JP2022142637A - Visual field evaluation device - Google Patents

Abstract

To evaluate a visual field, according to characteristics of a subject.SOLUTION: A visual field evaluation device comprises: a display part; a view point detecting part; a display control part for setting a position on the display part where the view point of the subject is detected, to a reference position, and displaying the index on the position on the display part separated from the reference position; and an evaluating part form, when the view point of the subject is moved to the display position of the index, evaluating that, the index display position is included in a visible area of the subject having the reference position as a center of the area, and when the view point of the subject is not moved to the display position of the index, evaluating that, the index display position is not included in the visible area. When continuously performing multiple times, display and evaluation of the index, the display control part displays the index in a first mode in which, difficulty of visual recognition by the subject is greater than that in a previous time, in the case of the evaluation indicating that, the index is included in the previous time, and displays the index in a second mode in which, the difficulty of visual recognition by the subject is lower than that in the previous time, in the case of the evaluation indicating that, the index is not included in the previous time.SELECTED DRAWING: Figure 2

Description

The present invention relates to a visual field evaluation device.

2. Description of the Related Art There is known a visual field evaluation device that displays an index on a display unit, detects the line of sight of a subject, and evaluates the visual field of the subject based on the detection result (see, for example, Patent Document 1).

Japanese Patent No. 6606264

When performing evaluation using the visual field evaluation apparatus as described above, characteristics such as sensitivity to indices and response speed may differ from subject to subject. Therefore, it is required to evaluate the visual field according to the subject's characteristics.

The present invention has been made in view of the above, and an object of the present invention is to provide a visual field evaluation apparatus capable of evaluating a visual field according to the characteristics of a subject.

A visual field evaluation apparatus according to the present invention includes a display unit, a viewpoint detection unit that detects a position of a viewpoint of a subject on the display unit, and a position on the display unit where the viewpoint of the subject is detected as a reference position, a display control unit that displays an index at a position on the display unit that is away from the reference position; Evaluation is made that the display position of the indicator is not included in the visible area when the subject's viewpoint has not moved to the display position of the indicator. and an evaluation unit that performs the display of the index and the evaluation a plurality of times in succession, the display control unit determines that the display position of the index is included in the visible region in the previous evaluation. In this case, when the indicator is displayed in the first mode, which is more difficult for the subject to recognize than the previous evaluation, and the display position of the indicator is evaluated as not included in the visible region in the previous evaluation, The index is displayed in a second mode in which the degree of visual recognition difficulty is lower than that of the previous time.

ADVANTAGE OF THE INVENTION According to this invention, the visual field evaluation apparatus which can evaluate a visual field according to a test subject's characteristic can be provided.

FIG. 1 is a diagram showing an example of a visual field evaluation device according to this embodiment. FIG. 2 is a functional block diagram showing an example of the visual field evaluation device. FIG. 3 is a diagram showing an example of display contents on a display unit. FIG. 4 is a diagram showing an example of display contents on the display unit. FIG. 5 is a diagram showing an example of display contents on the display unit. FIG. 6 is a diagram showing an example of display contents on the display unit. FIG. 7 is a diagram illustrating an example of display content on a display unit; FIG. 8 is a diagram showing an example of display contents on the display unit. FIG. 9 is a diagram showing an example of display contents on the display unit. FIG. 10 is a diagram showing an example of display contents on the display unit. FIG. 11 is a diagram illustrating an example of display content on a display unit; FIG. 12 is a flowchart showing an example of the visual field evaluation method according to this embodiment. FIG. 13 is a diagram showing an example of display contents on the display unit in the modified example.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a visual field evaluation device according to the present invention will be described below with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, components in the following embodiments include components that can be easily replaced by those skilled in the art, or components that are substantially the same.

FIG. 1 is a diagram showing an example of a visual field evaluation device 100 according to this embodiment. The visual field evaluation apparatus 100 shown in FIG. 1 detects the line of sight of the subject and uses the detection result to evaluate the visual field of the subject. The visual field evaluation apparatus 100 uses various methods such as a method of detecting the line of sight based on the position of the subject's pupil and the position of the corneal reflection image, or a method of detecting the line of sight based on the position of the inner corner of the eye and the position of the iris of the subject. The line of sight of the subject can be detected by the method of

As shown in FIG. 1 , the visual field evaluation device 100 includes a display device 10 , an eyeball photographing device 20 and a control device 30 .

