JP2023026672A - Visual inspection apparatus and visual inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a visual inspection device in which a burden on a subject is reduced when performing a visual inspection like visual field, visual acuity, and visual recognition.

SOLUTION: A visual inspection device comprises: a laser irradiation unit; a sight line direction detection unit; a projection control unit which generates a projection image to be projected with laser light on a retina of a subject and generates an image for inspection in a grating at any position out of the plurality of gratings on the projection image to project the image for inspection onto any position of the retina of the subject; a storage unit which stores position information of each grating in association with information of the sight line direction being standard and reference when the subject visually recognizes the position expressed by the position information; and an inspection processing unit which performs inspection processing of the eccentric vision by projecting the image for inspection in a direction deviating from the sight line direction of the subject on the basis of the position information of each grating of the image for inspection on the projection image, the position information associated with the position information on the retina of the subject and with which the image for inspection is projected and the sight line direction information detected by the sight line direction detection unit.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to a visual inspection device and a visual inspection method.

Conventionally, a gaze point is presented in a housing that covers the subject's field of view, and with the subject's gaze directed toward the gaze point, a bright point (target) is randomly displayed in the subject's field of view. A visual field test device is known that tests whether or not a subject can visually recognize.

Also, in recent years, there has been known a visual field testing apparatus using a retinal scanning technique for projecting a test image on the retina of a subject by irradiating the retina with a laser beam.

JP 2009-142313 A

With conventional visual field testing devices, the subject's burden is heavy because it is necessary to keep the line of sight directed to the gaze point during testing. In particular, it is difficult for children to keep looking at one point because they easily get tired of looking at one point. In addition, it is not easy for the elderly to keep looking at the gaze point because of the heavy physical burden. This is not only a visual field test, but also a test of visual acuity (particularly peripheral vision) and a test of whether or not the subject is visually recognized.

Therefore, it is an object of the present invention to provide a visual inspection apparatus and a visual inspection method that reduce the burden on a subject when performing a visual inspection such as visual field, visual acuity, and visual recognition.

A visual inspection apparatus according to an embodiment of the present invention includes a laser irradiation unit having a light source for generating laser light, a scanning mirror for scanning the laser light, a line-of-sight direction detection unit for detecting a line-of-sight direction of a subject, and By generating a projection image to be projected onto the retina of a subject by the laser beam and generating an inspection image on a grid at an arbitrary position among a plurality of grids on the projection image, an arbitrary image of the retina of the subject is generated. and a storage unit for storing inspection image data representing the inspection image. A storage unit that stores information on a standard and reference line of sight direction when a person visually recognizes the information in association with each other, position information of each grid of the inspection image on the projection image, and the retina of the subject. A direction deviating from the line-of-sight direction of the subject based on the position information on which the inspection image is projected and the line-of-sight direction information detected by the line-of-sight direction detection unit. and an inspection processing unit that performs inspection processing for out-of-center visual acuity by projecting the inspection image on the.

It is possible to provide a vision inspection apparatus and a vision inspection method that reduce the burden on a subject when performing a visual inspection such as visual field, visual acuity, and visual recognition.

1 is a diagram showing a visual inspection device 100 according to an embodiment; FIG. 1 is a block diagram showing the configuration of a visual inspection device 100; FIG. 3 is a diagram showing a laser irradiation unit 110; FIG. 3 is a diagram showing the configuration of a control unit 130; FIG. FIG. 3 is a diagram showing a projection image 10 including data of an inspection image 50 and an inspection image projected onto a retina 22; 5 is a diagram showing an inspection image 50; FIG. 5 is a diagram showing an inspection image 50; FIG. 4 is a diagram showing a flowchart representing processing executed by a control unit 130. FIG. FIG. 10 is a diagram showing a modified example of the inspection image 50;

Embodiments to which the visual inspection apparatus and visual inspection method of the present invention are applied will be described below.

