JP2020010821A - Visual field acuity examination device and visual field acuity examination method - Google Patents

Abstract

To perform examination without being influenced by a direction of a visual line of a subject.SOLUTION: A visual field acuity examination device includes: a laser projection part having a light source for emitting a light beam and a scanning mirror for scanning the light beam and generating an image light beam for examination, which projects the image light beam for examination onto the retina of a subject as an image for examination; a driving part for moving the laser projection part; a visual line direction detection part for detecting a direction of a visual line of the subject; and a control part for causing the driving part to move the laser projection part according to the visual line direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a visual acuity test apparatus and a visual acuity test method.

  Conventionally, a gazing point is presented in a housing that covers the subject's field of view, and the subject's gaze is directed toward the gazing point. There is known a visual field inspection device that changes toward the same.

  In recent years, a visual field inspection apparatus using a retinal scanning technique of projecting a test image onto the retina by irradiating a retina of a subject with laser light is known.

JP 2009-142313 A

  In the conventional visual field inspection apparatus, it is necessary to keep the line of sight at the point of gaze during the inspection, so that the burden on the subject is large. Further, in the visual field inspection apparatus using the retinal scanning technique, when the line of sight of the subject deviates from the gazing point, the laser beam does not pass through the pupil of the subject, the inspection image is not projected, and the inspection is interrupted.

  The disclosed technology has been made in view of the above circumstances, and has an object to perform a visual inspection such as a visual field or a visual acuity without being affected by the direction of the subject's line of sight.

  The disclosed technology has a light source that emits a light beam, and a scanning mirror that scans the light beam to generate a test image light beam, and a laser that projects the test image light beam as a test image to a subject's retina. Projection unit, a drive unit that moves the laser projection unit, a gaze direction detection unit that detects the gaze direction of the subject, and a control unit that moves the laser projection unit according to the gaze direction to the drive unit. And a visual acuity inspection apparatus having:

  A visual inspection such as a visual field or visual acuity can be performed without being affected by the direction of the subject's line of sight.

It is a figure showing appearance of a visual field visual inspection device of a first embodiment. FIG. 2 is a diagram illustrating a hardware configuration of the visual acuity inspection apparatus according to the first embodiment. FIG. 3 is a diagram illustrating a laser projection unit according to the first embodiment. FIG. 5 is a diagram illustrating the movement of the laser projection unit with respect to the eyeball in the first embodiment. FIG. 3 is a diagram illustrating functions of a control unit according to the first embodiment. It is a figure showing an example of a picture for inspection. It is a flowchart explaining operation | movement of the visual field vision inspection apparatus of 1st embodiment. FIG. 3 is a diagram illustrating projection of an inspection image by a laser projection unit according to the first embodiment. It is a figure explaining movement of a laser projection part of a second embodiment. It is a figure explaining the function of the control part of a 2nd embodiment. It is a flowchart explaining operation | movement of the visual field vision inspection apparatus of 2nd embodiment. It is a figure explaining projection of an inspection picture by a laser projection part of a second embodiment. It is a figure explaining hardware constitutions of a visual acuity inspection device of a third embodiment. It is a figure explaining operation of a laser projection part of a third embodiment. It is a figure explaining the function of the control part of a 3rd embodiment. It is a flowchart explaining operation | movement of the visual field vision inspection apparatus of 3rd Embodiment. It is a figure showing a modification of a laser projection part. It is a figure explaining attachment of an imaging part. It is a figure explaining a laser irradiation part of a 4th embodiment.

(First embodiment)
Hereinafter, a first embodiment will be described with reference to the drawings. FIG. 1 is a diagram illustrating an appearance of a visual acuity inspection apparatus according to a first embodiment.

  The visual acuity inspection apparatus 100 according to the present embodiment includes a pedestal 101, a frame 102, adjustment members 103 and 104, base portions 105, support portions 106a and 106b, image projection portions 107a and 107b, and imaging portions 180a and 180b.

  In the visual acuity inspection apparatus 100 of the present embodiment, the pedestal 101 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 the support units 106a and 106b, and have a laser irradiation unit and a drive unit described below inside. The image projection units 107a and 107b irradiate laser light to the left and right eyes of the subject whose visual field and visual acuity are to be inspected by the respective laser irradiation units, and project an inspection image on the retina of the subject.

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

  The adjustment unit 103 moves the support unit 106 on which the image projection unit 107 is supported in the Y-axis direction shown on the paper. The adjustment unit 104 moves the image projection unit 107 in the Z-axis direction along the support unit 106.

  The visual acuity testing apparatus 100 projects an image by bringing the subject's chin and forehead into contact with each of the pedestal 101 and the frame 102, and adjusting the sections 103 and 104 so that the subject looks into the image projecting section 107. The inspection is performed with the unit 107 close to the eyeball.

  Further, in the visual field visual acuity test apparatus 100 of the present embodiment, the direction of the line of sight of the subject is detected by detecting the movement of the subject's eyeball from the image of the subject's eyeball captured by the imaging unit 180, and the image projection unit 106 Inside, the laser irradiation unit is moved by the driving unit in accordance with the movement of the eyeball of the subject (the line of sight). More specifically, in the present embodiment, when the eyeball of the subject moves during the examination, the laser irradiating unit is driven by the driving unit so that the laser beam emitted from the laser irradiating unit passes through the pupil of the subject. Move and change the irradiation position of the laser.

  Therefore, according to the present embodiment, in the retinal scanning type visual acuity inspection apparatus, it is possible to suppress the laser light from not passing through the pupil of the subject and preventing the inspection image from being projected. In other words, according to the present embodiment, even when the line of sight of the subject is not directed in one direction indicated by the gazing point or the like, the laser beam can pass through the pupil of the subject, and can be directed in the direction of the subject's line of sight. The inspection can be performed without being affected.

  The hardware configuration of the visual acuity inspection apparatus 100 will be described below with reference to FIG. FIG. 2 is a diagram illustrating a hardware configuration of the eyesight test apparatus according to the first embodiment.

  The visual acuity inspection apparatus 100 according to the present embodiment includes a laser projection unit 110, a communication unit 120, a control unit 130, a storage unit 140, a laser output control unit 150, a driving unit 160, an operation unit 170, and an imaging unit 180.

  The laser projection unit 110 irradiates the subject's retina with laser light based on the inspection image data stored in the storage unit 140 at a preset light amount. That is, the laser projecting unit 110 is an eyepiece for the subject, and by putting his / her eyes on the laser projecting unit 110 (looking into the laser projecting unit 110), the subject visually recognizes an inspection image or the like projected on the retina. In addition, a visual field test and a visual acuity test can be performed.

