JP7178474B2 - Optometry equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an optometry apparatus having an optotype presenting optical system and a control unit.

2. Description of the Related Art Conventionally, an eye examination apparatus such as that disclosed in Patent Document 1, for example, is known as an eye examination apparatus having an optotype presenting optical system and a control unit. An overview of the conventional optometry apparatus disclosed in Patent Document 1 will be described with reference to FIGS. 14 and 15. FIG.

14 and 15 are diagrams for explaining a conventional optometry apparatus. FIG. 14 shows a schematic block diagram of the optical system for the right eye of the main body 5R, and FIG. 15 shows the detailed configuration of the optical system for the right eye. showing. Since the configuration of the left-eye optical system of the main body 5L is the same as that of the right-eye optical system, the description thereof will be omitted, and only the right-eye optical system will be described.

As shown in FIGS. 14 and 15, the right-eye optical system 120, which is an optotype presenting optical system, includes an optotype projecting optical system g' for adjusting the distance between the subject's eye E and the main body 5R, and a plurality of rings. It has a ring pattern projection optical system f' that projects a pattern toward the cornea of the eye E to be examined.

The target projection optical system g' has a pair of LEDs 121 and 122 and a pair of projection lenses 123 and 124, respectively, as shown in FIG. Target luminous fluxes from the LEDs 121 and 122 of the target projection optical system g' are projected onto the cornea of the subject's eye E from two oblique directions via the mirror 125 .

The ring pattern projection optical system f' has a ring illumination light source 127 and a ring pattern 126, as shown in detail in FIG. projected onto. The ring pattern projection optical system f' is also used as an anterior segment illumination light source.

Further, as shown in FIG. 15, the optical system 120 for the right eye includes a light receiving optical system a' for observing the anterior eye, aligning the main body 5R with respect to the eye to be examined, and measuring the corneal curvature distribution, and the refractive index of the eye E to be examined. Optical target projection optical system for refractive power measurement b' for projecting a target for measuring force onto the fundus oculi Ef, light receiving optical system c' for receiving the reflected light flux from the fundus oculi Ef, fixation and cloudy vision on the eye E to be examined. and a direction orthogonal to the optical axis of the objective lens 110 of the eye to be examined E and the main body 5R, that is, alignment in the vertical and horizontal directions. It has a target projection optical system e' for projecting a target.

The visual target projection optical system e' consists of a visual target LED 128 and a dichroic mirror 129. FIG. The target light flux from the target LED 128 is reflected by the dichroic mirror 129 , passes through the dichroic mirror 130 , and is projected onto the cornea of the subject's eye E via the objective lens 110 and mirror 125 .

The light-receiving optical system a' has an objective lens 110, a dichroic mirror 130, a diaphragm 131, relay lenses 132 and 133, a dichroic mirror 134, an imaging lens 135, and an imaging device 136. The diaphragm 131 is arranged at the focal position of the objective lens 110 and used as a so-called telecentric diaphragm. A light ray passing through the center of the diaphragm 131 is parallel to the optical axis of the objective lens 110 on the subject's eye.

Reflected light from the cornea by the target light flux from the target projection optical system e', scattered reflected light from the cornea and the anterior segment by the ring pattern 126 of the ring pattern projection optical system f', and from the target projection optical system g' The reflected light from the cornea by the target light beam is received by the imaging device 136 via each optical element of the light receiving optical system a'. The received image output of the imaging element 136 is input to a control section 137 having a monitor.

The visual target projection optical system d' includes a lamp 138, a collimator lens 139, a rotating plate 140, a mirror 141, a relay lens 142, a mirror 143, a movable lens 144 for adjusting the diopter of the subject's eye, relay lenses 145 and 146, and correction for astigmatism. variable cross cylinders 147 and 148, a mirror 149, and a dichroic mirror 150.

A rotating plate 140 is rotationally driven by a motor 151, and is provided with a fixation target 152, a Landolt's ring, and the like. A fixation target 152 passes through a mirror 141 , a relay lens 142 , a mirror 143 , a moving lens 144 , relay lenses 145 and 146 , variable cross cylinders 147 and 148 , dichroic mirrors 150 and 130 , an objective lens 110 and a mirror 125 . projected onto E.

The optotype projection optical system for refractive power measurement b′ has a measurement light source unit 164 , a relay lens 157 , a pupil ring diaphragm 158 and a triangular prism 159 . The measurement light source unit 164 has an eye refractive power measurement light source 153 , a relay lens 154 , a conical prism 155 and a measurement ring target 156 . A pupil ring diaphragm 158 is a ring-shaped diaphragm formed in the lens by etching. A pupil ring diaphragm 158 is arranged at a position conjugate with the pupil of the eye E to be examined.

The measuring light beam reflected by the fundus Ef of the eye to be examined E passes through the mirror 125, the objective lens 110, the dichroic mirrors 130 and 150, and the triangular prism 159 and is guided to the light receiving optical system c'.

The light receiving optical system c' has a triangular prism 159, a mirror 160, a relay lens 161, a moving lens 162 and a mirror 163. The moving lens 162 is moved according to the refractive power of the eye E to be examined. The measurement light beam reflected by the fundus oculi Ef passes through the central portion 159a of the triangular prism 159, is reflected by the mirror 160, passes through the relay lens 161, the moving lens 162, the mirror 163, the dichroic mirror 134, and the imaging lens 135, and reaches the imaging device. 136 is imaged. A surface 159c of the triangular prism 159 opposite to the reflecting surface 159b is provided at a conjugate position with the pupil so that the reflected luminous flux from the fundus Ef coming out of the pupil becomes a luminous flux passing only through the central optical axis of the triangular prism 159. is etched.

WO2003/041571

However, in the conventional optometry apparatus disclosed in Patent Document 1, the fixation target 152 is fixed, that is, is single and immovable. In other words, it is necessary to guide the examinee to fix his gaze at infinity (for example, the examiner gives instructions to the examinee by voice), and it is necessary to actually fix the line of sight of the examinee. It took time.

In addition, in the conventional optometry apparatus, projection of the fixation target and projection of the cross cylinder are performed by the common target projection optical system d', so there is a possibility that the structure of the entire target projection optical system d' becomes complicated. In addition, there is a possibility that the projection of the cross cylinder cannot be performed reliably.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an optometry apparatus that can reliably fix the line of sight to a fixation target and can reliably project a cross cylinder. to do.

In order to achieve the above object, the optometry apparatus of the present invention comprises a target presenting optical system and a control section, and the target presenting optical system receives a fixation target for causing fixation of the line of sight of the subject's eye. A fixation target optical system to be presented for eye examination shares an optical axis with this fixation target optical system, and a predetermined amount of astigmatism is generated for the astigmatism test target to receive a pair of astigmatism test target images. A fixed fixation target optical system for presenting the fixed fixation target to the eye to be examined, and a fixed fixation target optical system for presenting the fixed fixation target to the eye to be examined, and an optical axis shared with the fixed fixation target optical system. and a variable optotype optical system for presenting a variable optotype displayed by the display unit to the eye to be examined, the control unit having a display control unit for displaying the variable optotype on the display unit, The cross-cylinder optical system includes a beam dividing member that divides a beam for projecting the astigmatism test target into a pair of beams having different axis angles, and a beam splitting member that divides the beam for projecting the astigmatism test target into a pair of beams having different axis angles, a target projection unit for projecting a target image onto the eye to be inspected; the fixation target optical system and the cross cylinder optical system are merged to share an optical axis; is provided at a position before joining the fixation target optical system in the cross cylinder optical system, and the target projection unit is provided at a position after joining the fixation target optical system in the cross cylinder optical system It is provided at a position and shared by the fixation target optical system and the cross cylinder optical system.