<Embodiment>
FIG. 1 is a diagram showing a visual inspection device 100 according to an embodiment. The visual inspection apparatus 100 has a frame 102, adjusting members 103 and 104, a base 105, supporting sections 106a and 106b, image projecting sections 107a and 107b, a base 108, and imaging sections 180a and 180b.

In the visual inspection apparatus 100 , a pedestal 108 is provided on the base 105 , and both ends of the frame 102 are fixed to the upper surface of the base 105 .

The image projection units 107a and 107b are supported by support units 106a and 106b, and have therein a laser irradiation unit and a projection control unit, which will be described later. The image projection units 107a and 107b irradiate the left and right eyes of a subject whose vision such as visual field, visual acuity, and visual recognition is to be inspected with laser light by their respective laser irradiation units, and an image for inspection is projected onto the retina of the subject. Project a projection image containing

The imaging units 180a and 180b are cameras that capture images of the subject's right eye and left eye, respectively, in order to detect the movement of the subject's eye during examination.

In the following description, when the image projection unit 107a and the image projection unit 107b are not distinguished, they are referred to as the image projection unit 107. When the support units 106a and 106b are not distinguished, they are referred to as the support unit 106, and the imaging unit 180a. , 180b are referred to as an imaging unit 180 when they are not distinguished from each other.

The adjustment member 103 moves the support section 106 supporting the image projection section 107 in the Y-axis direction shown in the drawing. The adjustment member 104 moves the image projection section 107 along the support section 106 in the Z-axis direction.

The visual inspection apparatus 100 brings the subject's chin and forehead into contact with the pedestal 108 and the frame 102, respectively, and adjusts the image projection unit 107 so that the subject looks into the image projection unit 107 by the adjustment members 103 and 104. The examination is performed with the 107 brought close to the eyeball.

The hardware configuration of the visual inspection apparatus 100 will be described below with reference to FIG. FIG. 2 is a block diagram showing the configuration of the visual inspection device 100. As shown in FIG.

The visual inspection apparatus 100 includes a laser irradiation section 110 , a communication section 120 , a control section 130 , a storage section 140 , a laser output control section 150 and an imaging section 180 .

Among them, the control unit 130 , the storage unit 140 and the laser output control unit 150 are included in the control device 101 . The control device 101 is realized by an information processing device such as a computer including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), an internal bus, and the like. The control unit 130 and the laser output control unit 150 represent functions of programs executed by the control device 101 as functional blocks. The storage unit 140 functionally represents the memory of the control device 101 .

The laser irradiation unit 110 irradiates the subject's retina with laser light based on the projection image data including the test image data stored in the storage unit 140 with a preset light amount. That is, the laser irradiation unit 110 is an ocular unit for the subject, and by placing the eye on the laser irradiation unit 110 (looking into the laser irradiation unit 110), the subject receives an inspection image projected on the retina and the like in the brain. It is possible to perform visual inspection such as inspection of visual field, visual acuity, etc., and inspection of whether or not an inspection image or the like is visually recognized.

The visual field test is a test to check the visible range, and the visual acuity test is a test to check central vision or out-of-center vision (peripheral vision). Visual recognition means capturing (seeing) an image with the retina and recognizing it with the brain. Since the visual inspection apparatus 100 performs a visual inspection by projecting a projection image in which the inspection image moves on the retina by the laser irradiation unit 110, the visual inspection performed using the visual inspection apparatus 100 means that the moving inspection image is projected on the retina. It is a test to check whether or not the retina perceives (sees) and follows, and the brain perceives.

The communication unit 120 is a communication device for communicating between the visual inspection device 100 and an external device. Specifically, for example, the communication unit 120 may communicate with a terminal or the like provided in a medical institution via a network or the like, or may communicate with a device connected to the visual inspection apparatus 100 by wire or the like. may It should be noted that the method of communication by the communication unit 120 may be any method as long as the visual inspection apparatus 100 and an external device can communicate with each other.