  The communication unit 120 is a communication device for performing communication between the visual field 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 field visual acuity inspection apparatus 100 via a wire or the like. You may go. The communication method by the communication unit 120 may be any method as long as the visual field visual inspection device 100 and the external device can communicate with each other.

  In the present embodiment, information or the like indicating the test result input by operating the operation unit 170 may be output to a device external to the visual acuity test device 100 via the communication unit 120.

  The control unit 130 is, for example, an arithmetic processing device, and controls the entire operation of the visual acuity inspection apparatus 100 of the present embodiment. The storage unit 140 stores a program executed by the control unit 130, various values acquired by calculation, and the like. Further, the storage unit 140 stores inspection image data indicating an inspection image used for the inspection.

  The laser output control unit 150 may be an arithmetic processing unit or the like for controlling the laser projection unit 110. For example, the laser output control unit 150 may emit a laser beam based on the inspection image data stored in the storage unit 140 at a set light amount. , From the laser projection unit 110.

  The drive unit 160 moves the laser projection unit 110 according to an instruction from the control unit 130. The drive unit 160 of the present embodiment may be, for example, a power source such as a motor for rotating the laser projection unit 110.

  The operation unit 170 performs various operations (inputs) on the visual field visual acuity inspection apparatus 100. Specifically, for example, the operation unit 170 may be an input device used for input of an operation of instructing the start of an inspection by the visual field visual acuity inspection apparatus 100 or an operation of specifying an optotype visually recognized by a subject. good. The operation unit 170 is preferably, for example, a keyboard or a joystick on which arrows in up, down, left, and right directions are printed.

  In the present embodiment, if the operation unit 170 has such a configuration, for example, when the image for inspection includes an image of a Landolt ring which is an index for visual acuity measurement, if the cut is right, The result of the visual recognition can be input as information (test result) indicating the visual target visually recognized by the subject P by pressing the arrow keyboard or tilting the keyboard to the right with a joystick.

  In addition, since the subject P puts his or her eyes on the laser projection unit 110 during the visual acuity test, removing the eyes from the laser projection unit 110 to view the operation unit 170 is inefficient. For this reason, the operation unit 170 may be a keyboard on which operation components indicating up, down, left, and right are arranged. Further, it is more preferable that the keyboard be provided with projections or the like so that input can be performed without looking at the keyboard.

  The imaging unit 180 is a camera arranged near the laser projection unit 110. In the present embodiment, the movement of the subject's eyeball 20 and the orientation 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 referred to as a gaze direction detection unit for detecting the gaze direction of the subject.

  When the examination is started, the imaging unit 180 according to the present embodiment captures an image of the subject and transfers the image data to the control unit 130.

  Although not shown, the visual acuity inspection apparatus 100 according to the present embodiment may include an output unit (display) for outputting various types of information. In addition, an input screen or the like for inputting a result of the eyesight test by the subject P based on the test image may be displayed on the display. Further, the output unit may be for writing information indicating the inspection result stored in the storage unit 140 to a recording medium or the like.

  Next, the laser projection unit 110 of the present embodiment will be described with reference to FIG. FIG. 3 is a diagram illustrating a laser projection unit according to the first embodiment.

  The laser projection unit 110 of the present embodiment irradiates the retina 22 of the subject's eyeball 20 with laser light using Maxwell's vision.

  The laser projection unit 110 has a light source 111, an adjustment unit 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 of the present embodiment is, for example, a biaxial MEMS (Micro Electro Mechanical Systems) mirror.

  In the laser projection unit 110, the adjustment unit 112 adjusts the numerical aperture (NA) and / or the beam diameter of the laser light L emitted from the light source 111. The laser light L is a visible laser light of a red laser light, a green laser light, and a blue laser light.

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

  Next, the operation of the laser projection unit 110 according to the present embodiment will be described with reference to FIG. FIG. 4 is a diagram for explaining the movement of the laser projection unit 110 with respect to the eyeball 20 in the first embodiment. The pupil 25, the iris 26, the retina 22, the laser projection region 30 on the retina, and the laser The positional relationship with the projection unit 110 is shown.

  In the visual acuity inspection apparatus 100 of the present embodiment, the laser projection unit 110 is rotated (rotated) around the eyeball 20 in accordance with the movement of the eyeball 20 of the subject. More specifically, in the present embodiment, the laser projection unit 110 is moved so that the laser projection unit 110 is always located in front of the subject's eyeball 20.

  In the present embodiment, by moving the laser projection unit 110 in this way, the laser light L passes through the pupil 25 of the subject even if the subject's line of sight does not face one direction. Can be projected.

  FIG. 4A shows a state in which the subject turns his or her gaze rightward from the front. In this case, the subject's pupil 25 faces the same direction as the subject's line of sight.

  In this case, even if the laser projecting unit 110 irradiates the laser light L from the same place as when the subject is facing the front, the laser light L does not pass through the pupil 25 and the test image is displayed on the retina 22 of the subject. Is not projected.

  Therefore, in the present embodiment, the laser projection unit 110 is moved so that the laser projection unit 110 is located in front of the pupil 25 of the subject. In other words, in the present embodiment, the position of the laser projection unit 110 is moved in accordance with the movement of the eyeball 20 of the subject so that the laser projection unit 110 is positioned in the line of sight of the subject.

  In the case of FIG. 4A, the optical axis of the laser light L emitted from the laser projection unit 110 is inclined by θ1 degrees from the optical axis of the reference laser light L in accordance with the movement of the eyeball 20 of the subject. , The laser projection unit 110 is being moved.

  The optical axis of the reference laser beam L may be, for example, the optical axis of the laser beam when an index image or the like is projected on the retina 22 of the subject at the start of the examination.

  FIG. 4B shows a state where the subject turns his / her gaze leftward from the front. In this case, in the present embodiment, the laser projection is performed such that the optical axis of the laser beam emitted from the laser projection unit 110 is inclined by θ2 degrees from the optical axis of the reference laser beam in accordance with the movement of the eyeball 20 of the subject. The unit 110 is being moved.

  In the example of FIG. 4, the angles θ1 and θ2 are angles on the XY plane, but in the present embodiment, the laser projection unit 110 can be rotated in a three-dimensional direction.