Display device 10 includes a flat panel display such as a liquid crystal display (LCD) or an organic electroluminescence display (OLED). In this embodiment, the display device 10 has a display section 11 . The display unit 11 displays information such as images. The display device 10 may be a head-mounted display device. When the display device 10 is a head-mounted display device, a configuration such as the eyeball photographing device 20 is arranged in the head-mounted module.

The eyeball photographing device 20 photographs the right and left eyeballs EB of the subject, acquires eyeball images, and transmits the acquired eyeball images to the control device 30 . The eyeball photographing device 20 acquires image data by photographing the left and right eyeballs EB of the subject. The eyeball photographing device 20 has various cameras according to the method of detecting the line of sight of the subject. For example, in the case of a system that detects the line of sight based on the position of the subject's pupil and the position of the corneal reflection image, the eyeball photographing device 20 has an infrared camera and can transmit near-infrared light with a wavelength of 850 [nm], for example. and an imaging device capable of receiving the near-infrared light. In addition, in this configuration, a configuration in which an irradiation device for irradiating infrared rays to the subject's eyeball EB may be provided. Further, for example, in the case of a system that detects the line of sight based on the position of the inner corner of the eye and the position of the iris of the subject, the eyeball photographing device 20 has a visible light camera. The eyeball photographing device 20 outputs a frame synchronization signal. The period of the frame synchronization signal can be, for example, 20 [msec], but is not limited to this. The eyeball photographing device 20 can have, for example, a configuration of a stereo camera having two cameras, but is not limited to this.

The control device 30 centrally controls the operation of the visual field evaluation device 100 . The control device 30 includes an arithmetic processing device such as a CPU (central processing unit), and a memory such as a ROM (read only memory) and a RAM (random access memory) or a storage device. In the control device 30, the arithmetic processing device performs arithmetic processing according to a computer program stored in the storage device.

The visual field evaluation device 100 according to this embodiment is a device in which the display device 10 and the control device 30 are separate devices. Note that the display device 10 and the control device 30 may be integrated. For example, the visual field evaluation device 100 may include a tablet personal computer. In this case, the tablet personal computer may be equipped with a display device, an eyeball photographing device, a computer system, an input device, an output device, and the like.

FIG. 2 is a functional block diagram showing an example of the visual field evaluation device 100. As shown in FIG. As shown in FIG. 2 , the control device 30 has a display control section 31 , a viewpoint detection section 32 , a determination section 33 , a calculation section 34 , an evaluation section 35 and a storage section 36 .

The display control unit 31 causes the display unit 11 to display an index for the subject to gaze at. The display control unit 31 can control and display the brightness of the index in a plurality of stages. The display control unit 31 may be capable of controlling the size of the indicator and the display time for displaying the indicator in multiple stages.

The display control unit 31 sets the position on the display unit 11 where the subject's viewpoint is detected as a reference position, and displays the index at a position on the display unit 11 away from the reference position. The display control unit 31 displays the index at an appropriate position when evaluating the subject's visual field. The display control unit 31 may calculate an appropriate position based on evaluation information that has been measured in the past and stored in the storage unit 36, for example.

When measuring continuously, the display control unit 31 sets a new reference position at which the subject's viewpoint is detected on the display unit 11 after the evaluation unit 35 performs the previous evaluation. When the display position of the index is evaluated to be included in the visible region in the previous evaluation, the display control unit 31 displays the index in the first mode, which is more difficult for the subject to recognize than in the previous evaluation. Further, when the display position of the index is evaluated as not included in the visible region in the previous evaluation, the display control unit 31 displays the index in the second mode, which is less difficult for the subject to recognize than in the previous evaluation. Let

Here, the visual recognition difficulty indicates the degree of difficulty of visual recognition when the subject has the reference position as the center of the visual field. For example, the farther the display position of the indicator is from the reference position, the lower the brightness of the indicator, the smaller the size of the indicator, and the shorter the display time of the indicator, the higher the visibility difficulty. Conversely, the closer the display position of the index is to the reference position, the higher the brightness of the index, the larger the size of the index, and the longer the display time of the index, the lower the visibility difficulty.