The control unit 130 controls the entire operation of the visual inspection device 100 . The storage unit 140 stores programs executed by the control unit 130, various values obtained by calculation, and the like. The storage unit 140 also stores inspection image data representing inspection images used for visual inspection.

The laser output control unit 150 causes the laser irradiation unit 110 to irradiate the laser light based on the inspection image data stored in the storage unit 140 with the set light amount.

The imaging unit 180 is a camera arranged near the laser irradiation unit 110 . The movement of the subject's eyeball 20 and the direction of the subject's pupil are detected from the image data captured by the imaging unit 180 . Therefore, in other words, the imaging unit 180 functions as a pupil position detection unit that detects the position of the pupil 25 of the subject. The imaging unit 180 can also be said to be a line-of-sight direction detection unit for detecting the line-of-sight direction of the subject.

When the visual inspection is started, the imaging unit 180 takes an image of the subject and transfers the image data to the control unit 130 .

Although not shown, the visual inspection device 100 may have an output unit (display) for outputting various information. Further, the display may display an input screen or the like for inputting the result of the visual acuity test by the subject P based on the test image. Also, the output unit may be for writing information indicating the test results stored in the storage unit 140 onto a recording medium or the like.

Next, the laser irradiation unit 110 will be described with reference to FIG. 3 . FIG. 3 is a diagram showing the laser irradiation unit 110. As shown in FIG.

The laser irradiation unit 110 uses Maxwell's vision to irradiate the retina 22 of the subject's eyeball 20 with laser light.

The laser irradiation section 110 has a light source 111 , an adjustment section 112 and an optical system 113 . The optical system 113 has a scanning unit 114 , a plane mirror 115 and lenses 116 and 117 . The scanning unit 114 is, for example, a two-axis MEMS (Micro Electro Mechanical Systems) mirror.

In the laser irradiation unit 110 , the numerical aperture (NA) and/or beam diameter of the laser light L emitted by the light source 111 is adjusted in the adjustment unit 112 . The laser light L is visible laser light of red laser light, green laser light, and blue laser light.

The laser light L is reflected by the plane mirror 115 and scanned two-dimensionally by the scanning unit 114 . The scanned laser light L irradiates the subject's eyeball 20 through the lens 116 and the lens 117 . The laser light L converges in the vicinity of the lens 21 , passes through the vitreous body 23 and irradiates the retina 22 . An image is thereby projected onto the retina 22 . The scanning unit 114 vibrates at a relatively high frequency such as 28 kHz at which 60 frames of images are projected per second.

Next, functions of the control unit 130 will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is a diagram showing the configuration of the control unit 130. As shown in FIG. FIG. 5 is a diagram showing the projection image 10 including the data of the inspection image 50 and the inspection image projected onto the retina 22. As shown in FIG.

The control unit 130 has an imaging control unit 131 , a projection control unit 132 , a line-of-sight direction detection unit 133 and an inspection processing unit 134 . The imaging control unit 131, the projection control unit 132, the line-of-sight direction detection unit 133, and the inspection processing unit 134 represent functions of programs executed by the control unit 130 as functional blocks.

The imaging control unit 131 controls imaging of an image by the imaging unit 180 . Specifically, the imaging control section 131 may cause the imaging section 180 to capture images of the subject at predetermined intervals.

The projection control unit 132 controls projection of the inspection image by the laser irradiation unit 110 . Specifically, the projection control unit 132 reads the data of the projection image 10 including the data of the inspection image 50 from the storage unit 140 as shown in FIG. The laser output control unit 150 causes the laser irradiation unit 110 to irradiate the subject's retina 22 with laser light based on the data of the projection image 10 with a preset light amount.

FIG. 5B is a diagram schematically showing a state in which the data of the inspection image 50 are projected onto the retina 22. As shown in FIG.

By projecting the inspection image 50 onto an arbitrary position on the projection image 10 in this manner, the inspection image 50 can be projected onto an arbitrary position on the retina 22 .

In FIGS. 5A and 5B, the vertical and horizontal resolutions are roughly described for the sake of explanation. Usually rendered in multiple pixels.

