid crystal display 53 of the left inspection unit 5L is corrected. Display the left display position correction menu (item), the right display position correction menu (item), etc., for correcting the display center position of the image such as the target displayed on the liquid crystal display 53 of the right inspection unit 5R. Can do.

When the left display position correction menu (item) is selected from the correction menu (item) by tilting the joystick lever 6h, the calculation control circuit 63 'operates the sub (auxiliary) calculation control circuit 62' (L). Then, the sub (auxiliary) arithmetic control circuit 62 '(L) displays the mark reference point indicating the initial display center position on the liquid crystal display 53 of the left inspection unit 5L.

On the other hand, when the right display position correction menu (item) is selected from the correction menu (item) by tilting the joystick lever 6h, the calculation control circuit 63 'controls the operation of the calculation control circuit 62' (R) to perform calculation. The control circuit 62 ′ (R) displays a mark indicating the initial display center position on the liquid crystal display 53 of the right inspection unit 5L.

In such a display state, the arithmetic control circuit 63 'moves and controls the mark indicating the display center position by tilting the joystick lever 6h, and moves the mark indicating the display center position by pressing the button 6g after the movement control. The position can be set. The initial display setting operation can also be performed by an input unit such as a mouse or a keyboard of a personal computer.
<Connection between the optometry apparatus 2 and other devices>
A lens meter 1000 is connected to the optometry apparatus 2 as another device. The lens meter 1000 may be connected in any of FIGS. 9A to 9C. The appearance of the lens meter 1000 is shown in FIG. 10, for example. The lens meter 1000 has a function of simultaneously measuring the optical characteristics of the left and right framed spectacle lenses 1006L and 1006R of the spectacles 1006.

In FIG. 10, reference numerals 1007L and 1007R denote pressing levers for the spectacle lenses 1006L and 1006R. When the eyeglasses 1006 are placed on the eyeglass set base 1001 of the lens meter 1000, a detection pin (not shown) installed on the eyeglass set base 1001 detects the set of eyeglasses 1006.

As a result, the holding levers 1007L and 1007R are automatically lowered, and the glasses 1006 are fixed by the holding claws 1008L and 1008R. It is obtained at the same time. Further, based on the optical characteristic data of the left and right eyeglass lenses 1006L and 1006R, a PD value that is the distance between the pupils of the subject (eyeglass wearer) is obtained.

The structure of the measurement optical system of the lens meter 1000 can in principle be configured using two known measurement optical systems, and the detailed configuration is described in, for example, Japanese Patent Application Laid-Open No. 2002-202219. In the embodiment of the present invention, the lens meter shown in FIG. 10 is used, but a known auto lens meter having a PD measurement function can also be used.

The optical characteristic data of the spectacle lens of the lens meter 1000 is input to the arithmetic control circuit 63 ′. The arithmetic control circuit 63 'also plays a role of displaying the optical characteristic value and PD value of the spectacle lens on the monitor screen 64q' of the monitor device 64q. In the case of a spectacle lens wearer, it is desirable to perform initial setting of the inspection units 5L and 5R using this PD value.
[Action]
Next, the control action by the arithmetic control circuit 63 'of the optometry apparatus having such a configuration will be described.
(1). Setting of inspection units 5L and 5R to the initial position of the inspection optical system In such a configuration, the optical axis of the inspection optical system of the left inspection unit 5L of the optometry apparatus 2 is closer to the front side than the prism P (the face receiving device 6 side). ) Is the left face receiving side optical axis portion, and the optical axis on the near side (face receiving device 6 side) from the prism P among the optical axes of the inspection optical system of the right inspection unit 5R is the right face receiving side optical axis. As a part, the setting state of the initial position of the inspection optical system of the inspection units 5L and 5R will be described.

When the optometry apparatus 2 is turned on and started up, the arithmetic control circuit 63 'controls the left and right unit drive devices Rd and Rd of the XYZ drive mechanism and controls the left and right horizontal rotation drive devices 28, 28. To control the inspection units 5L and 5R to the initial position (return to the initial position).

In this control, the arithmetic control circuit 63 ′ determines the driving amount in the three-dimensional direction of the inspection unit 5L by the left unit driving device Ld and the inspection unit 5R by the right unit driving device Rd, and the left unit driving device Ld and the right unit driving device. It can be detected from the number of Rd drive pulses. Incidentally, a movement amount detection sensor (X direction movement amount detection sensor, Y direction movement amount detection sensor, Z direction movement amount detection sensor) for detecting the movement amount of the inspection units 5L and 5R in the three-dimensional direction is provided. It is also possible to detect the driving amount (movement amount) of the inspection units 5L and 5R in the three-dimensional direction from the amount detection sensor. Then, the arithmetic control circuit 63 ′ obtains the positions of the inspection units 5L and 5R in the three-dimensional direction from the drive amount (movement amount) and the like. On the other hand, the arithmetic control circuit 63 ′ detects the rotation angles and the like of the columns 5p and 5q by the rotation angle detection sensors PsL and PsR, and turns angles (turning positions) of the inspection units 5L and 5R integrated with the columns 5p and 5q, respectively. Etc. are detected.

Then, the arithmetic control circuit 63 ′ controls the left face receiving side optical axis part and the right face receiving side optical axis part from the position of the inspection units 5 L, 5 R in the three-dimensional direction when returning the inspection units 5 L, 5 R to the initial positions. Is set to the standard interpupillary distance (for example, 64 mm) of the subject, and the left face receiving side optical axis and the right face receiving side optical axis based on the turning angles (turning positions) of the examination units 5L and 5R. Are set parallel to each other (far-distance view position where the far-distance state is reached).

This initial position setting can also be executed when a reset command is sent from the arithmetic control circuit 63 'to the sub (auxiliary) arithmetic control circuit 62' of the optometer 2.
(2). Input of interpupillary distance PD for refractive power measurement The interpupillary distance PD of the subject is input to the arithmetic control circuit 63 '. The inter-pupil distance PD is obtained by measuring the distance between the optical centers of the right and left eyeglass lenses of the glasses (the inter-pupil distance PD of the eyeglass wearer) with the lens meter 1000, or is measured with a PD meter or the like. The interpupillary distance PD obtained by the lens meter 1000 is input from the lens meter 1000 to the arithmetic control circuit 63 'through a connection line such as a data line. The interpupillary distance PD measured by a PD meter or the like can be input to the arithmetic control circuit 63 ′ from a personal computer (data input device) connected to the optometry apparatus 2, or a keyboard (data input) can be input to the optometry apparatus 2. The device can be input to the arithmetic control circuit 63 'from this keyboard. Further, the inter-pupil distance PD can be input to the PD input frame on the input screen by tilting the joystick lever 6h or the like by displaying the PD input screen on the monitor screen 64q ′ of the monitor device 64q.