  Note that, specifically, the laser projection unit 110 of the present embodiment moves along an arc that is a part of the outer periphery of the eyeball 20 according to the movement of the eyeball 20. In the following description, the laser projector 110 is rotated or the laser projector 110 is rotated to move the laser projector 110 so that the locus of movement becomes an arc along the outer periphery of the eyeball 20. Move.

  In addition, the ratio of the length of the arc that is the locus of movement of the laser projection unit 110 to the outer periphery of the eyeball 20 may be expressed as the rotation angle of the laser projection unit 110.

  Next, a function of the control unit 130 of the present embodiment will be described with reference to FIG. FIG. 5 is a diagram illustrating functions of the control unit according to the first embodiment.

  The control unit 130 according to the present embodiment includes an imaging control unit 131, a position determination unit 132, a projection control unit 133, an image processing unit 134, an angle calculation unit 135, and a drive control unit 136.

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

  The position determination unit 132 of the present embodiment determines the position of the laser projection unit 110 at the start of the inspection. Specifically, the position determination unit 132 sets the position of the laser projection unit 110 at this time to an initial position when an operation indicating that the reference index has been visually recognized is received from the subject at the start of the examination. decide.

  The projection control unit 133 controls the projection of the inspection image by the laser projection unit 110. Specifically, the projection control unit 133 reads out the inspection image data from the storage unit 140 and passes it to the laser output control unit 150. The laser output control section 150 causes the laser projection section 110 to irradiate the subject's retina 22 with a laser beam based on the inspection image data at a preset light amount.

  The image processing unit 134 analyzes the image data of the image of the pupil 25, the iris 26, and the like captured by the imaging unit 180, and detects the movement (the direction of the line of sight) of the subject's eyeball 20. Specifically, when the image of the subject is captured, the image processing unit 134 compares the captured image with the image captured immediately before, and determines whether or not the eyeball of the subject has moved based on the result of the comparison. In other words, the image processing unit 134 detects a change in the gaze direction of the subject according to the comparison result between the images.

  For example, the image processing unit 134 compares the pixel values of the plurality of images for each pixel, and determines that the eyeball 20 of the subject has moved when a certain number of pixels have a pixel value difference equal to or greater than a predetermined value. You may.

  The angle calculation unit 135 calculates an angle for rotating the laser projection unit 110 when the image processing unit 134 determines that the eyeball 20 of the subject has moved. Specifically, the angle calculation unit 135 calculates a change in the gaze direction of the subject from the two images compared in the image processing unit 134, and calculates the angle by which the laser projection unit 110 is rotated based on the change in the gaze direction. It may be calculated.

  The angle calculation unit 135 of the present embodiment of the angle calculated by the angle calculation unit 135 compares the gaze direction of the subject when the examination is started with the gaze direction of the subject when the imaging unit 180 acquires the image. Alternatively, the angle at which the laser projection unit 110 is rotated may be calculated.

  The drive control unit 136 controls the drive unit 160 to rotate the laser projection unit 110 by the angle calculated by the angle calculation unit 135.

  Next, an inspection image of the present embodiment will be described with reference to FIG. FIG. 6 is a diagram illustrating an example of the inspection image.

  The inspection image 60 shown in FIG. 6 includes a plurality of images of Landolt rings having different sizes. In the inspection image 60 of the present embodiment, by arranging a plurality of Landolt rings having different sizes in this manner, in addition to the inspection of visual acuity, a visual field inspection for inspecting the presence or absence of a visual field defect can be performed. .

  For example, it is assumed that when the inspection image 60 is projected on the retina 22 of the subject, the subject cannot visually recognize the Landolt's ring arranged in the region 61. In this case, it can be seen that there is a defect in the visual field of the subject.

  Note that the inspection image of the present embodiment is not limited to the inspection image 60 shown in FIG. Inspection images of the present embodiment may include images of indices (characters, numbers, etc.) other than Landolt rings. Further, the inspection image may be a general image. Specifically, for example, images such as fruits and plants, vehicles and buildings may be used.

  Further, the inspection image 60 of the present embodiment may be superimposed on the index image serving as a reference for determining the position of the laser projection unit 110 when the inspection is started.

  Next, the operation of the visual acuity inspection apparatus 100 according to the present embodiment will be described with reference to FIG. FIG. 7 is a flowchart illustrating an operation of the visual field visual inspection apparatus according to the first embodiment.

  When receiving the instruction to start the inspection, the visual field inspection apparatus 100 according to the present embodiment causes the projection control unit 133 of the control unit 130 to provide the laser projection unit 110 with a laser serving as a reference for determining the position of the laser projection unit 110. Light is irradiated (step S701). In other words, the visual acuity inspection apparatus 100 projects the image of the reference index on the retina 22 of the subject by the laser projection unit 110.

  Subsequently, the control unit 130 of the visual field visual acuity inspection apparatus 100 determines whether or not the imaging unit 180 has captured an eyeball image of the subject's pupil 25, iris 26, or the like (step S702). Specifically, the control unit 130 determines whether or not the imaging control unit 131 has acquired image data indicating the eyeball image of the subject captured by the imaging unit 180.

  If an eyeball image of the subject has not been captured in step S702, the visual acuity test apparatus 100 waits until a subject image is captured.

  When an eyeball image of the subject is captured in step S702, the control unit 130 causes the position determination unit 132 to determine the position of the laser projection unit 110 at this time as an initial position (step S703).

  Note that the imaging unit 180 may capture the subject's eyeball image when the subject performs an operation to permit the operation unit 170 to capture the own eyeball image. In addition, the subject may permit imaging when, for example, visually recognizing the index projected on his or her retina 22.

  Subsequently, the control unit 130 reads out the inspection image data stored in the storage unit 140 by the projection control unit 133, and outputs the inspection image by the laser output control unit 150 and the laser projection unit 110 to the subject's retina. 22 (step S704).

  Subsequently, the control unit 130 determines whether or not the subject's eyeball 20 has moved (step S705). Specifically, the control unit 130 controls the imaging unit 180 by the imaging control unit 131, acquires image data indicating the eyeball image of the subject at regular intervals, and compares the image data by the image processing unit 134. Then, it is determined whether or not the eyeball 20 of the subject has moved.

  When it is determined in step S705 that there is no motion, the control unit 130 proceeds to step S708 described below.

  If it is determined in step S705 that there is a movement, the control unit 130 causes the angle calculation unit 135 to calculate the rotation angle of the laser projection unit 110 (step S706).