Here, the fixed fixation target and the variable target can be configured so as to form an integral figure when presented to the subject's eye. Also, the fixed fixation target and the variable target can be configured so that they are presented to the subject's eye overlappingly at least at their central portions. Furthermore, the display control section can be configured to display a continuously changing variable target on the display section.

The fixed fixation target optical system includes a fixation target light source that illuminates the fixed fixation target, and/or a fusion frame light source that illuminates a fusion frame provided on the periphery of the fixed fixation target, and / Alternatively, it may be configured to have a light source for glare provided in the peripheral portion of the fixed fixation target.

Further, it is possible to have a first input section for receiving an input of an examination instruction, and the display control section can be configured to display a variable optotype including the examination instruction received by the first input section on the display section.

A second input unit for receiving a coordinate instruction on the variable target corresponding to the input of the examination instruction is provided, and the control unit includes a coordinate position detection unit for detecting the coordinate position of the coordinate instruction on the variable target. can be configured.

In the optometry apparatus of the present invention configured as described above, the target presenting optical system includes a fixation target optical system for presenting the eye to be inspected with a fixation target for causing fixation of the line of sight of the eye to be inspected, and this fixation target optical system. a cross-cylinder optical system that shares an optical axis with the optotype optical system and presents a pair of astigmatism-testing optotype images to the subject's eye by generating a predetermined amount of astigmatism in the astigmatism-testing optotype; The fixation target optical system includes a fixed fixation target optical system that presents a fixed fixation target to the eye to be examined, and a variable vision system that shares an optical axis with the fixed fixation target optical system and is displayed by a display unit. a variable target optical system for presenting a target to an eye to be inspected, and a control unit having a display control unit for causing a display unit to display the variable target.

Therefore, the fixation target presented to the subject's eye by the fixed fixation target optical system and the variable target optical system, and the astigmatism test target image presented to the subject's eye by the cross-cylinder optical system are diversified. Therefore, it is possible to reliably perform fixation of the line of sight on the fixation target, and to reliably perform projection of the cross cylinder.

Here, since the fixed fixation target and the variable target are configured to form an integral figure when presented to the subject's eye, the fixation of the line of sight to the fixation target can be performed more reliably. be able to.

In addition, since the fixed fixation target and the variable target are presented to the subject's eye so as to overlap at least their central portions, it is possible to more reliably fix the line of sight to the fixation target.

Furthermore, since the display control unit causes the display unit to display the continuously changing variable visual target, the fixed visual target optical system and the variable visual target optical system can provide a greater variety of fixation targets presented to the subject's eye. and fixation of the line of sight to the fixation target can be performed more reliably.

The fixed fixation target optical system includes a fixation target light source that illuminates the fixed fixation target, and/or a fusion frame light source that illuminates a fusion frame provided on the periphery of the fixed fixation target, and / Or to further diversify the fixation target presented to the subject's eye by the fixed fixation target optical system and the variable target optical system, since the glare light source is provided in the peripheral portion of the fixed fixation target. This makes it possible to fix the line of sight to the fixation target more reliably.

Further, the cross-cylinder optical system includes a beam splitting member that splits a beam for projecting the astigmatism test target into a pair of beams having different axial angles, and a pair of astigmatism test targets separated from each other. Since it has a visual target projection unit that projects an image onto the subject's eye, projection of the cross cylinder can be performed reliably.

Further, the first input section for receiving the input of the examination instruction is provided, and the display control section causes the display section to display the variable optotype including the examination instruction received by the first input section. is reduced, and erroneous answers by the subject can be suppressed, shortening the measurement time, and improving workability.

A second input unit for receiving a coordinate instruction on the variable target corresponding to the input of the examination instruction is provided, and the control unit includes a coordinate position detection unit for detecting the coordinate position of the coordinate instruction on the variable target. As a result, the burden on the subject can be reduced, and the subject's wrong answers can be suppressed, the measurement time can be shortened, and the workability can be improved.

1 is a perspective view showing the overall configuration of an optometric apparatus according to this embodiment; FIG. 1 is a diagram showing a schematic configuration of an optical system of an optometric apparatus according to this embodiment; FIG. FIG. 3 is a diagram showing a detailed configuration of a right-eye measurement optical system of the optometric apparatus according to the present embodiment; It is a figure which shows the detailed structure of a target optical part. FIG. 4 is a diagram showing the detailed configuration of the light source of the fixed fixation target optical system; FIG. 4 is a diagram for explaining the action of the prism-equipped cross cylinder in the optotype projection system; 1 is a block diagram showing the overall configuration of an optometric apparatus according to this embodiment; FIG. 2 is a block diagram showing the configuration of the control system of the optometric apparatus according to the present embodiment; FIG. FIG. 2 is a diagram showing an example of a fixed fixation target presented to an eye to be examined by the optometry apparatus according to the present embodiment; 1 is a diagram showing an example of a target presented to an eye to be examined by an eye examination apparatus according to the present embodiment; FIG. FIG. 10 is a diagram showing another example of a visual target presented to the subject's eye by the optometric apparatus according to the present embodiment; 4A and 4B are diagrams for explaining the operation of the optometric apparatus according to the present embodiment; FIG. FIG. 10 is a diagram showing yet another example of a visual target presented to the eye to be examined by the optometry apparatus according to the present embodiment; 1 is a diagram showing a schematic configuration of an optical system of a conventional optometric apparatus; FIG. FIG. 10 is a diagram showing a detailed configuration of a right-eye measuring optical system of a conventional optometry apparatus;

An optometry apparatus according to the present embodiment will be described below with reference to FIGS. 1 to 13. FIG. First, the overall configuration of the optometric apparatus 10 will be described.
(Overall Configuration of Optometry Apparatus)

The optometric apparatus 10 includes a base 11, an optometric table 12, a column 13, an arm 14, a driving mechanism 15, and a pair of measuring heads 16, as shown in FIG. In the optometry apparatus 10 , the subject facing the optometry table 12 holds the forehead support 17 provided between the two measurement heads 16 , and obtains information about the eye to be examined of the subject. In addition, as shown in FIG. 1 throughout this specification, the X axis, Y axis, and Z axis are taken, and when viewed from the subject, the horizontal direction is the X direction, the vertical direction (vertical direction) is the Y direction, and the X direction is And the direction perpendicular to the Y direction (depth direction of the measuring head 16) is defined as the Z direction.

The optometry table 12 is a desk on which an examiner controller 25 and a subject controller 26, which will be described later, are placed, and items used for optometry are placed, and is supported by the base 11 . The optometric table 12 may be supported by the base 11 so that its position in the Y direction (height position) can be adjusted.

The post 13 is supported by the base 11 so as to extend in the Y direction at the rear end of the optometry table 12, and has an arm 14 at its tip.

The arm 14 suspends both measuring heads 16 on the optometry table 12 via the drive mechanism 15, and extends from the support 13 toward the front side in the Z direction. The arm 14 is movable in the Y direction with respect to the column 13 . In addition, the arm 14 may be movable in the X direction and the Z direction with respect to the column 13 . A pair of measuring heads 16 are suspended from the tip of the arm 14 by a drive mechanism 15 and supported.

The measuring heads 16 are provided in pairs so as to individually correspond to the left and right eyes of the subject, and hereinafter, the left eye measuring head 16L and the right eye measuring head 16R will be referred to individually. . The left eye measurement head 16L acquires information on the left eye of the subject, and the right eye measurement head 16R acquires information on the right eye of the subject. The left-eye measurement head 16L and the right-eye measurement head 16R are configured to be symmetrical with respect to a vertical plane positioned between them in the X direction.