Further, the left and right sub (auxiliary) arithmetic control circuits 62 '(L) and 62' (R) are controlled by the arithmetic control circuit 63 'so that the sub (auxiliary) arithmetic control circuits 62' (L) and 62 'are operated. ′ (R) causes the target to be displayed at the center of the liquid crystal displays 53, 53 of the left and right inspection units 5L, 5R, and the left unit driving device Ld, right to the position where the target of the liquid crystal displays 53, 53 can be seen. By causing the unit drive device Rd to move the inspection units 5L and 5R to the left and right, the distance between the inspection units 5L and 5R is input to the arithmetic control circuit 63 ′ as the inter-pupil distance PD of the subject from this movement control amount. be able to.
(3). Correction of target display size (correction of unequal image vision)
A. Unequal image vision When the left and right eyes of the subject (ie, the left and right eye) are examined by an optometer with a refractive correction optical system, there is a large difference in the refractive correction values of the left and right eyes (depending on the refractive correction optical system). If there is a difference in the refractive correction power between the left eye and the right eye), a difference in the size of the images recognized by the left and right eyes (unequal image vision) occurs. This difference in the size of the left and right eye images can be confirmed by unequal image inspection.

Before this inspection, first, the initial position of the inspection optical system of the inspection units 5L and 5R is set as described in (1) above, and the interpupillary distance is measured for refractive power measurement as in (2). Enter the PD. The subject inspects the visual target size with the left eye and the right eye while wearing a refraction correcting lens.

In this case, for example, the inverted U-shaped display size confirmation target (left target) 100L shown in FIG. 11A is displayed on the liquid crystal display 53 of the left inspection unit 5L, and the liquid crystal display of the right inspection unit 5R. 53, the U-shaped display size confirmation target (right target) 100R shown in FIG. 11B is displayed. The display size confirmation targets 100L and 100R are displayed in the same size except for the left and right directions. Further, the display size confirmation target 100L is displayed on the liquid crystal display 53 of the left inspection unit 5L so as to be positioned on the left side of the center line O1 in the horizontal direction, and the display size confirmation target 100R is displayed on the liquid crystal display of the right inspection unit 5R. The device 53 is displayed on the right side of the center line O1 in the left-right direction. Furthermore, the display positions in the vertical direction of the display size confirmation targets 100L and 100R are set to the same position.

In this state, the left eye of the subject is made to visually recognize the display size confirmation target 100 displayed on the left liquid crystal display 53 via the inspection optical system of the inspection unit 5L, and the right eye of the subject is examined. The display size confirmation target 100R displayed on the right liquid crystal display 53 is visually recognized through the inspection optical system of the inspection unit 5R.
(Visible state)
Accordingly, when the left eye and the right eye do not have an oblique position or the like, the subject displays the display size confirmation targets 100L and 100R visually recognized by the left eye and the right eye, respectively, as shown in FIGS. As described above, the images are recognized in the state of simultaneous viewing and fusion (the state where the same point viewed with both eyes is viewed as one point).

Here, when the visual acuity values (refractive power) of the left eye and the right eye are the same (when the refractive correction power is the same), the display size confirmation targets 100L and 100R are recognized with the same size as shown in FIG. The

Further, when the visual acuity values of the left eye and the right eye are different (when the refractive correction power is different), that is, when the power of the wearing correction lens is different, the display size confirmation targets 100L and 100R are shown in FIGS. Are recognized in different sizes.

At this time, when the display size confirmation targets 100L and 100R are confirmed to be displaced by half the line width as shown in FIG. 13, the unequal image viewing rate is 3.5%, as shown in FIG. When the display size confirmation targets 100L and 100R are confirmed to be displaced by one line width, the unequal image viewing rate is measured to be 7.0%. It is not always necessary to set the sizes of the display size confirmation targets 100L and 100R under such conditions.
(Resize)
The display size confirmation target 100L recognized by the left eye (left eye) is Ls, and the display size confirmation target 100R recognized by the right eye (right eye) is Rs. In the state where the left eye is smaller than the right eye (left eye <right eye) as shown in FIG. 13, when 7.0% inequality image rate is confirmed, display size Ls: display size Rs = 1: 1.07. For example, when there is such a relationship, the display size is changed as follows.

That is, since it is preferable that this size difference does not exist during optometry, the size of the target may be changed so as to cancel this size difference.

The size is changed by, for example, multiplying the left-eye image by 1.07 when both the left and right eyes are myopic, and multiplying the right-eye image by 1 / 1.07 when both the left and right eyes are farsighted. Further, if one of the left and right eyes is farsighted and the other is myopic, it is desirable to enlarge and reduce the left and right images almost equally. ) Times and 2 / (M + 1) times for hyperopic eyes.

On the other hand, as shown in FIG. 3 to FIG. 7 and FIG. 7A, the correcting lens is arranged at a position conjugate with the pupil (that is, a position that brings about the same effect as when the lens is arranged on the pupil). In the case of an optometer having a refractive optical system, the size difference during optometry does not occur. However, when actual glasses are worn, a size difference may occur.

For this reason, when checking the frequency after optometry, it is necessary to intentionally change the size of the target and display it in the same state as when wearing glasses. In this case, in the case of the above-mentioned conditions, the size of the left eye is simply multiplied by 1 / 1.07 if the myopia is myopia, and the right eye is 1.07 if the myopia is farsighted. If one of the left and right eyes is hyperopic and the other is myopic, it is desirable to enlarge and reduce the left and right images almost equally. The magnification obtained from the rate of unequal image vision is M, and the hyperopic eye is 2M / ( M + 1) times and myopic eyes should be 2 / (M + 1) times.

Note that the change in the display size as described above is performed by operating the examiner operation unit K of the input operation device Pc, which is the target operation device CLR shown in FIG. 2A, in the view shown in FIG. 8 (or FIG. 8A). The standard size correction unit 83 can perform this. That is, the operation at this time can be performed by the keyboard Kb or dial Da of the examiner operation unit K or the keyboard Kb and dial Da.
B. Changing the target size (display size confirmation target) based on the correction power The magnification M of the glasses is given by the following equation. That is, the magnification M of the glasses (glasses) is

It becomes.