  Subsequently, the control unit 130 controls the optical axis of the laser beam emitted from the laser projection unit 110 after rotation and the optical axis of the laser beam emitted from the laser projection unit 110 at the initial position by the drive control unit 136. The laser projection unit 110 is rotated such that the angle becomes the calculated rotation angle (step S707).

  Subsequently, the control unit 130 determines whether the inspection has been completed (step S708). Specifically, the control unit 130 may end the inspection when the operation unit 170 performs an operation to instruct the end of the inspection.

  If the inspection has not been completed in step S708, the control unit 130 returns to step S705.

  If the inspection has been completed in step S708, the control unit 130 controls the drive unit 160 by the drive control unit 136 to return the laser projection unit 110 to the initial position (step S709), and ends the processing.

  Hereinafter, with reference to FIG. 8, the operation of the visual field visual inspection apparatus 100 of the present embodiment will be specifically described. FIG. 8 is a diagram illustrating projection of the inspection image by the laser projection unit according to the first embodiment.

  FIG. 8A shows a state where the subject's eyeball 20 is facing the front. Here, the position of the laser projection unit 110 shown in FIG. FIG. 8B shows a state in which the subject's eyeball 20 faces right, and FIG. 8C shows a state in which the subject's eyeball 20 faces left.

  As shown in FIG. 8A, when the laser projection unit 110 irradiates the eyeball 20 of the subject with the laser beam L based on the image data for inspection at the initial position, the laser beam L passes through the pupil 25 of the subject and the retina. The inspection image 60 is projected onto the image 22. At this time, the area where the inspection image 60 is drawn (projected) on the retina 22 of the subject is an area scanned by the scanning unit 114 of the laser projection unit 110, and in the example of FIG. Become. In the following description, the area where the test image 60 is drawn on the retina 22 of the subject will be referred to as the test image drawing area.

  When the inspection image 60 is projected onto the drawing area 30, the visual field of the subject becomes like a visual field 81. At this time, the subject performs a visual acuity test by inputting information indicating whether or not a break in the Landolt ring can be visually recognized from the test image 60 in the visual field 81 to the visual acuity visual acuity testing apparatus 100 using the operation unit 170. be able to.

  In addition, the subject is informed in advance of the number of Landolt rings included in the inspection image 60, and inputs information indicating whether or not all Landolt rings have been visually recognized through the operation unit 170, thereby performing a visual field test. It can be carried out.

  In the visual acuity inspection apparatus 100 according to the present embodiment, the laser projection unit 110 rotates in accordance with the gaze direction (movement of the eyeball 20) of the subject. Therefore, in the present embodiment, the laser projection unit 110 is always positioned in front of the eyeball 20 of the subject.

  Therefore, both the subject's visual field 82 in FIG. 8B and the subject's visual field 83 in FIG. 8C are the same as the visual field 81 in FIG. 8A.

  More specifically, in the present embodiment, as shown in FIG. 8B, when the pupil 25 of the subject is facing right, the laser projection unit 110 is rotated clockwise so as to be in front of the pupil 25. And irradiates the laser light L. Therefore, even in the state of FIG. 8B, the test image 60 on the retina 22 of the subject is projected onto the drawing area 30.

  In this embodiment, when the subject's pupil 25 is facing left as shown in FIG. 8C, the laser projection unit 110 rotates counterclockwise so as to be in front of the pupil 25. Then, a laser beam L is irradiated. Therefore, even in the state of FIG. 8C, the test image 60 on the retina 22 of the subject is projected onto the drawing area 30.

  As described above, in the present embodiment, since the laser projection unit 110 rotates and moves following the movement of the eyeball 20 of the subject, even if the subject does not fixate on a specific gazing point during the examination, the visual field examination is performed. It can be performed. Therefore, according to the present embodiment, the burden on the subject in the examination can be reduced.

  Further, according to the present embodiment, since it is not necessary to fixate the fixation point, for example, a subject having a disease in the macula or the like or a subject having a defective visual field at the central portion of the retina. In addition, it is possible to test the visual field and the visual acuity even for a subject who cannot fixate the fixation point.

  In the present embodiment, even when the movement of the eyeball 20 is not detected, the laser projection unit 110 may be moved at a predetermined rotation angle like a pendulum.

  In the example of FIG. 8C, the laser projection unit 110 is further moved after rotating the laser projection unit 110 around the eyeball 20 in accordance with the movement of the eyeball 20.

  In the example of FIG. 8C, the laser projecting unit 110 is moved such that the angle of the laser beam L1 with respect to the optical axis of the laser beam L emitted from the moved laser projecting unit 110 becomes a constant angle θ3. .

  In the present embodiment, by moving the laser projection unit 110 in this manner, the area on the retina 22 where the inspection image is projected can be expanded. Note that the angle θ3 is an angle at which the laser light L1 passes through the pupil 25.

  In the example of FIG. 8C, the area where the inspection image 60 is projected by the laser light L is the drawing area 30. The area where the inspection image 60 is projected by the laser beam L1 is the area 31. Since the region 31 includes a region that is not included in the drawing region 30, the visual field and the visual acuity can be inspected for a wider range of the retina 22.

  As a modification of the present embodiment, the drive unit 160 not only rotates the laser projection unit 110 but also has a function of moving the rotation center of rotation, and also measures the axial length of the eyeball 20. A measurement unit may be provided. Thereby, in the modification, the position of the laser projection unit 110 can be set to match the axial length of the eyeball 20.

  Here, the axial length is the length from the cornea to the retina, and the length is caused by hyperopia, myopia, and the like, and has individual differences. The axial length is, for example, from the subject's pupil toward the retina, irradiating the invisible laser light from the laser projection unit 110, receiving the reflected light of the invisible laser light, and detecting the phase difference between the emitted light and the received light. Then, it can be measured by the phase difference.

  The laser beam projected from the laser projection unit 110 is projected so as to be focused on the retina 22 of the eyeball 20. However, depending on the axial length, the laser beam may not be focused on the retina 22. sell.

  Therefore, in the modification, the position of the center of rotation of the laser projection unit 110 is optimized according to the axial length measured by the axial length measuring unit, so that the position of the focal point of the laser beam can be accurately determined. The upper position can be set, and the resolution of the projected image can be optimized.

  Further, while changing the position of the center of rotation of the laser projection unit 110, the laser beam is applied to the eyeball 20 of the subject, and the subject is focused (when the subject visually recognizes and focuses). Can be set as the optimal position of the laser projection unit 110.