Each measuring head 16 is provided with a mirror 18 as a deflecting member, and through the mirror 18, a measuring optical system 21, which will be described later, acquires information on the corresponding subject's eye.

Each measurement head 16 is provided with a measurement optical system 21 (to be referred to as a right eye measurement optical system 21R and a left eye measurement optical system 21L when individually described) that acquires eye information of an eye to be examined. A detailed configuration of the measurement optical system 21 will be described later.

Both measuring heads 16 are movably suspended by a drive mechanism 15 provided on a base portion 19 suspended from the tip of the arm 14 . In this embodiment, as shown in FIG. 7, the drive mechanism 15 includes a left-eye vertical drive section 22L, a left-eye horizontal drive section 23L, and a left-eye rotational drive section 24L corresponding to the left-eye measurement head 16L. , a right-eye vertical drive section 22R, a right-eye horizontal drive section 23R, and a right-eye rotational drive section 24R corresponding to the right-eye measurement head 16R.

The configuration of each drive unit corresponding to the left-eye measurement head 16L and the configuration of each drive unit corresponding to the right-eye measurement head 16R are symmetrical with respect to a vertical plane positioned between them in the X direction. They are simply referred to as a vertical drive section 22, a horizontal drive section 23 and a rotary drive section 24 unless otherwise specified.

The vertical drive section 22 is provided between the base section 19 and the horizontal drive section 23 and moves the horizontal drive section 23 in the Y direction (vertical direction) with respect to the base section 19 . The horizontal drive section 23 is provided between the vertical drive section 22 and the rotary drive section 24, and moves the rotary drive section 24 with respect to the vertical drive section 22 in the X direction and the Z direction (horizontal direction).

The vertical driving section 22 and the horizontal driving section 23 are provided with an actuator such as a pulse motor for generating driving force, and a transmission mechanism such as a combination of gears or a rack and pinion for transmitting the driving force. consists of The horizontal driving unit 23 can be easily configured and can easily control horizontal movement by providing a combination of actuators and transmission mechanisms separately for the X direction and the Z direction, for example.

The rotation drive unit 24 rotates the corresponding measurement head 16 with respect to the horizontal drive unit 23 around the eyeball rotation axis of the corresponding subject's eye. For example, the rotation drive unit 24 has a configuration in which a transmission mechanism that receives a driving force from an actuator moves along an arc-shaped guide groove. The measurement head 16 is rotated around the eyeball rotation axis of .

The rotary drive unit 24 may support the measuring head 16 so as to be rotatable around its own rotation axis, and cooperate with the horizontal drive unit 23 to rotate the measuring head 16 while changing the supporting position. good.

As a result, the drive mechanism 15 can move the measurement heads 16 in the X, Y, and Z directions individually or in conjunction with each other, and rotate them about the eyeball rotation axis of the subject's eye. .

(Optical system of optometric device)
FIG. 2 is a diagram showing a schematic configuration of the optical system of the optometric apparatus according to the present embodiment, and FIG. 3 is a diagram showing a detailed configuration of the right-eye measurement optical system 21R. Since the configuration of the left-eye measurement optical system 21L is the same as that of the right-eye measurement optical system 21R, the description thereof will be omitted, and only the right-eye measurement optical system 21R will be described.

As shown in FIG. 3, the right eye measurement optical system 21R includes an observation system 31, a target projection system (fixation target optical system) 32, an eye refractive power measurement system 33, and a subjective examination system (cross cylinder optical system). 34 , an alignment system 35 , an alignment system 36 and a Kerato system 37 .

The observation system 31 observes the anterior segment of the eye E to be examined, the target projection system 32 presents a target to the eye E to be examined, the eye refractive power measurement system 33 measures the refractive power of the eye, and is a subjective examination system. 34 performs a subjective test.

In this embodiment, the eye refractive power measurement system 33 has a function of projecting a predetermined measurement pattern onto the fundus Ef of the eye to be examined E and a function of detecting an image of the measurement pattern projected onto the fundus Ef. In this embodiment, the subjective examination system 34 has a function of presenting an optotype to the eye to be examined E, and shares the optical elements constituting the optical system with the optotype projection system 32 .

Alignment systems 35 and 36 perform alignment of the optical system with respect to the eye E to be examined. Alignment is performed in directions (vertical direction, horizontal direction) perpendicular to each other.

The observation system 31 has an objective lens 31a, a dichroic filter 31b, a half mirror 31c, a relay lens 31d, a dichroic filter 31e, an imaging lens 31f, and an imaging device (CCD) 31g.

In the observation system 31, the luminous flux reflected by the subject's eye E (anterior segment) passes through the objective lens 31a and forms an image on the imaging element 31g by the imaging lens 31f. As a result, an anterior ocular segment image E′ is formed on the imaging device 31g by projecting (projecting) a keratling light flux, a light flux from the alignment light source 35a, and a light flux (bright spot image Br) from the alignment light source 36a, which will be described later. be. The control unit 27 causes the display screen 29a of the display unit 29 to display an anterior segment image E′ based on the image signal output from the imaging device 31g.

A kerat system 37 is provided in front of the objective lens 31a. Kerato system 37 comprises a kerato plate 37a and a kerato ring light source 37b. The keratoplate 37a has a plate shape provided with a slit concentric with respect to the optical axis of the observation system 31, and is provided near the objective lens 31a. The keratizing light source 37b is provided in alignment with the slit of the keratoplate 37a.

In the kerato system 37, a light flux from a lighted keratizing light source 37b passes through the slit of the kerato plate 37a, so that a keratling light flux (corneal curvature measuring ring shape) for measuring the shape of the cornea is directed to the subject's eye E (cornea Ec). Target) is projected (projected). The keratling luminous flux is reflected by the cornea Ec of the eye E to be examined, and is imaged on the imaging device 31g by the observation system 31 . As a result, the image sensor 31g detects (receives) an image (image) of the ring-shaped keratling light flux, and the control unit 27 causes the display screen 29a to display the image of the measurement pattern, and the image (the image sensor 31g ), the corneal shape (curvature radius) is measured by a known technique.

In this embodiment, an example (kerat system 37) using a keratoplate 37a for measuring the curvature near the center of the cornea with one to three ring slits is shown as the corneal topography measurement system. As long as the corneal shape is measured, a placide plate having multiple rings and capable of measuring the shape of the entire cornea may be used, or other configurations may be used, and the configuration is not limited to the configuration of this embodiment.

An alignment system 35 is provided behind the kerat system 37 (kerat plate 37a) (see FIG. 2). The alignment system 35 has a pair of an alignment light source 35a and a projection lens 35b. A light beam from each alignment light source 35a is made into a parallel light beam by each projection lens 35b, and the cornea of the eye E to be examined passes through an alignment hole provided in a kerato plate 37a. The parallel luminous flux is projected (projected) onto Ec.

The control unit 27 or the examiner moves the measurement head 16 in the front-rear direction based on the luminescent spot (the luminescent spot image) projected onto the cornea Ec, thereby moving the measurement head 16 in the direction along the optical axis of the observation system 31 ( fore-and-aft direction) alignment. This alignment in the longitudinal direction is performed by adjusting the position of the measuring head 16 so that the ratio of the distance between the two point images by the alignment light source 35a on the imaging device 31g and the diameter of the keratling image is within a predetermined range.

Here, the control unit 27 may obtain the amount of misalignment from the ratio and display the amount of misalignment on the display screen 29a. Note that the alignment in the front-rear direction may be performed by adjusting the position of the measurement head 16 so that the bright spot image Br is focused by the alignment light source 36a, which will be described later.