The line-of-sight direction detection unit 133 analyzes the image data of the images of the pupil 25, the iris 26, and the like captured by the imaging unit 180, and detects the line-of-sight direction and movement of the eyeball 20 of the subject. Specifically, the line-of-sight direction detection unit 133 captures images of eyeballs such as pupils and eyelids of the subject and their surroundings, and detects the line-of-sight direction from the shape of the pupil, the positional relationship between the pupil and the eyelids, and the like. By performing the detection a plurality of times and comparing the results, it is determined whether or not the subject's eyeballs have moved.

For example, the line-of-sight direction detection unit 133 compares the pixel values of each pixel in a plurality of images, and if there are a certain number of pixels whose pixel value difference is equal to or greater than a predetermined value, it is determined that the subject's eyeball 20 has moved. You can judge.

The position information (data) of the inspection image 50 in each grid on the projection image 10 shown in FIG. information (data) associated with it.

The inspection processing unit 134 receives the position where the inspection image is projected onto the retina by the laser irradiation unit 110 controlled by the projection control unit 132, the line-of-sight direction data corresponding thereto, and the line-of-sight direction detected by the line-of-sight direction detection unit 133. Visual inspection processing is performed based on and.

6 and 7 are diagrams showing the inspection image 50. FIG. As shown in FIGS. 6 and 7 , the laser irradiation unit 110 projects the projection image 10 including the inspection image 50 onto the retina 22 under the control of the projection control unit 132 .

FIG. 6 shows a projection pattern in which the inspection image 50 is projected onto the retina 22, disappears, and is projected onto different positions. In other words, FIG. 6 shows a projection pattern in which the inspection image 50 is repeatedly projected onto the retina 22 while changing its position (moving).

FIG. 7 shows a projection pattern for moving the position of the inspection image 50 projected onto the retina 22 as indicated by arrows.

Data representing these projection patterns may be stored in the storage unit 140. The projection control unit 132 reads the projection patterns from the storage unit 140, and controls the laser irradiation unit 110 according to the read projection patterns. It can be projected onto the retina 22 . The projection control unit 132 also outputs data representing the projection pattern to the inspection processing unit 134 .

The inspection processing unit 134 recognizes the position where the inspection image is projected onto the retina 22 based on the position information of the inspection image 50 on the projection image 10, and when the position of the inspection image changes, the line-of-sight direction is changed. Visual inspection processing is performed based on whether the line-of-sight direction detected by the detection unit 133 changes.

In order to project the inspection image 50 onto an arbitrary position on the retina 22, the projection image 10 is projected using image data displaying the inspection image 50 at a position on the projection image 10 corresponding to that position. By comparing the line-of-sight direction detected by the line-of-sight direction detection unit 133 with the line-of-sight direction data of the test image 50, visual inspection processing is performed to determine whether the subject is visually recognizing the test image 50 or not.

Visual inspection processing can also be performed based on whether or not the line-of-sight direction detected by the line-of-sight direction detection unit 133 changes by sequentially projecting the projection images 10 having different positions of the inspection image 50 .

More specifically, the inspection processing unit 134 changes the position at which the inspection image is projected onto the retina 22 based on the position information of the inspection image 50 on the projection image 10 input from the projection control unit 132. Detect direction and timing. The inspection processing unit 134 also detects the direction and timing of change of the line-of-sight direction detected by the line-of-sight direction detection unit 133 .

Then, the inspection processing unit 134 determines that the difference between the direction in which the position on which the inspection image is projected changes and the direction in which the line-of-sight direction detected by the line-of-sight direction detection unit 133 changes is equal to or less than a predetermined angle, and When the timing at which the visual line direction detected by the visual line direction detection unit 133 changes with respect to the timing at which the projected position of the image is changed is less than or equal to a predetermined time, it is determined that the subject's vision is normal.