  In addition, the inspection image 60 of the present embodiment does not include an image of an index serving as a gazing point. This is because the direction of the subject's pupil 25 is detected by detecting the movement of the subject's eyeball 20 by the imaging unit 180, so that it is not necessary to fix the direction of the subject's line of sight in one direction.

  Further, in the present embodiment, an image including the eyeball 20 of the subject is captured by the imaging unit 180 in order to detect the movement of the eyeball 20 (change in the line of sight). Is not limited to this.

  In the present embodiment, for example, electrodes may be attached to the subject's face (upper and lower eyelids, etc.), and the movement of the subject's eye 20 may be detected by an electromyograph. In this case, the imaging unit 180 becomes unnecessary.

  Further, for example, when the subject starts an examination, the control unit 130 of the present embodiment causes the operation unit 170 to input information for identifying the subject, and outputs information indicating the examination result for each subject to the subject. The information may be stored for each subject in association with the information for specifying. The information for identifying the subject may be, for example, the name of the subject or an ID or the like assigned to the subject.

(Second embodiment)
Hereinafter, a second embodiment will be described with reference to the drawings. The second embodiment differs from the first embodiment in that the laser projection unit 110 is moved horizontally. Therefore, in the following description of the second embodiment, differences from the first embodiment will be described, and those having the same functional configuration as the first embodiment will be described in the description of the first embodiment. The same reference numerals are used as those used, and the description is omitted.

  FIG. 9 is a diagram illustrating the movement of the laser projection unit according to the second embodiment. FIG. 9A shows a state in which the subject turns his or her gaze rightward from the front, and FIG. 9B shows a state in which the subject turns his or her gaze leftward from the front. FIG. 9C shows an area on the retina 22 of the subject on which the inspection image is projected.

  In the present embodiment, when the subject's eyeball 20 turns his / her gaze rightward, the laser projection unit 110 is translated rightward. Specifically, in the present embodiment, the laser projection unit 110 moves in the X-axis direction or the Y-axis direction.

  In this case, the laser light emitted from the laser projection unit 110 passes through the pupil 25 from a direction different from the gaze direction of the subject. Therefore, the region 32 that is the projection region in the case of FIG. 9A is located at the right end of the retina 22 as compared with the region 30 that is the projection region when the laser projection unit 110 is in the direction of the subject's line of sight. This is a region approaching (see FIG. 8).

  Similarly, the region 33 that is the projection region in the case of FIG. 9B is compared with the region 30 that is the projection region when the laser projection unit 110 is in the direction of the subject's line of sight. (See FIG. 8).

  As described above, in the present embodiment, the laser projection unit 110 is translated in accordance with the movement of the eyeball 20 of the subject, and as shown in FIG. 9 (C), the projection regions are regions 30, 32, and 33. Area 34. Therefore, according to the present embodiment, a visual field test and a visual acuity test can be performed on an area other than the macula of the retina 22 of the subject.

  FIG. 10 is a diagram illustrating functions of a control unit according to the second embodiment.

  The control unit 130A according to the present embodiment includes an imaging control unit 131, a position determination unit 132, a projection control unit 133, an image processing unit 134, a movement amount calculation unit 135A, and a drive control unit 136.

  The movement amount calculation unit 135A of the present embodiment calculates the movement amount of the laser projection unit 110 when the image processing unit 134 detects the movement of the subject's eye 20.

  The movement amount of the laser projection unit 110 indicates a distance and a direction in which the laser projection unit 110 is moved from an initial position. The movement amount calculation unit 135A of the present embodiment calculates the direction in which the laser projection unit 110 is moved and the movement distance from the result of the comparison between the images by the image processing unit 134.

  Next, the operation of the visual field visual inspection apparatus 100A of the present embodiment will be described with reference to FIG. FIG. 11 is a flowchart illustrating the operation of the visual acuity inspection apparatus according to the second embodiment.

  The processing from step S1101 to step S1105 in FIG. 11 is the same as the processing from step S701 to step S705 in FIG. 7, and a description thereof will be omitted.

  When the movement of the subject's eyeball 20 is detected in step S1105, the control unit 130A calculates the movement amount of the laser projection unit 110 by the movement amount calculation unit 135A (step S1106). Subsequently, the control unit 130A controls the drive unit 160 by the drive control unit 136 to move the laser projection unit 110 in the calculated direction by the calculated distance (step S1107).

  Steps S1108 and S1109 in FIG. 11 are the same as steps S708 and S709 in FIG.

  Next, the projection of the inspection image by the laser projection unit 110 of the present embodiment will be described with reference to FIG. FIG. 12 is a diagram illustrating projection of the inspection image by the laser projection unit according to the second embodiment.

  FIG. 12A shows a state in which the subject's eyeball 20 faces front. Here, the position of the laser projection unit 110 shown in FIG. 12A is an initial position. FIG. 12B shows a state in which the subject's eyeball 20 faces the right side, and FIG. 12C shows a state in which the subject's eyeball 20 faces the left side.

  In the example of FIG. 12A, the area 30 that is the projection area of the inspection image 60 is the center of the retina 22. Therefore, the subject visually recognizes the inspection image 60 in the center of the visual field 81.

  In the example of FIG. 12B, the region 32 that is the projection region of the inspection image 60 is a portion biased to the right of the retina 22. Therefore, the subject visually recognizes the inspection image 60 in the left part of the visual field 82. In the example of FIG. 12C, the region 33 that is the projection region of the inspection image 60 is a portion that is biased to the left of the retina 22. Therefore, the subject visually recognizes the inspection image 60 in the right part of the visual field 83.

  That is, in the present embodiment, the inspection image 60 is projected on the retina 22 in the direction in which the subject turns his / her gaze. Therefore, in the present embodiment, in the visual field of the subject, the inspection image 60 is visually recognized in a region opposite to the direction in which the subject turns his or her gaze.

  As described above, according to the present embodiment, by simply moving the laser projection unit 110 in parallel with the line of sight of the subject, it is possible to inspect the presence or absence of a visual field defect in an area other than the central part (macula) of the retina 22. Can be.

  For example, in the visual field 81 of FIG. 12A, the subject who can visually recognize all Landolt rings included in the inspection image 60 is included in the region 62 of the inspection image 60 in the visual field 82 of FIG. Assume that the Landolt ring cannot be visually recognized.

  In this case, the subject has no visual field loss in the macula, but has some disease in the end region of the retina 22 and the visual field corresponding to that part is defective.