Further, the observation system 31 is provided with an alignment system 36 . The alignment system 36 has an alignment light source 36a and a projection lens 36b, and shares a half mirror 31c, a dichroic filter 31b and an objective lens 31a with the observation system 31.

The alignment system 36 projects the light beam from the alignment light source 36a onto the cornea Ec as a parallel light beam through the objective lens 31a. The control unit 27 or the examiner moves the measurement head 16 in the front-rear direction based on the bright spots (bright spot images) projected onto the cornea Ec, thereby moving the measuring head 16 in the direction perpendicular to the optical axis of the observation system 31. (Vertical direction, horizontal direction) alignment is performed.

At this time, the control unit 27 causes the display screen 29a to display an alignment mark AL, which serves as a guide for the alignment mark, in addition to the anterior segment image E′ formed with the bright spot image Br. The control unit 27 may be configured to perform control so as to start measurement when alignment is completed.

The visual target projection system 32 is an optical system that projects a visual target in order to fixate and cloud the eye E to be examined, and presents it on the fundus oculi Ef. The target projection system 32 includes a target optical section 32A (see FIG. 4, only the reflecting mirror 32j is shown in FIG. 3), an imaging lens 32b, a focusing lens 32c, a relay lens 32d, a beam splitter 32e, and a field lens. 32f, a variable cross cylinder (VCC) lens 32g, a mirror 32h and a dichroic filter 32i.

The target optical unit 32A, as shown in FIG. 4, has a fixed fixation target optical system 32B and a variable target optical system 32C. The fixed fixation target optical system 32B has a reflection mirror 32j, a relay lens 32k, a reflection mirror 32m, a beam splitter 32n, a fixed fixation target 32p, and a fixed fixation target light source 32s. The variable target optical system 32C has a display (display unit) 32r, and shares a reflecting mirror 32j, a relay lens 32k, a reflecting mirror 32m, and a beam splitter 32n with the fixed fixation target optical system 32B.

The fixed fixation target 32p is a target to be presented to the subject for fixation, and is a pattern having a visual angle greater than a certain value that allows the subject's eye E to clearly recognize the out-of-focus (degree of blurring) (Fig. 9). In the present embodiment, the fixed fixation target 32p is a landscape target that includes a portion that is easy to gaze at and that allows natural distant vision (see FIG. 9). Such a fixed fixation target 32p can be constructed by printing or baking a high-definition pattern as shown in FIG. 9 on the surface of a flat glass.

As shown in FIG. 5, the fixed fixation target light source 32q includes a fixed fixation target light source 32s, a fusion frame light source 32t, and a glare light source 32u, all of which are white point light sources such as LEDs. The fixed fixation target light source 32s is arranged at the vertex of a conical reflecting plate 32v whose inner surface is mirror-finished. A fusion frame 32x arranged in a ring shape on the outer peripheral portion of the fixed fixation target 32p and arranged on the bottom surface of the reflecting tube 32w emits light from the rear side. A plurality of glare light sources 32u for irradiating the subject's eye E with glare light are provided at predetermined intervals along the circumferential direction of the reflecting tube 32w.

The combination of the fixed fixation target light source 32q, that is, the combination of the fixed fixation target light source 32s, the fusion frame light source 32t, and the glare light source 32u is not limited to the present embodiment, and at least one of the light sources is If provided, there is no particular limitation on the combination.

The display 32r displays a landscape chart for visual fixation and cloudiness when performing an objective test and a subjective test, as well as an optometric chart such as a Landolt's ring and an E letter chart, and a cross-cylinder (CC) chart to be described later. A plurality of optotypes or the like for identifying an image (optical target image for astigmatism test) are displayed. This display 32r can be formed by an EL (electroluminescence) or a liquid crystal display (LCD), and displays an arbitrary image under the control of the control section 27. FIG. The display 32r is movably provided along the optical axis at a position conjugate with the fundus Ef of the eye E to be examined on the optical path of the target projection system 32 (subjective examination system 34).

The focusing lens 32c is driven forward and backward along the optical axis by a drive motor (not shown). By moving the focusing lens 32c toward the subject's eye E, the refractive power can be displaced to the negative side. can be displaced to the side. Therefore, by advancing and retracting the focusing lens 32c, the presenting distance of the visual target displayed on the fixed fixation target 32p or the display 32r can be changed, that is, the presenting position of the visual target image can be changed. It can be fixed and cloudy.

The VCC lens 32g has positive and negative refractive powers, and is composed of a cylindrical lens having a convex curved surface and a cylindrical lens having a concave curved surface. The two cylinder lenses are independently rotated around the optical axis by a driving mechanism such as a pulse motor (not shown). The amount of astigmatism can be adjusted by relatively rotating the two cylinder lenses, and the astigmatism axis angle can be adjusted by integrally rotating the two cylinder lenses. Therefore, the VCC lens 32g acts to cancel the astigmatism of the eye E to be examined. The VCC lens 32g can generate, for example, an astigmatism amount of 0 to 8D on the subject's eye E, and is arranged at a position substantially conjugate with the pupil of the subject's eye E via the objective lens 31a.

The subjective examination system 34 is an optical system that presents a CC target image to the fundus. The subjective inspection system 34 includes an LED 34a, a diffuser plate 34b, a CC optotype plate (astigmatism test target) 34c, an imaging lens 34d, and a cross cylinder (CC) lens with a prism as a beam splitting member (beam splitting member) 34e. , a mirror 34f and a relay lens 34g.

The CC optotype plate 34c is a glass substrate on which a dot cloud-like dot optotype pattern 40 for CC inspection (astigmatism test optotype: see FIG. 6) is drawn. White light is emitted from the LED 34a, passes through the CC optotype plate 34c, and a CC optotype image is presented to the eye E to be examined. A diffusion plate 34b is arranged adjacent to the CC optotype plate 34c. The diffuser plate 34b reduces illumination unevenness of the white light passing through the CC optotype plate 34c.

The LED 34a, diffusion plate 34b, and CC optotype plate 34c are integrally driven forward and backward as a CC optotype unit along the optical axis by a drive motor (not shown). By advancing and retreating the LEDs 34a, the diffusion plate 34b, and the CC optotype plate 34c, it is possible to change the presentation distance of the CC optotype image projected from the CC optotype plate 34c.

Alternatively, the LED 34a, diffusion plate 34b, and CC optotype plate 34c may be fixed, a focusing lens may be added, and this focusing lens may be moved back and forth along the optical axis. Also, instead of the LEDs 34a, diffusion plate 34b, and CC target plate 34c, a display 32r may be used as in the target optical unit 32A.

The prism-equipped CC lens 34e is formed by integrating a prism and a cross-cylinder lens. The prism-equipped CC lens 34e has prisms 34h and 34i in which a cylinder lens of ±0.5D, for example, is orthogonal to the optical axis and the generatrix is inclined at 45° with respect to the optical axis (see FIG. 6). Also, the CC lens 34e with a prism is substantially conjugate with the VCC lens 32g with respect to the relay lens 34g, that is, at a position substantially conjugate with the pupil of the eye E to be examined.

A ring gear 34j, for example, is formed around the prism-equipped CC lens 34e. The ring gear 34j meshes with a drive gear 34k formed on the output shaft of the drive motor, and the prism-equipped CC lens 34e is rotated via the drive motor. As the drive motor, a motor capable of detecting a rotation angle or a motor that rotates according to a drive input value, such as a pulse motor 34m, is used.