That the subject's vision is normal means that the subject is correctly viewing the inspection image. Visually recognizing a moving inspection image means capturing (seeing) the inspection image with the retina, tracking the inspection image, and recognizing the inspection image.

Instead of determining whether the timing delay is equal to or less than the predetermined time, it may be determined whether the speed in the line-of-sight direction is equal to or greater than a predetermined speed. The predetermined speed may be set to a speed obtained by adding a certain amount of margin to the average speed of line-of-sight walking when a person with normal vision responds to a moving object.

FIG. 8 is a diagram showing a flowchart representing processing executed by the control unit 130. As shown in FIG.

When the visual inspection apparatus 100 receives the inspection start instruction, the projection control unit 132 of the control unit 130 reads the projection pattern from the storage unit 140, controls the laser irradiation unit 110 according to the read projection pattern, and performs projection. Data representing the pattern is output to the inspection processing unit 134 (step S101). Thereby, an inspection image 50 (see FIGS. 6 and 6) is projected onto the retina 22 . The data representing the position of the inspection image 50 is position information indicated by coordinates on the projected image 10 .

Next, the line-of-sight direction detection unit 133 detects the line-of-sight direction based on the eyeball image of the subject's pupil 25, iris 26, etc., using the imaging unit 180 (step S102).

Next, the line-of-sight direction detection unit 133 determines the projection angle of the test image 50 and the line-of-sight direction angle from the projection angle information of the test image 50 projected in step S101 and the line-of-sight direction angle information detected in step S102. is equal to or less than a predetermined angle (step S103).

When the line-of-sight direction detection unit 133 determines that the difference between the projection angle of the inspection image 50 and the angle of the line-of-sight direction is equal to or less than the predetermined angle (S103: YES), the projection control unit 132 reads the projection pattern from the storage unit 140, controls the laser irradiation unit 110 according to the read projection pattern, and outputs data representing the projection pattern to the inspection processing unit 134 (step S104).

Next, the line-of-sight direction detection unit 133 detects the line-of-sight direction using the imaging unit 180 based on the eyeball image of the subject's pupil 25, iris 26, etc. (step S105).

The inspection processing unit 134 determines whether or not the difference between the direction in which the position on which the inspection image is projected changes and the direction in which the line-of-sight direction changes is equal to or less than a predetermined angle (step S106). First, it is intended to determine whether or not the subject's retina captures (sees) the test image by determining the difference in direction.

When the inspection processing unit 134 determines that the angle is equal to or less than the predetermined angle (S106: YES), the inspection processing unit 134 determines whether the delay of the timing of changing the line-of-sight direction with respect to the timing of changing the position where the inspection image is projected is equal to or less than a predetermined time. Determine (step S107). This is intended to determine the responsiveness when a subject recognizes an image captured by the retina.

If the test processing unit 134 determines that the timing delay is equal to or less than the predetermined time (S107: YES), it determines that the subject is viewing the test image normally (step S108). In this case, the subject captures and follows the moving test image with the retina (sees the test image and tracks the test image), and the image captured by the subject with the retina is transmitted to the brain. This is the case where the responsiveness in recognizing is good, and the subject is visually recognizing (following and recognizing) the inspection image.

Further, in step S103, when the line-of-sight direction detection unit 133 determines that the difference between the projection angle of the inspection image 50 and the angle of the line-of-sight direction is not equal to or less than the predetermined angle (S103: NO), the inspection image 50 Since there is a difference between the projection position and the line-of-sight direction, the inspection processing unit 134 determines that the subject is viewing the inspection image normally (step S109).

Further, when the test processing unit 134 determines NO in step S106 or S107, it determines that the subject does not normally view the test image (step S109). When the flow proceeds to step S109, the subject does not visually recognize the moving inspection image, and the subject has an abnormality in vision. Abnormality in vision means that the subject does not capture the test image with the retina (NO in step S106), or the responsiveness when the brain recognizes the image captured by the subject's retina is slow. This is the case (NO in step S107).