Therefore, the first mode includes, for example, a mode in which the indicator is displayed at a position where the distance between the reference position and the display position of the indicator is longer than that in the previous time, a mode in which the brightness of the indicator is displayed at a lower level than in the previous time, Examples include a mode in which the indicator is displayed in a smaller size compared to the immediately preceding time, and a mode in which the indicator is displayed for a shorter display time than the previous time.

The second mode includes, for example, a mode in which the indicator is displayed at a position where the distance between the reference position and the display position of the indicator is shorter than that in the previous time, a mode in which the brightness of the indicator is increased compared to the previous time, Examples include a mode in which the size of the indicator is displayed larger than that of the previous time, and a mode in which the indicator is displayed for a longer time than that of the previous time.

In addition, in the first mode, the index is displayed so that the degree of difficulty in recognizing the index increases as the degree of difficulty in recognizing the index in the immediately preceding session increases or as the time required for the subject’s viewpoint to reach the display position of the index in the immediately preceding session increases. It may be a mode to make it. For example, as a first aspect, the display control unit 31 can display the index at a position farther from the reference position or display the index with a lower luminance as the luminance of the index in the previous time is lower. In addition, as a first aspect, the display control unit 31 displays the index at a position farther from the reference position or lowers the brightness as the time required for the subject's viewpoint to reach the display position of the index is shorter in the previous time. You can display the index as follows.

The viewpoint detection unit 32 detects the position of the subject's viewpoint. In this embodiment, the viewpoint detection unit 32 detects the subject's line-of-sight vector defined by the three-dimensional global coordinate system based on the images of the subject's left and right eyeballs EB acquired by the eyeball photographing device 20 . The viewpoint detection unit 32 detects the position of the intersection between the detected line-of-sight vector of the subject and the display unit 11 of the display device 10 as the position of the viewpoint of the subject. That is, in the present embodiment, the position of the viewpoint is the position of the intersection of the subject's line-of-sight vector defined by the three-dimensional global coordinate system and the display unit 11 of the display device 10 . The viewpoint detection unit 32 detects the position of the subject's viewpoint at each prescribed sampling period. This sampling period can be, for example, the period of the frame synchronization signal output from the eyeball photographing device 20 (for example, every 20 [msec]).

The determination unit 33 determines whether or not the viewpoint exists in the determination region corresponding to the index based on the position of the viewpoint during the period when the indicator is displayed by the display control unit 31, and outputs the determination result. The determination area is, for example, an area including the index, and can be set along the outline of the index. The determination unit 33 determines whether or not the viewpoint exists in the determination region at each predetermined determination cycle. The determination period may be, for example, the period of the frame synchronization signal output from the eyeball photographing device 20 (for example, every 20 [msec]). That is, the determination cycle of the determination unit 33 is the same as the sampling cycle of the viewpoint detection unit 32 . The determination unit 33 performs determination on the viewpoint each time the viewpoint detection unit 32 samples the position of the viewpoint, and outputs the determination result.

The calculation unit 34 has a timer that detects the elapsed time after the indicator is displayed on the display unit 11, and a counter that counts the number of determinations made by the determination unit 33 that the gaze point exists in the determination area. For example, when the counter value exceeds a predetermined threshold value, the calculation unit 34 can detect that the subject's viewpoint has moved to the index. Further, the calculation unit 34 can calculate the arrival time from when the index is displayed to when the subject's viewpoint moves to the index, based on the timer.

The evaluation unit 35 evaluates the subject's visible region based on the position of the subject's viewpoint. For example, when the subject's viewpoint moves to the display position of the index, the evaluation unit 35 evaluates that the display position of the index is included in the subject's visible area centered on the reference position. For example, when the subject's viewpoint has not moved to the display position of the index, the evaluation unit 35 evaluates that the display position of the index is not included in the visible region.