FIG. 6 shows an example of action of the prism-equipped CC lens 34e. As shown in FIG. 6, when the luminous flux of the dot optotype pattern 40 from the CC optotype plate 34c is incident on the CC lens 34e with a prism, this luminous flux is split into a luminous flux transmitted through the prism 34h and a luminous flux transmitted through the prism 34i. be. The split luminous flux is presented to the subject's eye E in a separated state as two CC target images 40a and 40b having axial angles different from each other by 90°. Therefore, an example of action of the prism-equipped CC lens 34e is shown. As shown in FIG. 6, by providing the prism-equipped CC lens 34e, two CC target images 40a and 40b having axial angles different from each other by 90° can be simultaneously observed.

The eye refractive power measurement system 33 includes a ring-shaped light flux projection system 33A that projects a ring-shaped measurement pattern onto the fundus Ef of the eye to be examined E, and a ring that detects (receives) the reflected light of the ring-shaped measurement pattern from the fundus Ef. It has a shaped beam receiving system 33B.

The ring-shaped beam projection system 33A has a reflector light source unit 33a, a relay lens 33b, a pupil ring diaphragm 33c, a field lens 33d, a perforated prism 33e, and a rotary prism 33f. The dichroic filter 31b and the objective lens 31a are shared with the observation system 31. The reflector light source unit 33a has, for example, a reflector measurement light source 33g for reflector measurement using an LED, a collimator lens 33h, a conical prism 33i, and a ring pattern forming plate 33j. It is integrally movable along the optical axis of the measurement system 33 .

The ring-shaped light receiving system 33B has a hole portion 33p of a holed prism 33e, a field lens 33q, a reflecting mirror 33r, a relay lens 33s, a focusing lens 33t, and a reflecting mirror 33u. A filter 31e, an imaging lens 31f, and an imaging device 31g are shared with the observation system 31, a dichroic filter 32i is shared with the visual target projection system 32 (subjective examination system 34), and a rotary prism 33f and a perforated prism 33e are ring-shaped. It is shared with the beam projection system 33A.

Next, the operation in the eye refractive power measurement mode will be described. The controller 27 turns on the reflector measurement light source 33g and moves the reflector light source unit 33a of the ring-shaped beam projection system 33A and the focusing lens 33t of the ring-shaped beam receiving system 33B in the optical axis direction. In the ring-shaped luminous flux projection system 33A, the reflector light source unit 33a emits a ring-shaped measurement pattern, and the measurement pattern advances to the perforated prism 33e through the relay lens 33b, the pupil ring diaphragm 33c, and the field lens 33d. The light is reflected by the reflecting surface 33v and led to the dichroic filter 32i through the rotary prism 33f. The ring-shaped light beam projection system 33A projects the ring-shaped measurement pattern onto the fundus Ef of the subject's eye E by guiding the measurement pattern to the objective lens 31a through the dichroic filters 32i and 31b.

In the ring-shaped light receiving system 33B, the ring-shaped measurement pattern formed on the fundus oculi Ef is condensed by the objective lens 31a, passed through the dichroic filter 31b, the dichroic filter 32i, and the rotary prism 33f to the hole 33p of the perforated prism 33e. proceed. In the ring-shaped light receiving system 33B, the measurement pattern passes through a field lens 33q, a reflecting mirror 33r, a relay lens 33s, a focusing lens 33t, a reflecting mirror 33u, a dichroic filter 31e, and an imaging lens 31f, and is transferred to an image sensor 31g. form an image. As a result, the imaging element 31g detects an image of the ring-shaped measurement pattern, and the control unit 27 displays the image of the measurement pattern on the display screen 29a. Based on the image signal from the image (imaging element 31g), Spherical power, cylindrical power, and axial angle as eye refractive power are measured by well-known methods.

In the eye refractive power measurement mode, the control unit 27 lights the fixed fixation target light source 32q in the target projection system 32 to display the fixed fixation target 32p (see FIG. 8), and displays the image on the display 32r, which will be described later. to display a variable optotype. A light flux from the fixed fixation target 32p and the display 32r passes through a beam splitter 32n, a reflecting mirror 32m, a relay lens 32k, a reflecting mirror 32j, an imaging lens 32b, a focusing lens 32c, a relay lens 32d, a beam splitter 32e, and a field lens 32f. , a VCC lens 32g, a mirror 32h, a dichroic filter 32i, a dichroic filter 31b, and an objective lens 31a. The examiner or the control unit 27 performs alignment with the examinee fixating the presented fixed fixation target 32p or the like, and adjusts the distance of the eye to be examined E based on the results of the provisional measurement of the eye refractive power (ref). After moving the focusing lens 32c to the point, the eye refractive power is measured while the accommodation is in a cloudy state.

Next, the operation in the subjective inspection mode will be described. The control unit 27 integrally moves the CC optotype unit, that is, the LED 34a, the diffusion plate 34b, and the CC optotype plate 34c to a position suitable for the eye refractive power of the eye to be examined E measured in the eye refractive power measurement mode. The VCC lens 32g is set in a posture that corrects the astigmatic state of the eye E measured in the force measurement mode. Also, the prism-equipped CC lens 34e is rotated to match the axial angle of the astigmatism generated by the VCC lens 32g.

Next, the LED 34a is turned on, and a variable optotype to be described later is displayed on the display 32r. The white light emitted from the LED 34a passes through the CC optotype plate 34c, is split by the prism-equipped CC lens 34e, and is directed to the subject's eye E as the separated point group CC optotype images 40a and 40b (see FIG. 6). presented to.

At this time, as shown in FIG. 11(b), for example, the subject views CC visual target images 40a and 40b arranged in a predetermined positional relationship (in FIG. 11(b), arranged obliquely). can be confirmed. The angle of arrangement coincides with the rotation angle of the prism-equipped CC lens 34e, that is, the axial angle of the eye E to be examined. Note that the CC target images 40a and 40b are presented in a blurred state due to the influence of the prism-equipped CC lens 34e. By comparing the degree of blurring of the CC target images 40a and 40b and adjusting the relative angle of the VCC lens 32g so that the blurring of both images is approximately the same, it is possible to determine an accurate amount of astigmatism and an axis angle. .

The examiner asks which of the CC optotype images 40a and 40b can be clearly (clearly) seen, and the examinee determines which of the CC optotype images 40a and 40b can be clearly visually recognized. If the CC target images 40a and 40b are judged to be equally blurred (clear), the subject responds to that effect to complete the CC test. The subject's response may be voice, or may be a tiltable lever or the like provided in the subject controller 26, which will be described later.

In addition, when the clarity of the CC optotype images 40a and 40b is different, the examinee responds to the examiner with the clearly visible CC optotype images 40a and 40b. Based on the subject's response, the examiner changes the conditions and asks the subject again. That is, the VCC lens 32g is relatively rotated to adjust the amount of astigmatism and the axis angle of astigmatism. CC lens with prism 34e rotates to match the axial angle generated by VCC lens 32g. The above steps are then repeated until the subject responds that the CC optotype images 40a and 40b are comparable.

Through the above steps, the controller 27 can calculate the astigmatism amount and the astigmatism axis angle of the subject's eye E based on the relative rotation amount of the VCC lens 32g and the integrated rotation amount of the prism-equipped CC lens 34e. This completes the CC test for measuring the amount of astigmatism and astigmatism axis angle. After that, a red-green test, a binocular open test, etc. are performed, and the subjective test is completed.

In this subjective inspection mode, when performing a glare inspection (glare test), the glare light source 32u is turned on under the control of the control unit 27 to perform the subjective inspection.

The configurations of the eye refractive power measurement system 33, the subjective examination system 34, the alignment system 35, the alignment system 36, the keratometry system 37, etc., and the measurement principle of the eye refractive power (ref), subjective examination, and corneal shape (kerato), etc. is publicly known, and detailed description thereof will be omitted.