Here, D ₁ is the front refractive power of the lens, D _b is the rear refractive power of the lens, t is the center thickness of the lens, n is the refractive index of the lens, and VD is the distance between the lens and the corneal apex.
Here, ignoring the center thickness t of the lens, the refractive power of the lens is D, and the magnification M can be expressed by the following equation. That is, the magnification M is

Can be expressed as

For example, when wearing the glasses of the right eye −2.00 (D) and the left eye +3.00 (D) using this formula (Formula 2), the magnification of the image viewed through the lens of each eye, and the image of the left and right eyes The magnification when comparing the sizes is as shown in Table 1 when VD = 12 (mm).

　 

That is, in an optometry apparatus having a conventional optical system (that is, an optical system in which unequal image vision occurs due to a difference in power), the above-mentioned right eye -2.00 (D), left eye +3 When a correction lens of .00 (D) is set, 6.2% unequal image vision occurs between the left and right eyes.

In general, it is said that good binocular vision cannot be obtained when unequal image vision of 3.5% or more occurs, but other than reducing the difference in lens power between the left and right or reducing the value of VD However, it was impossible to correct unequal image vision during optometry.

However, the present invention has a function of displaying the target separately on the left and right sides and changing the size of the target, so that the size difference between the left and right targets can be corrected during the optometry.

The correction may be performed so that the magnification of each eye becomes 1, so that each eye target (right and left eyes) visually recognizes the reciprocal of the magnification obtained in (Expression 2) as the magnification of the following (Expression 3). It is sufficient to apply to the display.

Note that this adjustment may be performed by setting the unequal image viewing rate as a threshold and automatically adjusting the size when the unequal image viewing rate calculated from the lens power exceeds the set value. Further, such a change in the display size is performed by operating the examiner operation unit K of the input operation device Pc which is the target operation device CLR shown in FIG. 2A, and the target shown in FIG. 8 (or FIG. 8A). This can be performed by the size correction unit 83. That is, the operation at this time can be performed by the keyboard Kb or dial Da of the examiner operation unit K or the keyboard Kb and dial Da. Furthermore, the size change at this time is as follows: The examiner asks the subject how to see the visual target (the size of the left and right visual targets is the same or which is larger) and responds to the response. It can also be executed by operating the examiner operation unit K by the examiner.

Next, in an optometry apparatus having an optical system in which the correction lens is arranged at a position conjugate with the pupil as shown in FIGS. 3 to 7 and 7A, VD = 0, so that the glasses shown in (Equation 2) The magnification M is always 1 and there is no difference in image size between the left and right eyes. Therefore, these inconveniences can be solved during optometry. On the other hand, at the time of confirmation after optometry, it is necessary to confirm the size difference between the left and right images depending on the correction power.

Therefore, when performing the final confirmation, the magnification calculated in (Equation 1) may be applied to the target to be visually recognized by each eye (left and right eyes).
(4). Contrast correction (change) for left and right targets
The contrast sensitivity of the human eye gradually decreases with aging, but if the contrast sensitivity decreases significantly on the left and right sides, the binocular visual function may be adversely affected and correct binocular vision may not be achieved. .

During optometry, if binocular vision is not possible correctly, it is necessary to determine whether the cause is due to a decrease in contrast sensitivity or due to other causes.

And, when a large gap is confirmed in the contrast sensitivity of the left and right eyes by inspection of the contrast sensitivity characteristics as exemplified below, the reason why binocular vision cannot be correctly performed is due to the decrease in contrast sensitivity, By changing (correcting) the contrast between the left and right visual targets, it is possible to achieve a certain balance between the contrast sensitivity of the left and right eyes.

For example, as shown in FIG. 15A, the left target Ldx whose left half is projected only to the left eye (left eye to be examined) is displayed on the left side of the left and right center line O2 on the liquid crystal display 53 of the left examination unit 5L. As shown in FIG. 15B, the right target Rdx whose right half is projected only to the right eye (right eye to be examined) is displayed on the right side of the left and right center line O2 on the liquid crystal display 53 of the right examination unit 5R. With such a display, when the left target Ldx and the right target Rdx are displayed on the left and right eyes of the subject and viewed simultaneously, the left and right eyes are normal and the left and right eyes are different in contrast sensitivity (viewing state). When there is no image, the appearance is as shown in FIG. 16, but when there is a large difference in contrast sensitivity (viewing state) between the left and right eyes, the appearance is as shown in FIG.

In FIG. 15A and FIG. 15B, the alphabet “ABC” is used for the left target Ldx and the right target Rdx. In FIG. 17, the contrast of the left target Ldx is brighter than the contrast of the right target Rdx (high sensitivity). ) State.

Therefore, increase the contrast of the target of the eye with the lower contrast sensitivity and adjust it until it looks almost the same on the left and right. In FIG. 17, since the contrast sensitivity of the right target Rdx is low, adjustment (change) is performed to increase the contrast sensitivity of the right target Rdx to the sensitivity of the left target Ldx.

In addition, such a contrast change is performed by operating the examiner operation unit K of the input operation device Pc, which is the target operation device CLR shown in FIG. 2A, and the target contrast shown in FIG. 8 (or FIG. 8A). This can be performed by the correction unit 84. That is, the operation at this time can be performed by the keyboard Kb or dial Da of the examiner operation unit K or the keyboard Kb and dial Da. Furthermore, the change of the contrast in this case is as follows. The examiner asks the subject how to see the target (whether the left and right target are the same brightness, which is brighter, etc.) and responds to the response. This can be executed by the examiner operating the examiner operation unit K.

Here, the finally adjusted value is stored, and in the binocular visual function test to be performed thereafter, it is preferable to display the visual target while maintaining this contrast state.

In objective refraction measurement, generally, light is incident on the eye, and the transmittance of the eye can be measured by measuring the difference between the intensity of the incident light and the intensity of the reflected light.
Then, the contrast adjustment function may be automatically performed by examining the correlation of how much difference occurs in the transmittance between the left and right eyes and how much difference occurs as the contrast sensitivity.
(5). Change (correction) of target display position
A. About the visual recognition state of the optotype due to eye misalignment The eye misalignment measurement is performed by using a composite image obtained by displaying different optotypes for the left eye and the right eye as shown in FIG. 18A and viewing them simultaneously.