Here, in addition to determining whether or not the difference between the direction in which the position in which the inspection image is projected changes in step S106 and the direction in which the line-of-sight direction changes is equal to or less than a predetermined angle, in step S107 An embodiment has been described in which it is determined whether or not the delay in the timing at which the line-of-sight direction changes with respect to the timing at which the position on which the inspection image is projected is equal to or less than the predetermined time. However, without performing the determination in step S107, if YES in step S106, the process proceeds to step S108 to determine that the subject's vision is normal, and if NO in step S106, the process proceeds to step S109 to It may be determined that vision is not normal.

As described above, according to the embodiment, the test image is projected onto the retina of the subject by the laser beam irradiated on the retina of the subject, and the test image is moved in the patterns shown in FIGS. 6 and 7 as an example, It is determined whether or not the inspection image is normally viewed based on whether the line-of-sight direction detected by the line-of-sight direction detection unit 133 follows the inspection image.

Therefore, unlike conventional visual field testing devices, it is not necessary to keep the line of sight directed to the gaze point during testing, and the burden on the subject can be reduced.

In the above description, a form for inspecting whether or not the test image is visually recognized normally has been described. Off-central visual acuity can also be tested by projecting test images.

Therefore, it is possible to provide the visual inspection apparatus 100 and the visual inspection method that reduce the burden on the subject when visual inspection such as visual field, visual acuity, and visual recognition is performed.

The visual inspection apparatus 100 and the visual inspection method of the embodiment detect the line-of-sight direction of the subject without forcing the subject to look in a specific direction, and move the inspection image within a predetermined range of the detected line-of-sight direction. . Therefore, a visual test can be easily performed regardless of which direction the subject looks.

Children and the elderly may find it difficult to keep their eyes on one point, and this tendency is particularly pronounced when the examination takes a long time. From this point of view, the visual inspection apparatus 100 and the visual inspection method according to the embodiment can greatly reduce the burden on the subject when performing a visual inspection such as visual field, visual acuity, and visual recognition.

Further, when the subject has dementia, he/she may not be able to recognize that the visual test is to be performed, and may not be able to recognize the test image. Even with such a subject, as long as the eyes are open, the retina can be irradiated with the laser beam and the test image can be projected, so the visual test can be performed very easily. In addition, the physical and mental burden on the subject at this time can be greatly reduced.

In addition, when a subject has a disease such as cataract or corneal opacity, if the laser light can reach the retina through the anterior segment of the eye such as the cornea, the visual examination should be performed in the same manner as subjects without such disease. and determine whether the retina can capture an image. Even if a patient with a disease such as cataract or corneal opacity undergoes an operation to cure the disease such as cataract or corneal opacity, if retinal detachment or the like occurs, the vision will not be restored even after the operation. For such patients, visual inspection is performed before surgery using the visual inspection apparatus 100 and the visual inspection method of the embodiment to determine whether the retina is normal and whether the image captured by the retina can be recognized by the brain. It is possible to test whether or not it is, and it is possible to greatly reduce the physical, mental and economic burden on the patient.

In the above description, when NO is determined in step S106 or S107, it is determined that the test image is not normally viewed by the subject. If it is determined as NO, the test image is captured by the retina of the subject, but the response of the brain to recognize the test image is slow. Therefore, if NO is determined in step S107, it may be determined that image recognition in the subject's brain is not normal.

In addition, since the conventional visual field test apparatus measures only the lightness of the test image in the form of dots, the evaluation was of the rod function to distinguish between light and dark in the retina. The morphological visual inspection device 100 and the visual inspection method can also project an inspection image having spatial resolution and color vision components onto the retina. Therefore, it is possible to easily evaluate spatial discrimination (non-central visual acuity) near the fixation point, which is an important visual function of the retina, and color vision.

Also, FIG. 9 is a diagram showing a modified example of the inspection image 50. As shown in FIG. FIG. 9 shows an image of a dog as an inspection image. Since the use of such an inspection image can easily attract the interest of a child, the visual inspection can be performed more easily, and the burden on the subject can be reduced. The inspection image is not limited to dogs, and may be other animals such as cats or non-animals. An image that easily attracts the interest of not only children but also elderly people may be used.