The storage unit 36 stores the above determination results and evaluation results. Further, the storage unit 36 sets the position on the display unit 11 where the subject's viewpoint is detected as a reference position, and performs processing for displaying the index at a position on the display unit 11 away from the reference position, and If it moves to the display position, the display position of the index is evaluated as being included in the visible area of the subject centered on the reference position, and if the subject's viewpoint has not moved to the display position of the index, If the display position is evaluated as not included in the visible area, and the display and evaluation of the indicator are performed multiple times in succession, the display position of the indicator was evaluated as being included in the visible area in the previous evaluation. In this case, if the index is displayed in the first mode, which is more difficult for the subject to recognize than the previous evaluation, and the display position of the index is evaluated as not included in the visible area in the previous evaluation, and a visual field evaluation program for causing a computer to execute a process of displaying an index in a second mode with a low visual recognition difficulty.

Next, a visual field evaluation method according to this embodiment will be described. In the visual field evaluation method according to the present embodiment, the visual field of the subject is evaluated using the visual field evaluation apparatus 100 described above.

3 to 11 are diagrams showing examples of display contents on the display unit 11. FIG. As shown in FIG. 3 , the display control unit 31 displays the reference index P so that the subject's viewpoint is directed toward the central portion of the display unit 11, for example. The viewpoint detection unit 32 detects the position of the subject's viewpoint. The determination unit 33 determines whether or not the detected viewpoint of the subject exists in the determination region corresponding to the reference index P. FIG.

When the determination unit 33 determines that the viewpoint exists in the determination area, the display control unit 31 sets the display position (X0, Y0) of the reference index P as the reference position, and as shown in FIG. An index Q is displayed with a predetermined brightness at a position distant from the position of the index P. - 特許庁For example, in the display unit 11, the display control unit 31 controls the first region 11A corresponding to the first quadrant, the second region 11B corresponding to the second quadrant, and the third region 11B corresponding to the third quadrant when the reference position is the origin. The index Q can be displayed by randomly selecting one area from among the four areas of the area 11C and the fourth area 11D corresponding to the fourth quadrant.

The viewpoint detection unit 32 detects the position of the subject's viewpoint. The determination unit 33 determines whether the detected subject's viewpoint exists in the determination region, that is, the region corresponding to the index Q. FIG. The calculation unit 34 calculates the time during which the subject's viewpoint exists in the region corresponding to the index Q based on the determination result. The evaluation unit 35 determines that the subject's viewpoint has moved to the display position of the index Q when the calculated time is equal to or longer than the predetermined time. When the evaluation unit 35 determines that the subject's viewpoint has moved to the display position of the index Q, the evaluation unit 35 evaluates that the display position of the index Q is included in the subject's visible region centered on the reference position. Moreover, the evaluation unit 35 determines that the subject's viewpoint has not moved to the display position of the index Q when the calculated time is less than the predetermined time. When the evaluation unit 35 determines that the subject's viewpoint has not moved to the display position of the index Q, the evaluation unit 35 evaluates that the display position of the index Q is not included in the subject's visible region centered on the reference position. After evaluating the visible region around the reference position, the evaluation unit 35 associates the position of the index Q with the evaluation content and stores them in the storage unit 36 .

When the display and evaluation of the index are continuously performed a plurality of times, the display control unit 31 causes the reference index P to be displayed again in the central portion of the display unit 11, for example. In this case, the display position of the reference index P is not limited to the central portion of the display section 11, and may be another position. The viewpoint detection unit 32 detects the position of the subject's viewpoint. The determination unit 33 determines whether or not the detected viewpoint of the subject exists in the determination region corresponding to the reference index P. FIG.