That is, as shown in FIG. 18A, the left eye misalignment detection target Lm, which is a horizontal target line, is displayed on the liquid crystal display 53 of the inspection unit 5L, and the vertical target is displayed on the liquid crystal display 53 of the inspection unit 5R. The right eye misalignment detection target Rm, which is a line, is displayed. Then, the left eye misalignment detection target Lm and the right eye misalignment detection target Rm are simultaneously recognized by the left and right eyes of the subject, respectively, and the left eye misalignment detection target Lm and the right eye misalignment are detected. The eye position deviation is measured by causing the subject to recognize the detection target Rm as a composite image fused as shown in (i) to (iii) of FIG. 18B.

The left-eye misalignment detection target Lm has horizontal visual target lines Lm1 and Lm2 arranged in series at intervals in the left and right directions, and the right-eye misalignment detection target Rm is serially arranged at intervals in the vertical direction. Have vertical visual markings Rm1, Rm2.

In the example of FIGS. 18A and 18B, when there is no misalignment, the left eye misalignment detection target (horizontal target line) Lm) and the right eye misalignment detection target (vertical target line) Rm are Both cross at the center as shown in (i), but when there is a horizontal oblique position, an image shifted in the horizontal direction as shown in (ii), and when there is a vertical oblique position, it is shown in (iii). As shown, an image shifted in the vertical direction is observed.

Here, an example of the horizontal oblique position is shown in FIG. In FIG. 19, the left-eye shift detection target Lm (horizontal view target lines Lm1, Lm2) and the right-eye shift detection target Rm (vertical view target lines Rm1, Rm2) indicated by a large number of points This is how the target is perceived. If there is no eye misalignment and the left-eye misalignment detection target Lm and the right-eye misalignment detection target Rm indicated by diagonal lines are visible, the target perceived by the subject is the left eye The horizontal line (left eye misalignment detection target Lm) displayed on the (left eye to be examined) appears to be shifted to the right by the amount of misalignment x1, and the vertical line (right eye misalignment detection) displayed on the right eye (right eye to be examined). Since the target Rm) appears to be shifted to the left side by the amount of deviation x2, it can be seen that the subject is in the outer oblique position.
B. Display Correction of Visual Target Appearance Due to Eye Position Deviation Normally, a prism lens is used to correct the visual target deviation as shown in FIG. 19, but in the optometry apparatus according to the present embodiment, it is displayed on the left and right eyes. The prism lens can be substituted by changing the display position of the target.

That is, in the example of FIG. 19, the left-eye image (left-eye shift detection target Lm = horizontal target line Lm1, Lm2) indicated by a number of points is moved to the left by a shift amount x1. The right-eye image (right-eye shift detection target Rm = vertical visual target line Rm1, Rm2) indicated by a number of points is moved to the right by the shift amount x2, and the left-eye shift detection target (horizontal view) The standard line Lm and the right-eye misalignment detection target (vertical visual line) Rm may be adjusted to intersect at the center.

The prism lens unit is usually a prism diopter, but this definition is “1 prism diopter is the frequency of the prism that displaces an object located 1 m in front of the eye by 1 cm”. x1 and x2 can be converted into the correction data of the prism diopter from the displacement amount of the target and displayed. If this prism adaptation amount (prism diopter correction data) is determined, the prism adaptation amounts (prism diopter correction data) of the shift amounts x1 and x2 are stored in the memory M. In the subsequent inspection, based on the prism adaptation amount (prism diopter correction data) stored in the memory M, the left target displayed on the left inspection unit 5L and the liquid crystal display 53 is shown in FIG. As shown in FIG. 20B, the left target to be displayed on the right inspection unit 5R and the liquid crystal display 53 is shifted to the right by the amount x2 and displayed. The shift amounts x1 and x2 can be referred to as correction amounts.

Accordingly, as shown in FIGS. 20A and 20B, the visual target (for example, characters A and A) to be displayed on the left eye and the right eye in advance is shifted to the left and right eyes of the subject while being displaced left and right by the shift amounts x1 and x2. By displaying each of them, the composite image when simultaneously viewed with both eyes appears to be displayed in the center without deviation as shown in FIG. 20C.

Note that such correction of eye misalignment is performed by operating the examiner operation unit K of the input operation device Pc, which is the optotype operation device CLR shown in FIG. 2A, to display the eye shown in FIG. 8 (or FIG. 8A). This can be done by the misalignment correction unit 85. That is, the operation at this time can be performed by the keyboard Kb or dial Da of the examiner operation unit K or the keyboard Kb and dial Da. Furthermore, in this case, the examiner asks the examinee how to see the target (whether or not the left and right targets are misaligned, etc.) and responds to the response. It can be executed by operating the examiner operation unit K by the examiner.
C. An example of the above-described measurement of eye misalignment of A and an example of display correction of the appearance of the target of B include an oblique test (cross oblique test) as an example of the above-described measurement of eye misalignment. In this oblique test, the oblique amount is measured using the rotary prisms 55A and 55B of the inspection optical system in the inspection units 5L and 5R described above.
(Ca). 21. FIG. 21A shows a left-eye cruciform test chart target 71A that is the same as the left-eye misalignment detection target Lm, and FIG. 21B shows the above-described target 71A. The target 71B of the right-eye cruciform test chart, which is the same as the right-eye misalignment detection target Rm, is shown, and FIG. 22 shows how the targets 71A and 71B appear when viewed with both eyes with normal eyes. Table 2 shows how the oblique position looks.

　 

The arithmetic control circuit 63 ′ displays the visual targets 71A and 71B on the liquid crystal displays 53 and 53 of the left and right inspection units 5L and 5R, respectively. The targets displayed on the liquid crystal displays 53 and 53 of the inspection units 5L and 5R are the left eye (left eye) and the right eye via the rotary prisms 55A and 55B and the measurement optical system of the inspection units 5L and 5R, respectively. (Right eye to be examined) respectively.

As shown in FIG. 22, the normal eye 71A and the visual target 71B intersect at the center, but are separated when there is an oblique position. Further, the rotary prisms 55A and 55B are used for the oblique test, that is, for measuring the amount of prism necessary for the target 71A and the target 71B to intersect at the center as shown in FIG.

Incidentally, in the optometry program for the oblique test, the arithmetic control circuit 63 ′ is tilted (tilted) to the left or right (tilted) or tilted (tilted) according to the oblique test program (optimized program). The prism amount is continuously changed by rotating the rotary prisms 55A and 55B in opposite directions from the tilt signal from the tilt detection sensor 12b of the joystick lever 6h.