  As described above, according to the present embodiment, since the laser projection unit 110 is moved in accordance with the direction of the subject's line of sight, the visual field test and the eyesight test can be performed without being affected by the direction of the subject's line of sight.

(Third embodiment)
Hereinafter, a third embodiment will be described with reference to the drawings. The third embodiment is different from the second embodiment in that the inspection image includes an image of an index serving as a gazing point, and the projection position of the inspection image is changed together with the image of the index. Accordingly, in the following description of the third embodiment, differences from the second embodiment will be described, and those having the same functional configuration as the second embodiment will be described in the description of the second embodiment. The same reference numerals are used as those used, and the description is omitted.

  FIG. 13 is a diagram illustrating a hardware configuration of an eyesight test apparatus according to the third embodiment.

  The visual acuity inspection apparatus 100A of the present embodiment includes a laser projection unit 110, a communication unit 120, a control unit 130B, a storage unit 140, a laser output control unit 150, a driving unit 160, an operation unit 170, and includes an imaging unit 180. I haven't.

  That is, the visual acuity inspection apparatus 100A of the present embodiment does not include a unit for detecting the movement of the eyeball 20 of the subject.

  The control unit 130B of the present embodiment causes the laser projection unit 110 to project the inspection image stored in the storage unit 140 onto the retina 22 of the subject while the laser projection unit 110 is translated by the drive unit 160.

  Hereinafter, the operation of the laser projection unit 110 according to the present embodiment will be described with reference to FIG. FIG. 14 is a diagram illustrating the movement of the laser projection unit according to the third embodiment.

  In the present embodiment, by moving the projection position of the image of the target (fixation target) image on the retina 22 of the subject, the gaze of the subject is guided in the direction in which the image of the fixation target moves.

  FIG. 14A shows a state in which the subject turns his or her eyes to the laser projection unit 110. In the present embodiment, the area in which the inspection image 60A is drawn by the laser light is moved in the field of view when the subject turns his or her gaze to the laser projection unit 110. Note that the inspection image 60A of the present embodiment includes an image 90 of an index (fixation index) serving as a gazing point.

  In the example of FIG. 14A, the area where the laser light is projected by the laser projection unit 110 in the subject's field of view 86 is the area 65. In the present embodiment, the position at which the inspection image 60A is drawn is moved from one end of the field of view 86 to the other end in the area 65. That is, the laser projection unit 110 projects the moving image data in which the inspection image 60A moves from the left end to the right end of the region 65 onto the retina 22 of the subject.

  In this embodiment, by moving the drawing position of the test image 60A including the fixation index image 90 in this manner, the subject follows the image 90, and the subject's line of sight is moved in the moving direction of the test image 60A. Induce.

  In the state of FIG. 14A, when the position at which the inspection image 60A is drawn is moved from the left end to the right end of the region 65, the direction of the subject's line of sight follows the image 90 of the fixation index. , Go from left to right.

  Then, when the direction of the line of sight of the subject changes, so that the laser beam L emitted from the laser projection unit 110 does not pass through the pupil 25, the state shown in FIG.

  FIG. 14B shows a state in which the laser light L of the laser projection unit 110 has not passed through the pupil 25 because the subject's line of sight has turned to the right following the image 90.

  In the state of FIG. 14B, a part of the inspection image 60A is not projected onto the retina of the subject, and thus, in the visual field 87 at this time, a part of the inspection image 60A including the fixation index image 90 is It is no longer visible.

  When the visual field visual inspection apparatus 100A of the present embodiment is in the state of FIG. 14B, the laser projection unit 110 is moved in the direction in which the inspection image 60A (the fixation index image 90) moves. The laser projection unit 110 is translated.

  FIG. 14C shows a state in which the laser projection unit 110 has been translated. In this state, the laser light L emitted from the laser projection unit 110 again passes through the pupil 25 of the subject. Therefore, in the state shown in FIG. 14C, the inspection image 60A can be visually recognized in the visual field 88 of the subject.

  When the position is moved by the drive unit 160, the laser projection unit 110 moves the drawing position of the inspection image 60A again.

  That is, in the present embodiment, when the examination is started, the laser projection unit 110 moves the drawing position of the examination image 60A in a direction in which the subject's line of sight is guided. When the drawing position of the inspection image 60A moves to a predetermined position, the laser projection unit 110 moves in parallel in the moving direction of the drawing position.

  By repeating this operation, the laser projection unit 110 of the present embodiment can be used as an inspection target up to a region other than the macula of the retina 22 of the subject.

  Further, in the present embodiment, since the gaze of the subject is guided by moving the fixation index, the gaze of the subject can be guided using, for example, an image indicating interest of the subject as the fixation index. Therefore, according to the present embodiment, the test can be performed without making the test subject aware that the test is being performed. This is useful particularly when the test subject is an infant or the like.

  In the present embodiment, the pattern for drawing the inspection image 60A at the drawing position may be stored in the storage unit 140 in advance.

  Hereinafter, the function of the control unit 130B of the present embodiment will be described with reference to FIG. FIG. 15 is a diagram illustrating functions of a control unit according to the third embodiment.

  The control unit 130B of the present embodiment includes a position determination unit 132, a projection control unit 133A, a pattern storage unit 134A, and a drive control unit 136.

  The projection control unit 133A projects inspection image data indicating the inspection image 60A onto the retina 22 of the subject according to the pattern information stored in the pattern storage unit 134A. Specifically, the projection control unit 133A projects the inspection image data onto the retina 22 with reference to the pattern information so that the drawing position of the inspection image 60A moves in the visual field of the subject.

  The pattern storage unit 134A holds pattern information indicating how to move the drawing position of the inspection image 60A.

  For example, the pattern information of the present embodiment is obtained by moving the drawing position of the inspection image 60A from the right to the left, moving the laser projecting unit 110 to the right, and then moving the drawing position from the right to the left. The information indicates a series of flows in the inspection, such as moving the drawing position from left to right, and then moving the laser projection unit 110 from left to right.

  Further, the pattern information of the present embodiment may include information indicating a moving distance when the laser projecting unit 110 is moved in parallel.

  The drive control unit 136 according to the present embodiment may control the drive unit 160 to move the laser projection unit 110 by a predetermined movement distance in the pattern information.

  Next, with reference to FIG. 16, an operation of the visual field visual inspection apparatus 100A of the present embodiment will be described. FIG. 16 is a flowchart illustrating the operation of the visual field visual inspection apparatus according to the third embodiment.