(Control system of optometric device)
The base 11 is provided with a control section 27 that controls each section of the optometric apparatus 10 (see FIG. 1). As shown in FIG. 8, the control unit 27 includes, in addition to the measuring optical system 21 described above, the vertical driving unit 22, the horizontal driving unit 23, and the rotating driving unit 24 as the driving mechanism 15, an examiner controller ( A first input unit) 25, a subject controller (second input unit) 26, a storage unit 28, and a display unit 29 are connected.

The examiner controller 25 is used by the examiner to operate the optometric apparatus 10 . The subject controller 26 is used by the subject to respond when acquiring various types of eye information about the subject's eye. Both the controller for examiner 25 and the controller for examinee 26 are provided with input devices such as a keyboard, a mouse, and a joystick. For example, this touch panel may also be included. The controller 27 is connected to the examiner controller 25 and the examinee controller 26 via wired or wireless communication paths, respectively.

The control unit 27 expands the program stored in the connected storage unit 28 or the built-in internal memory 27a, for example, on a RAM, and accordingly responds appropriately to the operation of the examinee controller 25 or the examinee controller 26. It controls the operation of the optometric apparatus 10 in an integrated manner. In this embodiment, the internal memory 27a is composed of a RAM or the like, and the storage section 28 is composed of a ROM, an EEPROM, or the like. The control unit 27 also includes a display control unit 27b that displays a variable optotype (variable optotype) on the display 32r.

The display unit 29 displays an anterior segment image E' based on an image signal output from an imaging device (CCD) 31g provided in the observation system 31, etc. on a display screen 29a (see FIG. 2).

As already described in detail, the measurement optical system 21 includes an observation system 31, a target projection system 32, an eye refractive power measurement system 33, a subjective examination system 34, an alignment system 35, an alignment system 36, and a keratometry system 37. have.

(An example of a fixation target of an optometric device)
10 and 11 are diagrams showing an example of a fixation target presented to the subject's eye E by the optometric apparatus 10 according to the present embodiment. The fixation targets shown in FIGS. 10 and 11 are the fixation target image formed by the fixed fixation target 32p of the target optical unit 32A of the target projection system 32 and the display 32r, and the CC target image of the subjective examination system 34. The fixation target images 40a and 40b are combined and projected onto the fundus Ef of the eye E to be examined.

First, FIG. 10(a) is an example of a fixation target using a fixed fixation target 32p of the target optical unit 32A of the target projection system 32 and a display 32r. In the fixation target shown in FIG. 10( a ), the control unit 27 turns on the fixed fixation target light source 32 s so that the fixed fixation target 32 p is positioned at infinity (that is, the center position) of the line of sight of the subject's eye. The sun 50 is displayed, and the road 51 extending from the lower position to the central position and the center line 52 moving from the central position to the lower position are displayed on the display 32r. A building 53 moving toward is displayed.

As a result, it is possible to display a fixation target as if the subject were moving (running) on the road 51 toward the sun located at infinity, and the line of sight of the subject can be set at infinity. You can help fix it.

Preferably, the control unit 27 provides a parallax corresponding to a predetermined distance so that each building 53 is displayed at a position corresponding to a position separated by a predetermined and different distance from the left eye EL (see FIG. 2). In this state, each building 53 is displayed on the display 32r of the left eye measurement optical system 21L, and similarly each building 53 is displayed at a position corresponding to a position separated by a predetermined and different distance from the right eye ER (see FIG. 2). Each building 53 is displayed on the display 32r of the measuring optical system 21R for the right eye with a parallax corresponding to a predetermined distance so that the building 53 is displayed. As a result, the buildings 53 displayed on the displays 32r of the left and right measurement optical systems 21R and L are stereoscopically viewed so that the building 53 near the central position appears at infinity and the building 53 near the left and right positions appears in front. Presented for optometry.

Next, FIG. 10B is also an example of a fixation target using the fixed fixation target 32p of the target optical unit 32A of the target projection system 32 and the display 32r. In the fixation target shown in FIG. 10(b), the control unit 27 turns on the fixed fixation target light source 32s so that the fixed fixation target 32p reaches the infinity position (that is, the central position) of the line of sight of the subject's eye. The sun 50 is displayed, the sea 54 and the ship 55 are displayed in the area from the center position to the bottom position, and the display 32r displays a guardrail 56 extending in the horizontal direction and moving from left to right in the drawing. ing.

As a result, it is possible to display the fixation target as if the subject were moving (running) from right to left on the road (not shown) in front of the guardrail 56 while looking at the sun positioned at infinity. It can help fix the subject's line of sight to infinity.

Preferably, the control unit 27 controls the left eye EL (see FIG. 2) with a parallax corresponding to a predetermined distance so that the guardrail 56 is displayed at a position corresponding to a predetermined distance away from the left eye EL (see FIG. 2). The guardrail 56 is displayed on the display 32r of the eye measurement optical system 21L, and similarly, the guardrail 56 is displayed at a position corresponding to a position separated by a predetermined and different distance from the right eye ER (see FIG. 2). , the guardrail 56 is displayed on the display 32r of the right-eye measurement optical system 21R in a state in which a parallax corresponding to a predetermined distance is provided.

As a result, the guard rails 56 displayed on the displays 32r of the left and right measuring optical systems 21R and L are stereoscopically presented to the subject's eye as if they were at positions separated by a predetermined distance.

Next, FIG. 10(c) is an example of a fixation target using a fixed fixation target 32p and a fusion frame 32x of the target optical unit 32A of the target projection system 32. FIG. In the fixation target shown in FIG. 10(c), the controller 27 turns on the fixed fixation target light source 32s to display a landscape chart (fixed fixation target 32p) as shown in FIG. , the fusion frame light source 32t is turned on to display the fusion frame 32x in the peripheral portion of the scenery chart. This makes it possible to strongly fuse the fixation targets presented to the left and right eyes to be examined.

Next, FIG. 10D shows an example of a fixation target using a fixed fixation target 32p of the target optical unit 32A of the target projection system 32 and a glare light source 32u. In the fixation target shown in FIG. 10(d), the controller 27 turns on the fixed fixation target light source 32s to display a landscape chart (fixed fixation target 32p) as shown in FIG. , the glare light source 32u is turned on. This makes it possible to perform a glare test (glare inspection) while fixing the line of sight of the subject's eye.

Next, FIG. 11A shows an example of a fixation target using the display 32r of the target optical unit 32A of the target projection system 32 and the fusion frame 32x. In the fixation target shown in FIG. 11A, the control unit 27 causes the display 32r to display the astigmatism chart 57 and the pointer 58, and illuminates the fusion frame light source 32t, so that the periphery of the astigmatism chart 57 , a fusion frame 32x is displayed.

Since the astigmatism chart 57 is displayed on the display 32r, the astigmatism chart 57 can be arbitrarily rotated and the display shape of the astigmatism chart 57 can be arbitrarily changed. Further, the display position of the pointer 58 can be set to any position using the examiner's controller 25 , thereby instructing the subject to gaze at the astigmatism chart 57 .

FIG. 11(b) is an example of a fixation target using the CC target images 40a and 40b of the subjective examination system 34, the display 32r of the target optical unit 32A, and the fusion frame 32x. In the fixation target shown in FIG. 11(b), the controller 27 turns on the LED 34a to split the luminous flux from the CC optotype plate 34c by the prism-equipped CC lens 34e, resulting in the separated point group-like CC vision. The target images 40a and 40b can be presented to the eye E to be examined. The display 32r also displays identification targets 59a and 59b such as numbers and a pointer 58 in the vicinity of these CC target images 40a and 40b. Furthermore, by turning on the fusion frame light source 32t, a fusion frame 32x is displayed on the periphery of the CC visual target images 40a and 40b.