The rotary prisms 55A and 55B are provided so as to be rotatable in the reverse direction or the same direction by a drive motor Pdm such as a pulse motor as a drive device. The prism amount by the rotary prisms 55A and 55B can be detected from the number of drive pulses (drive amount) of the drive motor Pdm that rotates the rotary prisms 55A and 55B, respectively. Further, a rotation detection device (rotation angle detection unit) Rps such as a potentiometer or a rotary encoder linked to each of the rotary prisms 55A and 55B is provided, and an output signal (rotation signal) from the rotation angle detection device Rps is used as a rotary prism. The prism amount by 55A and 55B can also be detected.
(Cb). First, the target 71A of the cross oblique chart shown in FIG. 21A is displayed as the left eye misalignment detection target Lm on the liquid crystal display 53 of the inspection unit 5L, and the liquid crystal of the inspection unit 5R is displayed. The indicator 53B of the cross oblique chart shown in FIG. 21B is displayed on the display 53 as the right-eye shift detection target Rm. Thus, the cross oblique charts 71A and 71B of the cross oblique chart shown in FIGS. 21A and 21B are displayed on both eyes of the subject (the left examinee and the right examinee), respectively, and the cross oblique chart is set. .

At this time, the LED 53A shown in FIGS. 5 and 7 is turned on to display the fusion frame 53F on both eyes. The reason will be described below.

眼 There are oblique and oblique eye positions. Oblique position refers to a misalignment of the eye position in which the eyes of both eyes are correctly directed to the gazing object in daily life and the binocular single vision is always performed. . Further, the strabismus refers to a misalignment of the eye position in which the line of sight always shifts regardless of whether one eye is covered or not, and the gaze object is always double-viewed.

When a person with an oblique position, not a strabismus, looks at an object in nature, the object does not become a double image, but appears to overlap, so there is no problem in daily life. However, a left-eye optical system and a right-eye optical system are provided separately, and through each optical system, fusion stimulation (the subject's consciousness is difficult to concentrate on the target, and a conspicuous object that interferes with the examination) When an image without) is displayed on both eyes, it becomes clear that there is a misalignment.

In addition, even when the deviation between the visual target displayed on the left eye and the visual target displayed on the right eye is not clear, in the case of a visual acuity test with a single-character visual target with a narrow field of view, or in a near vision test performed with further convergence, It may happen that the target viewed with the left eye and the target viewed with the right eye cannot be fused.
(Cc). Oblique inspection (c1). When only two lines are visible (c1a). "Can you see four lines [vertical two lines (vertical line) and horizontal two lines (horizontal line)]? When you see, press button 6g on joystick lever 6h. If you see only two horizontal lines, If you can see the joystick lever 6h to the right or left and only the two vertical lines, push the joystick lever 6h forward or backward. "
(C1b). When the joystick lever 6h is tilted to the right or left, the image is not visually recognized by the right eye, and when the joystick lever 6h is tilted forward or backward, the oblique inspection cannot be performed correctly. In such a case, “tilt: precise examination (necessary inspection for oblique position required)” is stored and the oblique inspection is completed.
(C2). When the four lines are visible and normal (no normal position) (c2a). When the button 6g of the joystick lever 6h is pressed, “Do the centers of the horizontal and vertical lines overlap? If so, press the button 6g of the joystick lever 6h. If the tech lever 6h is to the right or left, please push the joystick lever 6h to the left. "
(C2b). When the button 6g is pressed, “skew: normal” is memorized and the skew check is terminated. When the joystick lever 6h is tilted to the right, both eyes are simultaneously set to the BO prism (inner oblique base out prism), and when it is tilted to the left, both eyes are simultaneously set to the BI prism (exterior oblique base in prism). (Table 2). At this time, the minimum unit of prism conversion is 0.25 (Δ).
(C3). When four lines are visible and there is a horizontal oblique position (c3a). On the other hand, when the joystick lever 6h is tilted to the right, “tilt the joystick lever 6h to the right or left until the vertical line matches the center position of the horizontal line, and then press the button 6g on the joystick lever 6h. . "
(C3b). Further, the number of times the joystick lever 6h is tilted to the right or left is counted until the button 6g of the joystick lever 6h is pressed. After defeating to the right and defeating to the left, deduct 0 times. When it is tilted to the right, it is BO (inner oblique position). When it is tilted to the left, it is BI (outer oblique position), and the number of times of tilting × 0.25 is the prism amount (Δ).
(C3c). Then, the horizontal oblique position “BO (or BI) Δ” is memorized.
(C3d). When the button 6g of the joystick lever 6h is pressed, “If the center of the horizontal line and the vertical line overlap? If it overlaps, press the button 6g of the joystick lever 6h. If the horizontal line is up, then joystick. If the lever 6h is up and down, please push down the joystick lever 6h. "
(C4). When four lines are visible and there is a vertical oblique position (c4a). When the joystick lever 6h is tilted up, the right eye is a BD prism, the left eye is a BU prism, and when it is tilted down, the right eye is a BU prism (base-up prism), and the left eye is a BD prism (base-down prism). (Table 2).
(C4b). “Turn the joystick lever 6h up or down until the vertical line and the center of the horizontal line overlap, and press the button 6g of the joystick lever 6h when they match.”
(C4c). Until the button 6g of the joystick lever 6h is pressed, the number of times the joystick lever 6h is tilted up or down is counted. After defeating up, if defeated down, deduct 0 times. The upper is an oblique position on the right eye, the lower is an oblique position on the upper left eye, and the number of times tilted in each direction × 0.25 is the prism amount (Δ).
(C4d). Then, the vertical oblique position “right eye BDΔ” or “left eye BDΔ” is stored.
D. The deviation amount of the target is calculated from the prism amount of the oblique test, and the correction of the target display center (target display position) on the liquid crystal display 53 of the target inspection units 5L and 5R. Is different for each subject, and is recorded as subject data in the database of the memory M together with the subject ID.

Then, the arithmetic control circuit 63 ′ reads the prism amount of the oblique test corresponding to the ID from the subject data when the subject's ID is inputted from a personal computer or the like, and the read oblique test. The display position of the target to be displayed on the liquid crystal displays 53, 53 of the inspection units 5L, 5R is corrected from the prism amount.

In this way, in the case of a subject with an oblique position, once the oblique position is inspected, it is not necessary to perform an oblique position test with the rotary prisms 55A and 55B from the next time. The visual target for the visual function test can be quickly displayed on the left and right eyes of the subject.