When the determination unit 33 determines that the viewpoint exists in the determination area, the display control unit 31 displays the index using the display position of the reference index P as the reference position. When the display position of the index Q is evaluated to be included in the visible region in the previous evaluation, the display control unit 31 selects the display control unit 31 as shown in FIG. Display the index Q1. As shown in FIG. 5, the display control unit 31 can display the indicator Q1 at a position where the distance from the reference position is longer than that of the previous time, for example, as a first mode. As in the previous time, when the index Q1 is displayed, one of the four areas (the first area 11A, the second area 11B, the third area 11C, and the fourth area 11D) on the display unit 11 is selected at random. can be selected and displayed. Note that the display control unit 31 may display a new index in a region different from the region in which the index Q was displayed the last time, among the four regions.

Further, when the display position of the index Q is evaluated not to be included in the visible region in the previous evaluation, the display control unit 31 changes the display control unit 31 to the second display having a lower visual recognition difficulty than the previous evaluation, as shown in FIG. 6 . The index Q2 is displayed in two modes. As shown in FIG. 6, the display control unit 31 can display the indicator Q2 at a position where the distance from the reference position is shorter than that of the previous time, for example, as a second mode.

Examples of the first mode and the second mode are not limited to the examples shown in FIGS. For example, as shown in FIG. 7, the display control unit 31 may display an index Q3 whose luminance is lower than that of the previous index Q, for example, as a first mode. In this case, the distance between the reference position and the index Q3 can be the same as the distance between the reference position and the index Q in the previous time.

Further, as shown in FIG. 8, the display control unit 31 may display, as a second mode, an index Q4 with a higher luminance than the index Q of the previous time, for example. In this case, the distance between the reference position and the index Q4 can be the same as the distance between the reference position and the index Q in the previous time.

In addition, as a first mode, the display control unit 31 can display the indicators in a mode in which the higher the visibility difficulty level of the immediately preceding indicator, the higher the visibility difficulty level. FIG. 9 shows an example in which display positions of the indicators Q5, Q6, and Q7 of the immediately preceding time are evaluated to be included in the visible region. As shown in FIG. 9, the display control unit 31 can display the indicators Q8, Q9, and Q10 at positions farther from the reference position as the luminance of the indicators Q5, Q6, and Q7 is lower. For example, the display control unit 31 can display the indicator Q8 at a position with a medium distance from the reference position for the indicator Q5 with medium brightness. In addition, the display control unit 31 can display an index Q9 at a position farther from the reference position than the index Q8 with respect to the index Q6 whose luminance is lower than that of the index Q5. In addition, the display control unit 31 can display the index Q10 at a position closer to the reference position than the index Q8 with respect to the index Q7 whose luminance is higher than that of the index Q5.

In addition, as a first mode, the display control unit 31 can display the index so that the degree of visual recognition difficulty increases as the time taken for the subject's viewpoint to reach the index in the previous time is shorter. For example, as shown in FIG. 10, the calculation unit 34 calculates the time t until the subject's viewpoint reaches the index Q11 in the previous time. When the time t is the time t1 longer than the predetermined threshold, the display control unit 31 displays the indicator Q12 at a position with reference to the reference position. On the other hand, when the time t is a time t2 shorter than the predetermined threshold, the display control unit 31 can display the indicator Q13 at a position farther than the indicator Q12 with respect to the reference position. Note that the display control unit 31 may display the indicator Q13 with a lower brightness than the indicator Q12.

Also, in each of the above descriptions, the case where the reference position is set to the same position as the previous one (the position in the central portion of the display section 11) was taken as an example, but the reference position is not limited to this. For example, as shown in FIG. 11, when the indicator Q14 is displayed with the reference indicator P1 as the reference position in the previous display, the display control unit 31 sets the display position of the indicator Q14 as a new reference position and displays the indicator Q15. You may let In this case, the reference index P2 may be displayed at a newly set reference position.