Since the identification targets 59a and 59b do not pass through the prism-equipped CC lens 34e, they both have the same "appearance". Also, one or both of the CC target images 40a and 40b are similarly blurred under the influence of the prism-equipped CC lens 34e. Therefore, the subject's eye E focuses on the discriminating optotypes 59a and 59b and adjusts them, or focuses on the discriminating optotypes 59a and 59b instead of the CC optotype images 40a and 40b, and "both are clearly visible". It is possible to avoid problems such as misidentification as

Therefore, regardless of the arrangement of the CC optotype images 40a and 40b, the examinee only needs to answer the identifying optotypes 59a and 59b located near the CC optotype images 40a and 40b that are clearly visually recognized. As a result, the burden on the subject can be reduced, and the subject's wrong answers can be suppressed, the measurement time can be shortened, and the workability can be improved. Further, the display position of the pointer 58 can be arbitrarily set by using the examiner controller 25 and the examinee controller 26, so that the examinee can see the CC optotype images 40a and 40b. By instructing one of them, the examinee can confirm how it looks.

The control unit 27 can change the presenting positions of the identification targets 59a and 59b displayed on the display 32r based on the change in the rotation angle of the CC lens 34e with prism. That is, the presenting positions of the identification targets 59a and 59b displayed on the display 32r can be changed by following the change in the presenting positions of the CC optotype images 40a and 40b with respect to the eye E to be examined.

Note that the identification targets 59a and 59b are not limited to numbers as shown in FIG. In addition, Kanji characters such as left, right, up and down may be used as the identification markers 59a and 59b. Further, the identification targets 59a and 59b may be, for example, red and green circles, and the CC target images 40a and 40b may be surrounded by these circles.

The form of the identification target 59a, 59b is not limited to the pattern described above, and any pattern may be used as long as the CC target image 40a, 40b can be identified. For example, the discrimination optotypes 59a and 59b may be Chinese numerals or Roman numerals, or figures having different shapes may surround the CC optotype images 40a and 40b, respectively. Furthermore, it goes without saying that the identification targets 59a and 59b may be symbols such as arrows having different shapes.

An example of the fixation target presented to the eye to be examined E by the optometric apparatus 10 according to the present embodiment has been described above with reference to FIGS. Possible fixation targets are not limited to the illustrated examples.

As an example, the control unit 27 displays icons indicating various messages on the display 32r, such as icons indicating messages such as "Please look here" and "Which one can you see better?" An answer may be requested from the subject by displaying near at least one of the images 40a and 40b.

For example, in the example shown in FIG. 11(b), the display 32r displays a pointer 58 that moves in conjunction with the mouse of the subject controller 26 and an icon (not shown) displaying, for example, "no change". . The subject moves the pointer 58 onto the clearly visible CC target images 40a and 40b and clicks on them. Alternatively, if the CC visual target images 40a and 40b look the same, move the pointer 58 onto the icon and click.

Alternatively, an input pad may be connected to the subject controller 26 to display a pointer 58 that moves in conjunction with the input position of the input pad and an icon indicating "no change". The subject moves the pointer 58 over the clearly visible CC target images 40a and 40b and circles them. Alternatively, if the CC visual target images 40a and 40b look the same, the icon is circled or touched.

A coordinate position detection unit provided in the control unit 27 automatically performs various processes such as changing the conditions, ending the CC test, etc. based on the position of the pointer 58 on the display 32r when an input signal is generated by clicking or the like. preferably implemented.

Further, in the fixed fixation target 32p as shown in FIG. 9, when the roof of the house at the infinite distance position (central position) of the line of sight of the subject is displayed in red, for example, the display 32r shows the roof of the house. By displaying the roof-shaped target in a color different from red at the position, the color of the roof of the fixation target presented to the subject can be changed. Alternatively, the brightness of the roof can be increased by displaying a red roof-shaped target at the position of the roof on the display 32r, and by blinking this target, the roof can be displayed blinking. As described above, according to the optometric apparatus 10 of the present embodiment, it is possible to change the color of the landscape chart of the fixed fixation target 32p, adjust the brightness, and the like.
(Another example of a fixation target of an optometric device)

FIG. 13 is a diagram showing another example of a fixation target presented to the subject's eye E by the optometric apparatus 10 according to the present embodiment. The fixation target shown in FIG. 12 is formed on the fundus Ef of the subject's eye E by combining the fixed fixation target 32p of the target optical unit 32A of the target projection system 32 and the variable target of the display 32r. It is projected.

More specifically, FIG. 13(a) shows that the fixation target image formed by the fixed fixation target 32p of the left eye measurement optical system 21L and the variable target of the display 32r is combined and projected onto the fundus Ef of the eye E to be examined. FIG. 13(b) shows that the fixation target image formed by the fixed fixation target 32p of the right eye measurement optical system 21R and the variable target of the display 32r is combined and projected onto the fundus Ef of the eye E to be examined. It is a thing.

In the example shown in FIG. 13, the fixed fixation target 32p has a plurality of visual targets (for example, a book for an inspection distance of 30 cm and an ocean for an infinite distance) corresponding to several inspection distances (for example, 30 cm to infinity). is what is displayed. Then, the optometric apparatus 10 according to the present embodiment performs an operation of fixing the line of sight of the subject to the specified examination distance.

For example, when the examiner operates the examiner controller 25 to designate the examination distance L, the controller 27 controls the interpupillary distance PD of the examinee and the examination distance PD as shown in FIG. of the left eye measurement optical system 21L and the right eye measurement optical system 21R. Here, the interpupillary distance PD may be a standard distance, or the distance between the pupil center (center of gravity) position of the left eye to be examined EL and the pupil center (center of gravity) position of the right eye to be examined ER is measured. It may be obtained. The standard distance may be the distance defined by the eye model. Examples of eye models include the Gullstrand eye model. The inspection distance may be specified by the control unit 27 according to a predetermined inspection sequence, or may be specified by the subject by operating the subject controller 310 .

Assuming that hPD is half the interpupillary distance PD, the angle of rotation θ can be obtained by equation (1).

The control unit 27 rotates the left-eye measurement optical system 21L and the right-eye measurement optical system 21R in opposite directions about the eyeball rotation point by the rotation angle θ obtained by Equation (1). As a result, the subject's eye can be converged (or diverged), and the subject's line of sight can be fixated at the position of the inspection distance L.

Also, in the example shown in FIG. 13, a pair of variable visual targets 60R and 60L are displayed on the display 32r superimposed on the fixed fixation target 32p. When the above examination distance L is specified, the control unit 27 causes the displays 32r of the left eye measurement optical system 21L and the right eye measurement optical system 21R to simultaneously display the pair of variable targets 60R and 60L, respectively. The variable targets 60R and 60L are presented such that the left eye EL and the right eye ER gaze at the monitor M, respectively. A pair of variable optotypes 60R and 60L are provided with a parallax according to the examination distance L and presented to the subject's eye.

The control unit 27 controls the displays 32r of the right eye measuring optical system 21R and the left eye measuring optical system 21L so as to present the variable targets 60R and 60L in the vicinity of the position corresponding to the examination distance L. At this time, the control unit 27 can control the display 32r so as to change the form (for example, shape, size, orientation, etc.) of at least part of the variable targets 60R and 60L. For example, the control unit 27 controls the display 32r so that the wing portions of the variable visual targets 60R and 60L move up and down. This makes it easier for the subject to recognize the positions of the variable optotypes 60R and 60L, and makes it easier for the right eye ER and the left eye EL to be examined to fixate on the variable optotype 60L.