It is not always necessary to record (store) the prism amount by the oblique position test as described above. In other words, it is possible to measure the prism amount for each oblique test and convert the measured oblique amount to the target movement amount and display the target based on the converted target movement amount. is there.
E. In the case of an optometry apparatus provided with the measurement optical system (inspection optical system) in FIG. 7A In this case, in the oblique position test program, the horizontal direction of the inspection units 5L and 5R is set to the position of the far vision state.

Then, the fixation target or the image is displayed only on the liquid crystal display 53 of the inspection unit 5L, and the moving lens 57 of the inspection unit 5L is moved in the optical axis direction by the pulse motor PMa so that the fixation target or the image is displayed. The moving lens 57 is set at a position visible to the subject's left eye. Similarly, the fixation target or image or the like is displayed only on the liquid crystal display 53 of the inspection unit 5R, and the moving lens 57 of the inspection unit 5R is moved in the optical axis direction by the pulse motor PMa to fix the fixation target or image or the like. The moving lens 57 is set at a position that can be seen by the subject's right eye. These sets are performed separately for the left eye and the right eye.

When this setting is completed, as shown in FIG. 18A, the left-eye misalignment detection target Lm is displayed on the liquid crystal display 53 of the inspection unit 5L, and at the same time, the right side is displayed on the liquid crystal display 53 of the inspection unit 5R. The eye misalignment detection target Rm is displayed. As a result, the left eye misalignment detection target Lm and the right eye misalignment detection target Rm are displayed on both eyes of the subject (the left test eye and the right test eye), respectively, and a cross oblique chart set. Is done. Here, as described above, the left-eye shift detection target Lm is composed of a pair of horizontal target lines Lm1 and Lm2 that are horizontally spaced, and the right-eye shift detection target Rm is vertically spaced. It consists of a pair of vertical viewing marks Rm1, Rm2.

When the left eye misalignment detection target Lm and the right eye misalignment detection target Rm are visually recognized and fused by the left eye and the right eye, respectively, as shown in FIG. 23C, the left eye misalignment is detected. If the center of the detection target Lm (center between the horizontal target lines Lm1 and Lm2) Lo and the center of the right eye misalignment detection target Rm (center between the vertical target lines Rm1 and Rm2) Ro match As shown in FIG. 18B (i), there is no oblique position, and the oblique position test is completed by pressing the button 6g of the joystick lever 6h.

18B (ii) or (iii) when the left eye misalignment detection target Lm and the right eye misalignment detection target Rm are visually recognized by the left eye and the right eye, respectively, and fused. In other words, as shown in FIGS. 23A and 23B, the center of the left eye misalignment detection target Lm (the center between the horizontal target lines Lm1 and Lm2) Lo and the right eye misalignment detection target. If the center of Rm (the center between the vertical viewing marks Rm1 and Rm2) Ro is shifted x or y in the left-right or up-down direction, there is an oblique position.

When there is this oblique position, the joystick lever 6h is used to determine the amount of oblique position. At this time, when the joystick lever 6h is tilted to the left or right, the arithmetic control circuit 63 ′ shifts the display positions of the vertical visual lines Rm1 and Rm2 displayed on the liquid crystal display 53 of the inspection unit 5R to the left or right. When it is moved and the joystick lever 6h is tilted forward or backward, the display positions of the horizontal viewing lines Lm1 and Lm2 displayed on the liquid crystal display 53 of the inspection unit 5L are moved up or down.

Then, as shown in FIG. 23C, the center of the left-eye misalignment detection target Lm (center between the horizontal target lines Lm1 and Lm2) Lo and the center of the right-eye misalignment detection target Rm (vertical target line Rm1, (Center of Rm2) When the Ro matches, the button 6g of the joystick lever 6h is pressed to shift the left-eye displacement detection target Lm in the vertical direction (the oblique amount) and the right-eye displacement. A deviation amount (an oblique amount) of the detection target Rm in the left-right direction is obtained. The obtained shift amount (tilt amount) is stored in the subject data of the memory M together with the subject ID.

Further, in the case of the subject with this ID, it is displayed on the liquid crystal displays 53 and 53 of the examination units 5L and 5R based on the deviation amount (the oblique amount) stored in the subject data of the memory M. Correct the display position of the target.

Therefore, based on this correction, the same Landolt ring is displayed on the liquid crystal displays 53, 53 of the left and right inspection units 5L, 5R as shown in FIG. 24A, and the Landolt rings of the left and right liquid crystal displays 53, 53 are simultaneously displayed on the left eye. When viewed with the right eye, the subject sees it as one Landolt ring as shown in FIG. 24B.
(6) Change in horizontal rotation angle The eye misalignment correction described in “(5) Change in target display position” is the inspection shown in FIG. 2A instead of changing the display position of the target with respect to horizontal oblique position. It is also possible to obtain the same effect by rotating the units 5L and 5R.

In the case of an eye position shift as shown in FIG. 20, the image displayed on the left eye is shifted to the right side and the image displayed to the right eye is shifted to the left side compared to the normal position. ing. Therefore, in order to correct this appearance, the right-eye inspection unit opens the optical axis of the optical system to the outside, that is, turns the left-eye optical system built in the left-eye inspection unit 5L counterclockwise. What is necessary is just to rotate the optical system for right eyes incorporated in 5R clockwise, and to adjust to the state where a vertical line and a horizontal line cross in the center.

If the rotation angle of the optical system is obtained from the definition of the prism power, the prism power Pn can be obtained by the following (formula 4).

Pn = 100 × tan θ (Formula 4)
Pn: Prism power θ: Rotation angle of the device from the normal position When obtaining the left and right total prisms, θ is the total value of the right rotation angle and the left rotation angle.

As described above, the optometry apparatus according to the embodiment of the present invention includes the left inspection unit (left-eye inspection unit 5L) including the left inspection optical system that inspects the subject's left eye. A right inspection unit (right eye inspection unit 5R) having a built-in right inspection optical system for inspecting the examiner's right eye, and a left for displaying a left target on the left eye through the left inspection optical system An image display device (liquid crystal display 53 of the left eye inspection unit 5L) and a right image display device (of the right eye inspection unit 5R) that displays a right target on the right eye through the right inspection optical system. A liquid crystal display 53). In addition, the optometry apparatus includes the left image display device so that the visual inspection state of the left target visually recognized by the left eye and the right target visually recognized by the right eye is an optimal examination condition. The left target displayed on the liquid crystal display 53 of the left eye inspection unit 5L and the right target displayed on the right image display device (the liquid crystal display 53 of the right eye inspection unit 5R). An optotype display state correction unit 82 for individually correcting is provided. The liquid crystal display 53, which is an image display device, can also be called a visual target display device.