In the above description, an image including the subject's eyeballs is captured by the imaging unit 180 in order to detect eyeball movement (change in line-of-sight direction), but the method for detecting eyeball movement is limited to this. not. For example, electrodes may be attached to the subject's face (upper and lower eyelids, etc.), and the motion of the subject's eyeballs may be detected by detecting the movement of facial muscles with an electromyograph. In this case, the imaging section 180 becomes unnecessary.

Although the visual inspection apparatus and the visual inspection method according to the exemplary embodiments of the present invention have been described above, the present invention is not limited to the specifically disclosed embodiments, and is subject to the claims. Various modifications and changes are possible without departing from the scope.

REFERENCE SIGNS LIST 100 vision inspection device 110 laser irradiation unit 130 control unit 131 imaging control unit 132 projection control unit 133 line-of-sight direction detection unit 134 inspection processing unit 180 imaging unit

Claims (8)

a laser irradiation unit having a light source for generating a laser beam and a scanning mirror for scanning the laser beam;
a line-of-sight direction detection unit that detects the line-of-sight direction of the subject;
generating a projection image to be projected onto the retina of the subject by the laser beam, and generating an inspection image on a grid at an arbitrary position among a plurality of grids on the projection image; a projection control unit that projects the inspection image at an arbitrary position;
A storage unit for storing inspection image data representing the inspection image, wherein the position information of each lattice is a standard and reference line of sight when the subject is visually recognizing the position indicated by the position information. a storage unit that stores direction information in correspondence;
Positional information of each lattice of the inspection image on the projected image is associated with positional information on the retina of the subject. an inspection processing unit that performs inspection processing for out-of-center visual acuity by projecting the inspection image in a direction deviating from the line-of-sight direction of the subject based on line-of-sight direction information detected by the unit. . The projection control unit generates a test image having a spatial resolution or a color vision component and projects it onto the retina of the subject, thereby performing spatial discrimination including off-central vision on the retina and color vision test processing. A visual inspection device according to claim 1. 3. The visual inspection apparatus according to claim 1, wherein said inspection image is an image representing a predetermined character. the projection control unit moving the position of the inspection image projected onto the projection image based on predetermined movement pattern information;
The line-of-sight direction detection unit detects line-of-sight direction information of the subject,
3. The visual inspection apparatus according to claim 1, wherein visual inspection processing is performed based on the movement pattern information and the visual line direction information of the subject. The line-of-sight direction detection unit is an imaging device,
3. The visual inspection apparatus according to claim 1, wherein said projection control unit detects the line-of-sight direction of said subject based on image data captured by said imaging device. 3. The visual inspection apparatus according to claim 1, wherein the line-of-sight direction detection unit detects the line-of-sight direction of the subject based on movement of facial muscles of the subject. a laser irradiation unit having a light source for generating a laser beam and a scanning mirror for scanning the laser beam;
a line-of-sight direction detection unit for detecting a line-of-sight direction of a subject; generating a projection image projected onto the retina of the subject by the laser beam; a projection control unit that projects the inspection image onto an arbitrary position on the retina of the subject by generating
A storage unit for storing inspection image data representing the inspection image, wherein the position information of each lattice is a standard and reference line of sight when the subject is visually recognizing the position indicated by the position information. a storage unit that stores direction information in correspondence;
including
Positional information of each lattice of the inspection image on the projected image is associated with positional information on the retina of the subject. A visual inspection method for performing an off-central visual acuity test process by projecting the test image in a direction deviating from the line-of-sight direction of the subject based on the line-of-sight direction information detected by the visual inspection method. 8. The method according to claim 7, wherein a test image having a spatial resolution or a color vision component is generated and projected onto the retina of the subject to perform spatial discrimination including out-of-center visual acuity on the retina and color vision test processing. Visual inspection method.

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