  The control unit 130B of the visual acuity inspection apparatus 100 according to the present embodiment causes the laser projection unit 110 to emit a reference laser beam, and the position determination unit 132 determines the initial position of the laser projection unit 110 (step S1601).

  Note that, in the present embodiment, the position of the laser projection unit 110 when the subject receives an operation indicating that the image projected by the reference laser beam has been visually recognized may be set as the initial position. Further, in the present embodiment, the image 90 of the fixation index may be an image projected by the reference laser beam.

  Subsequently, the control unit 130B refers to the pattern information stored in the pattern storage unit 134A by the projection control unit 133A (step S1602).

  Subsequently, the control unit 130B moves the drawing position of the inspection image 60A by the projection control unit 133A according to the pattern information, controls the drive unit 160 by the drive control unit 136, and controls the laser projection unit 110. The position is changed (step S1603).

  Subsequently, the control unit 130B determines whether or not the inspection has been completed (Step S1604). Specifically, the control unit 130B may determine that the inspection ends when the projection control unit 133A and the drive control unit 136A perform all the operations indicated in the pattern information.

  If the inspection has not been completed in step S1604, the control unit 130B returns to step S1602.

  When the inspection is completed in step S1604, the control unit 130B returns the laser projection unit 110 to the initial position (step S1605), and ends the processing.

As described above, in the present embodiment, since the visual field test and the visual acuity test are performed while moving the fixation index and guiding the gaze of the subject, the configuration of the imaging unit and the like for detecting the gaze of the subject becomes unnecessary. In addition, simplification of the apparatus can be realized. Furthermore, in the present embodiment, the subject does not need to keep his / her gaze in one direction, and the burden on the subject can be reduced.
(Modification)
Hereinafter, a modified example of the laser projection unit 110 will be described with reference to FIG. 17, and a modified example of how to attach the imaging unit 180 will be described with reference to FIG. 18.

  FIG. 17 is a diagram illustrating a modification of the laser projection unit. FIG. 17A shows a first modification of the laser projection unit 110, and FIG. 17B shows a second modification of the laser projection unit 110.

  In the laser projection unit 110A shown in FIG. 17A, the scanning unit 114 scans the laser light emitted from the light source 111. The laser light scanned by the scanning unit 114 is reflected by the projection mirror 171 and is irradiated on the retina 22 of the subject.

  In the laser projection unit 110A of FIG. 17A, the direction of the laser beam applied to the eyeball 20 may be changed by rotating the projection mirror 171 instead of moving the entire laser projection unit 110A.

  In the laser projection unit 110B shown in FIG. 17B, the laser light emitted from the light source 111 is reflected by the half mirror 172 and enters the scanning unit 114. The laser light scanned by the scanning unit 114 is applied to the subject's retina 22 via the condenser lens 173.

  In the laser projection unit 110B of FIG. 17B, the direction of the laser beam applied to the eyeball 20 may be changed by rotating the scanning unit 114 instead of moving the entire laser projection unit 110B.

  FIG. 18 is a diagram illustrating attachment of the imaging unit. FIG. 18A is a diagram illustrating a first example of how to attach an imaging unit, and FIG. 18B is a diagram illustrating a second example of how to attach an imaging unit.

  In the example illustrated in FIG. 18A, the imaging unit 180 is provided near the laser projection unit 110. Note that, in the example of FIG. 1, the imaging unit 180 is provided below the image projection unit 107 (laser projection unit 110), but is not limited thereto. The imaging unit 180 may be arranged on the side of the laser projection unit 110 as shown in FIG.

  In FIG. 18B, instead of the imaging unit 180, laser irradiation units 180-1 and 180-2 that irradiate invisible light may be arranged as pupil position detection units.

  In this case, each of the laser irradiators 180-1 and 180-2 may irradiate an invisible ray to the eyeball 20 of the subject, and detect the position of the pupil 25 according to the reflected light from the iris 26.

(Fourth embodiment)
Hereinafter, a fourth embodiment will be described with reference to the drawings. The fourth embodiment is different from the first embodiment in that the visual acuity inspection apparatus 100 and a scanning laser ophthalmoscope (SLO) are combined. Therefore, in the following fourth embodiment, differences from the first embodiment will be described, and those having the same functional configuration as the first embodiment will be used in the description of the first embodiment. The same reference numerals are given to the same reference numerals, and the description thereof will be omitted.

  FIG. 19 is a diagram illustrating a laser irradiation unit according to the fourth embodiment.

  The laser projection unit 110C of the present embodiment has a light source 111, an adjustment unit 112, and an optical system 113. Further, the laser projection unit 110C of the present embodiment includes a detector 190, a half mirror 161, a lens 162, a spectroscope 163, and an infrared optical system 195. The infrared light optical system 195 includes a scanning unit 151, a plane mirror 152, a lens 153, and a combining unit 154.

  In the laser projection unit 110C, the laser light L emitted from the light source 111 is split into a visible laser light La of red laser light, a green laser light, and a blue laser light and an infrared laser light Lb in a spectroscope 163. You. The spectroscope 163 is, for example, a dichroic mirror that transmits the visible laser light La and reflects the infrared laser light Lb. The spectroscope 163 is not limited to a dichroic mirror, but may be another optical element such as a dichroic prism.

  Since the visible laser light La transmitted through the spectroscope 163 is visible light, a fixation index for fixing the line of sight of the subject can be projected.

  On the other hand, the infrared laser light Lb is reflected by the plane mirror 152, and is scanned two-dimensionally by the scanning unit 151. The scanned infrared laser beam Lb irradiates the eyeball 20 of the subject via the lens 153, the combining unit 154, and the lens 117. The infrared laser light Lb converges near the crystalline lens 21, passes through the vitreous body 23, and irradiates the retina 22. The infrared laser light Lb is reflected by the retina 22.

  The reflected infrared laser light Lb returns along the optical path where the infrared laser light Lb has advanced toward the retina 22. In other words, the reflected infrared laser light Lb travels toward the retina 22 in the order of the lens 117, the combining unit 154, the lens 153, the scanning unit 151, the plane mirror 152, and the spectroscope 163. , And enters the detector 190 via the half mirror 161 and the lens 162.