According to this configuration, it is possible to individually correct the visual target so that the visual recognition state by the eye to be examined can be correctly inspected.

Further, in the optometry apparatus according to the embodiment of the present invention, the target recording unit (memory M) that records a plurality of targets and the plurality of targets recorded in the target recording unit (memory M). A target selection unit 81 that selects the left target and the right target, and the left image display device and the right image display device that select the left target and the right target selected by the target selection unit 81. An arithmetic control circuit 63 ′ is provided for causing the liquid crystal displays 53 and 53 to display each independently.

According to this configuration, the target selection unit 81 selects a left target and a right target from a plurality of pre-recorded targets, and the arithmetic control circuit 63 ′ selects the selected left target and right target, respectively. Since it is displayed independently, the target can be easily corrected.

Furthermore, in the optometry apparatus according to the embodiment of the present invention, an optotype recording unit (memory M) in which a plurality of optotypes are recorded, and the plurality of optotypes recorded in the optotype recording unit (memory M). A target selection unit 81 that selects the left target and the right target, and the left image display device and the right image display device that select the left target and the right target selected by the target selection unit 81. An arithmetic control circuit 63 ′ is provided for causing the liquid crystal displays 53 and 53 to display each independently.

According to this configuration, even when the target operating device CLR is not operated, the target can be individually corrected.

Further, in the optometry apparatus according to the embodiment of the present invention, a visual target operation unit CLR that serves as both the visual target display state correction unit 82 and the visual target selection unit 81 is provided.

According to this configuration, since the operation for correcting the target and the operation for selecting the target can be performed by the target operation unit CLR, these operations can be facilitated.

Further, in the optometry apparatus according to the embodiment of the present invention, the visual recognition state is the left visual target visual size of the left visual target based on the refractive power of the left examined eye and the right visual target based on the refractive power of the right examined eye. It is the right target visual recognition size. Moreover, the optotype display state correcting unit 82 sets the left image display device (the left eye inspection unit 5L of the left eye inspection unit 5L) such that the left visual target visual recognition size and the right visual target visual recognition size are the same as the optimal inspection condition. The display size of the left target displayed on the liquid crystal display 53) and the display size of the right target displayed on the right image display device (the liquid crystal display 53 of the right-eye test unit 5R) are set to the left. A target size correction unit 83 that individually corrects based on the refractive power of the eye to be examined and the refractive power of the right eye to be examined is provided.

According to this configuration, in the inspection apparatus having the refractive error correction optical system in front of the eyes, like the glasses, the size of the target image can be individually changed between the left and right eyes, so that an unequal image is obtained during the optometry. The target size can be changed and presented so as to negate the view.

In the optometry apparatus according to the embodiment of the present invention, the visual recognition state is the left visual target visual recognition size of the left visual target based on the correction power of the left test eye and the right visual test based on the correction power of the right test eye. The right target visual recognition size. Moreover, the optotype display state correcting unit 82 sets the left image display device (the left eye inspection unit 5L of the left eye inspection unit 5L) such that the left visual target visual recognition size and the right visual target visual recognition size are the same as the optimal inspection condition. The display size of the left target displayed on the liquid crystal display 53) and the display size of the right target displayed on the right image display device (the liquid crystal display 53 of the right-eye test unit 5R) are set to the left. A target size correction unit 83 that individually corrects based on the correction power of the eye to be examined and the correction power of the right eye to be examined is provided.

According to this configuration, in the inspection apparatus in which the refractive error correction optical system is arranged at a position conjugate with the pupil, the size of the target image can be changed individually by the left and right eyes, so that the frequency after completion of the optometry At the time of confirmation, it can be presented in the size when wearing glasses.

Furthermore, in the optometry apparatus according to the embodiment of the present invention, the visual recognition states are a left visual target visual contrast of the left visual target by the left eye and a right visual visual recognition contrast of the right eye by the right eye. . Moreover, the optotype display state correcting unit 82 sets the left image display device (inspection unit 5L for the left eye) so that the left visual target visual contrast and the right visual target visual contrast become the same as the optimal inspection condition. The contrast of the left visual target displayed on the liquid crystal display 53) and the contrast of the right visual target displayed on the right image display device (the liquid crystal display 53 of the right eye inspection unit 5R) are individually corrected. A target contrast correction unit 84 is provided.

According to this configuration, the brightness and contrast of the target image can be changed individually for the left and right eyes, making it possible to perform optometry while reducing the difference in contrast sensitivity between the left and right eyes, especially during binocular visual function testing. Works (functions).

In the optometry apparatus according to the embodiment of the present invention, the visual recognition state is a visual target visual position shift caused by a positional shift between the left eye to be examined and the right eye to be examined, and the left visual target by the left eye to be examined. The left visual target visual recognition position and the right visual target visual recognition position of the right visual target by the right eye to be examined are misaligned. Moreover, the optotype display state correcting unit 82 is configured to use the left image display device (left) so that the visual target visual position shift between the left visual target visual recognition position and the right visual target visual recognition position does not occur as the optimum inspection condition. The display position of the left target displayed on the liquid crystal display 53 of the eye inspection unit 5L and the right target displayed on the right image display device (the liquid crystal display 53 of the right eye inspection unit 5R). An eye misalignment correction unit 85 that individually corrects the display position is provided.

According to this configuration, the vergence / divergence test (inspection of eyeball rotation), the misalignment test, etc. can be performed without using the prism lens, and the misalignment can be corrected without using the prism lens during the inspection. Therefore, inspection can be performed without being affected by chromatic aberration caused by the prism lens.