In addition, the control unit 27 can blur the fixed fixation target 32p according to the presentation positions of the variable targets 60R and 60L. The control unit 27 causes the display 32r of the right-eye measuring optical system 21R and the left-eye measuring optical system 21L to display an image only subjected to the blurring process. For example, the control unit 27 performs blurring processing on a region in which visual targets corresponding to other inspection distances separated by a predetermined distance from the presentation positions of the variable visual targets 60R and 60L are drawn. Further, the control unit 27 enlarges only the vicinity of the positions of the variable optotypes 60R and 60L (only the image corresponding to the predetermined examination distance including the positions of the variable optotypes 60R and 60L) to enlarge the right eye ER and the left eye to be examined. It may be presented to the subject's eye EL.
(Effect of optometric device)

In the optometric apparatus 10 of the present embodiment configured as described above, the optotype presenting optical system is an optotype projection system ( A fixation target optical system 32 and this target projection system 32 have a common optical axis, and a CC target plate (a target for astigmatism test) 34c is generated with a predetermined amount of astigmatism to produce a pair of CC targets. and a subjective examination system (cross-cylinder optical system) 34 for presenting images (target images for astigmatism test) 40a and 40b to the eye to be examined, and a target projection system 32 projects a fixed fixation target 32p to the eye to be examined. A fixed fixation target optical system 32B to be presented, and a variable target optical system that shares an optical axis with this fixed fixation target optical system 32B and presents a variable variable target displayed by a display unit 29 to the subject's eye. 32C, and the control unit 27 has a display control unit 27b that causes the display unit 29 to display the variable optotype.

Therefore, the fixation target presented to the subject's eye by the fixed fixation target optical system 32B and the variable target optical system 32C, and the CC target images 40a and 40b presented to the subject's eye by the subjective examination system 34 are diversified. As a result, it is possible to reliably perform fixation of the line of sight on the fixation target, and to reliably perform projection of the cross cylinder.

Here, since the fixed fixation target 32p and the variable target are configured to form an integral figure when presented to the subject's eye, fixation of the line of sight to the fixation target can be performed more reliably. can let

In addition, since the fixed fixation target 32p and the variable target are presented to the subject's eye so as to overlap at least their central portions, it is possible to more reliably fix the line of sight to the fixation target.

Furthermore, since the display control unit 27b causes the display unit 29 to display a continuously changing variable target, the fixation target presented to the subject's eye by the fixed fixation target optical system 32B and the variable target optical system 32C is displayed. It can be made more diversified, and the fixation of the line of sight to the fixation target can be performed more reliably.

In addition, the fixed fixation target optical system 32B includes a fixed fixation target light source 32s that illuminates the fixed fixation target 32p, and a fusion frame that illuminates a fusion frame 32x provided on the periphery of the fixed fixation target 32p. and a glare light source 32u provided in the periphery of the fixed fixation target 32p. can be further diversified, and the fixation of the line of sight to the fixation target can be performed more reliably.

Further, the subjective inspection system 34 separates a CC lens (light beam splitting member) 34e with a prism that splits the light beam projected onto the CC optotype plate 34c into a pair of light beams having different axial angles, and the pair of CC optotype plates 34c. Since it has a VCC lens (target projection unit) 32g for projecting CC target images (target images for astigmatism test) 40a and 40b to the subject's eye in this state, cross cylinder projection can be performed reliably.

Further, an examiner controller (first input unit) 25 for accepting input of an examination instruction is provided, and the display control unit 27b displays the variable optotype including the examination instruction accepted by the examiner controller 25 on the display unit 29. Since the information is displayed, the burden on the subject can be reduced, and erroneous answers by the subject can be suppressed, the measurement time can be shortened, and workability can be improved.

It has a subject controller (second input unit) 26 that accepts a coordinate instruction on the variable optotype corresponding to the input of the examination instruction, and the control unit 27 controls the coordinate position of the coordinate instruction on the variable optotype. , the burden on the subject can be reduced, the subject's wrong answers can be suppressed, the measurement time can be shortened, and the workability can be improved.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments and examples, and design modifications that do not deviate from the gist of the present invention are possible. are included in the present invention.

As an example, the fixation targets shown in FIGS. 9 to 11 and 13 are merely examples, and the fixation targets that can be presented to the subject's eye by the optometry apparatus of the present invention are not limited to those shown in these figures.

E Eye to be examined 10 Optometry device 21 Measurement optical system 25 Controller for examiner (first input unit)
26 Subject controller (second input unit)
27 control unit 27b display control unit 32 target projection system (target presentation optical system)
32B fixed fixation target optical system 32C variable target optical system 32g VCC lens (target projection unit)
32p Fixed fixation target 32r Display (display unit)
32s Light source for fixed fixation target 32t Light source for fusion frame 32u Light source for glare 34 Subjective inspection system (cross cylinder optical system)
34c CC optotype plate (optical target for astigmatism test)
34e CC lens with prism (beam splitting member)
40a, 40b optotype image (optical target image for astigmatism test)

Claims (7)

In an optometry apparatus comprising an optotype presenting optical system and a control unit,
The target presenting optical system shares an optical axis with a fixation target optical system for presenting a fixation target to the eye to be inspected for causing fixation of the line of sight of the eye to be inspected, a cross-cylinder optical system for generating a predetermined amount of astigmatism with respect to an astigmatism test target and presenting a pair of astigmatism test target images to the subject's eye;
The fixation target optical system includes a fixed fixation target optical system for presenting a fixed fixation target to the eye to be examined, and a variable optical system that shares an optical axis with the fixed fixation target optical system and is displayed by a display unit. a variable target optical system for presenting a variable target to the eye to be examined;
The control unit has a display control unit that causes the display unit to display the variable optotype,
The cross-cylinder optical system includes a beam dividing member that divides a beam for projecting the astigmatism test target into a pair of beams having different axis angles, and a beam splitting member that divides the beam for projecting the astigmatism test target into a pair of beams having different axial angles, a target projection unit that adjusts an astigmatism axis angle while projecting a target image onto the eye to be inspected,
The fixation target optical system and the cross cylinder optical system are merged to share an optical axis,
The beam splitting member is provided at a position before joining the fixation target optical system in the cross cylinder optical system,
The target projection unit is provided at a position after joining the fixation target optical system in the cross cylinder optical system, and is shared by the fixation target optical system and the cross cylinder optical system ,
The fixed fixation target optical system has a fixation target light source arranged at the vertex of a conical reflecting plate having a mirror-finished inner surface to illuminate the fixed fixation target. Device. 2. The optometry apparatus according to claim 1, wherein said fixed fixation target and said variable target are configured to form an integral figure when presented to said eye to be examined. 3. The optometry apparatus according to claim 2, wherein the fixed fixation target and the variable target are presented to the eye to be examined while overlapping at least central portions thereof. The optometry apparatus according to any one of claims 1 to 3, wherein the display control unit causes the display unit to display the continuously changing variable target. The fixed fixation target optical system includes a fusion frame light source for illuminating a fusion frame provided at the periphery of the fixed fixation target, and/or a glare provided at the periphery of the fixed fixation target. 5. The optometry apparatus according to claim 1, further comprising a light source. Having a first input unit for receiving an input of an inspection instruction,
The optometry apparatus according to any one of claims 1 to 5, wherein the display control unit causes the display unit to display the variable optotype including the examination instruction received by the first input unit. a second input unit that accepts a coordinate instruction on the variable optotype corresponding to the input of the examination instruction;
7. The optometry apparatus according to claim 6, wherein the control unit has a coordinate position detection unit that detects a coordinate position of the coordinate indication on the variable target.

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