  Thus, the detector 190 detects the infrared laser light Lb that is two-dimensionally scanned by the scanning unit 151 and reflected by the retina 22. The state of the fundus of the eyeball 20 can be detected (obtainment of fundus state information) based on the detection result of the luminance change of the infrared laser light Lb by the detector 190, and the two-dimensional fundus can be detected as an example of the detection target. Images can be acquired. The scanning unit 151 is relatively low, such as 12.5 kHz, which corresponds to a case where an image of 25 frames is projected per second, so that the state of the fundus of the eyeball 20 can be detected by the infrared laser light Lb. Vibrates at a frequency.

  This infrared laser light Lb is projected while scanning on the retina in order to obtain a two-dimensional fundus image. However, since it is invisible light, the subject visually recognizes the infrared laser light Lb. And a fundus image can be obtained.

  It should be noted that, even when acquiring a two-dimensional image of the fundus, it may not be possible to project the infrared laser beam Lb from the pupil onto the retina in the direction of the line of sight of the subject.

  In that case, the fixation target is projected by visible light at the position where the fundus image is desired to be acquired. Then, by moving the infrared light optical system 195 in accordance with the movement of the eyeball 20 in the same manner as the laser projection unit 110, the infrared laser light Lb can be projected onto the retina without being interrupted by the iris. Can be stably acquired.

  As described above, in the present embodiment, by combining the scanning laser ophthalmoscope with the visual acuity test apparatus 100, it is possible to detect the state of the fundus in addition to the visual field test and the visual acuity test.

  In each of the above-described embodiments, the visual field visual inspection device is described as a stationary type, but is not limited to this.

  The visual field visual inspection device may be, for example, a spectacle type. In the case of a spectacle type, an image projection unit including a laser projection unit and a driving unit, and an imaging unit may be attached to the vine portion of the spectacles.

  Further, in each of the above-described embodiments, the image projected on the retina 22 of the subject is used as the inspection image, and the visual field inspection and the visual acuity inspection are performed. However, the present invention is not limited to this.

  For example, each embodiment may be applied to an application that always projects a predetermined image on a specific position of the retina. For example, if a specific position in the field of view of a person driving a moving object such as an automobile or an airplane is to always project an image indicating the moving speed of the moving object, a glasses-type retinal scanning image What is necessary is just to move the laser irradiation part of a projection apparatus according to the position of a pupil of a user. This example is merely an example, and the above-described embodiments can be applied to any retinal scanning type image projection apparatus.

  As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the requirements described here, such as the configuration described in the above embodiments and combinations with other elements. Regarding these points, it is possible to change the scope of the present invention without departing from the spirit thereof, and it can be appropriately determined according to the application form.

100, 100A Visual acuity inspection apparatus 110, 110A, 110B, 110C Laser projection unit 120 Communication unit 130, 130A, 130B Control unit 131 Imaging control unit 132 Position determination unit 133 Projection control unit 134 Image processing unit 135 Rotation angle calculation unit 135A Move Amount calculation unit 136 Drive control unit 140 Storage unit 150 Laser output control unit 160 Drive unit 170 Operation unit 180 Imaging unit

Claims (13)

A light source that emits a light beam, a scanning mirror that scans the light beam to generate an inspection image light beam, and a laser projection unit that projects the inspection image light beam onto the subject's retina as an inspection image,
A drive unit for moving the laser projection unit,
A gaze direction detection unit that detects the gaze direction of the subject,
A visual acuity inspection apparatus comprising: a control unit configured to move the laser projection unit according to the line-of-sight direction in the driving unit. The control unit includes:
The visual acuity inspection apparatus according to claim 1, wherein the laser projection unit is moved by the driving unit such that an irradiation position of the light beam is in a line of sight of the subject. The control unit includes:
The visual field visual acuity inspection apparatus according to claim 1, wherein the drive unit moves the laser projection unit in a direction in which the subject turns his or her line of sight. The gaze direction detection unit is an imaging device,
The control unit includes:
The visual field visual acuity inspection apparatus according to any one of claims 1 to 3, wherein a gaze direction of the subject is detected based on image data captured by the imaging apparatus. The gaze direction detection unit,
The visual field visual acuity inspection apparatus according to any one of claims 1 to 3, wherein a gaze direction of the subject is detected based on a movement of a muscle of a face of the subject. A laser having a light source that emits a light beam and a scanning mirror that scans the light beam to generate an image light beam for inspection, and projects the image light beam for inspection onto the retina of a subject as an inspection image including a fixation index. A projection unit;
A drive unit for moving the laser projection unit,
A visual acuity inspection apparatus comprising: a control unit configured to move the laser projection unit in a direction in which the fixation target moves in the driving unit. The control unit includes:
In the laser projection unit,
7. The visual acuity inspection apparatus according to claim 6, wherein a drawing position of the inspection image including the fixation index is changed in a projection area corresponding to the visual field of the subject. The control unit includes:
8. The visual acuity test according to claim 7, wherein when the fixation index is outside the projection area, the drive unit moves the laser projection unit in a direction in which the fixation index moves. apparatus. The control unit includes:
The storage unit according to any one of claims 1 to 8, further comprising: a storage unit configured to store inspection image data indicating the inspection image and information indicating a result of the subject visually recognizing the inspection image. Visual acuity testing device. The light source is a light source that emits visible light and invisible light,
The image light for inspection is visible light,
An irradiation unit that scans the invisible light, and irradiates the invisible light to the subject's retina,
Having a detector for detecting the invisible light reflected from the retina of the subject,
The control unit includes:
The visual acuity inspection apparatus according to any one of claims 1 to 9, wherein a state of a fundus of the subject is detected from an output signal of the detector. The light source is a light source that emits visible light and invisible light,
The control unit includes:
The visual field visual acuity inspection apparatus according to claim 2, wherein the laser projection unit is moved based on an axial length of the subject detected by irradiating the invisible light beam to the retina of the subject. A visual acuity test method using a visual acuity test device,
Procedure and drive of projecting the inspection image light beam as an inspection image onto a subject's retina by a laser projection unit having a light source that emits a light beam, and a scanning mirror that scans the light beam to generate an inspection image light beam. Moving the laser projection unit by the unit;
A gaze direction detection unit detects a gaze direction of the subject,
Moving the laser projection unit to the drive unit according to the line of sight by the control unit. A visual acuity test method using a visual acuity test device,
A light source that emits a light beam, and a scanning mirror that scans the light beam to generate an image light beam for inspection, by a laser projection unit, the image light beam for inspection as a test image including a fixation index on the subject's retina. Projecting,
A procedure for moving the laser projection unit by a driving unit,
A step of causing the control section to move the laser projection section in a direction in which the fixation index moves to the drive section.