Further, in the optometry apparatus according to the embodiment of the present invention, the visual recognition state is a visual target visual position shift caused by a lateral shift of the left eye and the right eye, and depends on the left eye. It is a visual target visual position shift in the fusion state of the left visual target visual recognition position of the left visual target and the right visual target visual recognition position of the right visual target by the right eye to be examined. Also, a left unit driving device (Ld) that horizontally rotates the left examination unit (left eye examination unit 5L) around the center of rotation of the left eye to be examined, and the right examination unit (right eye examination unit 5R) are arranged to the right. A right unit driving device (Rd) that rotates horizontally around the rotation center of the eye to be examined; In addition, the optotype display state correcting unit 82 is configured so that the left visual unit visual position does not shift in the left-right direction between the left visual target visual recognition position and the right visual target visual recognition position as the optimum inspection condition. The left inspection unit (left eye inspection unit 5L) and the right inspection unit (right eye inspection unit 5R) are individually horizontally turned by controlling the drive device (Ld) and the right unit drive device (Rd). By doing so, the left target displayed on the left image display device (liquid crystal display 53 of the left eye inspection unit 5L) and the right image display device (liquid crystal display 53 of the right eye inspection unit 5R) are displayed. An eye misalignment correction unit 85 that individually corrects the position of the displayed right visual target is provided.

According to this configuration, the vergence / divergence test (inspection of eyeball rotation), the misalignment test, etc. can be performed without using the prism lens, and the misalignment can be corrected without using the prism lens during the inspection. Therefore, inspection can be performed without being affected by chromatic aberration caused by the prism lens.

In the above-described embodiments, the present invention is applied to the optometry apparatus 2 including the inspection units 5L and 5R provided with the refractive power measurement optical systems 33L and 33R. However, the present invention is not necessarily limited thereto. . The present invention may be applied to a configuration in which the refractive power measurement optical systems 33L and 33R are excluded from the inspection units 5L and 5R of the inspection unit 2.
[Cross-reference to related applications]

This application claims priority based on Japanese Patent Application No. 2009-110872 filed with the Japan Patent Office on April 30, 2009, the entire disclosure of which is fully incorporated herein by reference.

Claims (9)

1. A left inspection unit with a built-in left inspection optical system that inspects the left eye of the subject;
   A right inspection unit with a built-in right inspection optical system for inspecting the subject's right eye;
   A left image display device for displaying a left target on the left eye to be examined via the left inspection optical system;
   A right image display device for displaying a right target on the right eye through the right examination optical system;
   The left vision displayed on the left image display device so that the visual inspection state of the left visual target visually recognized by the left eye and the right visual target visually recognized by the right eye is an optimal examination condition. A target display state correction unit that individually corrects the target and the right target displayed on the right image display device;
   An optometry apparatus is provided.
2. A target recording unit in which a plurality of targets are recorded;
   A target selection unit that selects the left target and the right target from the plurality of targets recorded in the target recording unit;
   An arithmetic control circuit that causes the left image display device and the right image display device to independently display the left target and the right target selected by the target selection unit;
   The optometry apparatus according to claim 1, wherein the optometry apparatus is provided.
3. 3. The optometry apparatus according to claim 2, further comprising an optotype operation unit that serves as both the optotype display state correction unit and the optotype selection unit.
4. A target recording unit in which a plurality of targets are recorded;
   A target selection unit that selects the left target and the right target from the plurality of targets recorded in the target recording unit;
   The optotype selection unit and the optotype display state correction unit have the left optotype and the right optotype selected by the optotype selection unit independent of the left image display device and the right image display device, respectively. A calculation control circuit to be displayed,
   The optometry apparatus according to claim 1, wherein the optometry apparatus is provided.
5. 5. The optometry apparatus according to claim 1, wherein the visual recognition state is a left visual target visual recognition size of the left visual target and a refractive power of the right test eye based on the refractive power of the left examined eye. The right target visual recognition size of the right target based on
   The target display state correcting unit displays the left target displayed on the left image display device so that the left target visual recognition size and the right target visual recognition size are the same as the optimum inspection condition. There is provided a target size correction unit that individually corrects the size and the display size of the right target displayed on the right image display device based on the refractive power of the left eye and the refractive power of the right eye. An optometry apparatus characterized by comprising:
6. 5. The optometry apparatus according to claim 1, wherein the visual recognition state is a left visual target visual recognition size of the left visual target based on a correction power of the left test eye and a correction power of the right test eye. The right target visual recognition size of the right target based on
   The target display state correcting unit displays the left target displayed on the left image display device so that the left target visual recognition size and the right target visual recognition size are the same as the optimum inspection condition. There is provided a target size correction unit for individually correcting the size and the display size of the right target displayed on the right image display device based on the correction power of the left eye and the correction power of the right eye. An optometry apparatus characterized by comprising:
7. 5. The optometry apparatus according to claim 1, wherein the visual recognition state includes a left visual target visual contrast of the left visual target by the left eye and a right eye of the right visual target by the right eye. The visual target contrast,
   The visual target display state correction unit is configured to contrast the left visual target displayed on the left image display device so that the left visual target visual contrast and the right visual target visual contrast become the same as the optimal inspection condition. And an eye contrast correction unit for individually correcting the contrast of the right eye displayed on the right image display device.
8. In the optometry apparatus according to any one of claims 1 to 4,
   The visual recognition state is a visual target visual position shift caused by an eye position shift between the left eye to be examined and the right eye to be examined, and the left visual target visually recognized position of the left visual target by the left eye to be examined and the right eye to be examined. It is a visual target visual position shift in a fusion state with the right visual target visual recognition position of the right visual target,
   The target display state correction unit is displayed on the left image display device so as not to cause a target target visual position shift between the left target visual recognition position and the right target visual recognition position as the optimum inspection condition. An optometry apparatus, comprising an eye misalignment correction unit that individually corrects a display position of a left visual target and a display position of the right visual target displayed on the right image display device.
9. In the optometry apparatus according to any one of claims 1 to 4,
   The visual recognition state is a visual target visual position shift caused by a horizontal positional shift between the left eye to be examined and the right eye to be examined. The left visual target visually recognized position of the left visual target by the left examined eye and the right eye The visual target visual position shift in the fusion state of the right visual target visual recognition position of the right visual target by the eye to be examined,
   A left unit driving device that horizontally rotates the left examination unit to the center of rotation of the left eye and a right unit driving device that horizontally rotates the right examination unit to the center of rotation of the right eye. ,
   The target display state correction unit includes the left unit driving device and the left unit driving device so as not to cause a target target visual position shift in a left-right direction between the left target visual recognition position and the right target visual recognition position as the optimum inspection condition. Displaying the left target displayed on the left image display device and the right image display device by horizontally controlling the left inspection unit and the right inspection unit individually by controlling the operation of the right unit driving device. An optometry apparatus, comprising: an eye misalignment correction unit that individually corrects the position of the right visual target.
   

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