When the indicators (Q1-Q4, Q8-Q10, Q12, Q13, Q15) are displayed as described above, viewpoint detection is performed in the same way as when the previous indicators (Q, Q5-Q7, Q11, Q14) were displayed. The unit 32 detects the position of the viewpoint of the subject. The determination unit 33 determines whether the detected viewpoint of the subject exists in the determination region, that is, the region corresponding to the index. Based on the determination result, the calculation unit 34 calculates the time during which the subject's viewpoint is present in the area corresponding to the index. When the calculated time is equal to or longer than the predetermined time, the evaluation unit 35 determines that the subject's viewpoint has moved to the display position of the index. When the evaluation unit 35 determines that the subject's viewpoint has moved to the display position of the index, the evaluation unit 35 evaluates that the display position of the index is included in the subject's visible area centered on the reference position. Further, when the calculated time is less than the predetermined time, the evaluation unit 35 determines that the subject's viewpoint has not moved to the display position of the index. When the evaluation unit 35 determines that the subject's viewpoint has not moved to the display position of the index, the evaluation unit 35 evaluates that the display position of the index is not included in the subject's visible area centered on the reference position. After evaluating the visible region around the reference position, the evaluation unit 35 associates the position of the index with the evaluation content and stores them in the storage unit 36 .

After that, when the display position of the index is evaluated to be included in the visible region, the display control unit 31 sets a new reference position, and determines the difficulty of recognition by the subject for the new reference position compared to the index. A new index is displayed in the first mode in which is high. Further, when it is evaluated that the display position of the index is not included in the visible region, the display control unit 31 creates a new reference position in the second mode in which the degree of difficulty of recognition by the subject is lower than that of the index with respect to the new reference position. Show indicators. Then, by making the subject gaze at the new index in the same manner as described above, it is evaluated whether or not the display position of the new index is included in the subject's visible area, and the evaluation result is stored in the storage unit 36 . In this manner, perimeter measurement and evaluation are performed by changing the mode of the next displayed index based on the evaluation contents of the index displayed immediately before.

Information on positions evaluated to be included in the visible region of the subject is accumulated in the storage unit 36 through multiple measurements and evaluations. The evaluation unit 35 may map the visible region of the subject based on the accumulated positional information, and display the mapping result on the display unit 11 or the like. In addition, the storage unit 36 accumulates information on positions evaluated as not included in the visible region of the subject. When the display control unit 31 causes the display unit 11 to display the index, the display control unit 31 controls, among the four regions, the first region 11A to the fourth region 11D, the region corresponding to the position evaluated as not included in the subject's visible region. The random numbers may be weighted so that the number of times the index is displayed increases. In addition, the evaluation unit 35 may generate a database that associates each piece of position information accumulated in the storage unit 36 with incidental information such as the subject's age, sex, occupation, and the like. The evaluation unit 35 may obtain the relationship between the supplementary information of the subject and the evaluation result of the visible region based on the database.

Next, an example of the visual field evaluation method according to this embodiment will be described with reference to FIG. FIG. 12 is a flowchart showing an example of the visual field evaluation method according to this embodiment. In this embodiment, the display control unit 31 sets a position on the display unit 11 where the viewpoint of the subject is detected as a reference position (step S10). The display control unit 31 displays the index with respect to the reference position (step S20).

The viewpoint detection unit 32 detects the position of the subject's viewpoint (step S30). Based on the detected position of the viewpoint, the evaluation unit 35 evaluates whether or not the display position of the index is included in the visible region of the subject centered on the reference position (step S40), and determines the evaluation result as the display position of the index. are stored in the storage unit 36 (step S50). After step S50, if the visual field measurement is finished, the process is finished by skipping subsequent processes (Yes in step S60).

After finishing the measurement of the field of view, the measurement result may be output. As an output form of the measurement result, a method of printing on paper, a method of displaying the result on a display device, or the like can be considered. For example, the measurement person can easily explain the measurement result to the subject by printing the measurement result on paper or displaying it on a display device.

If the visual field measurement is not finished (No in step S60), the display control unit 31 sets the position on the display unit 11 where the subject's viewpoint is detected as a new reference position (step S70). When the display position of the index is evaluated to be included in the visible region in the previous display (Yes in step S80), the display control unit 31 displays the index in the first mode (step S90). On the other hand, if the display position of the index is evaluated not to be included in the visible region in the immediately preceding evaluation (No in step S80), the index is displayed in the second mode (step S100). After step S90 or step S100, the process after step S30 is performed.

As described above, the visual field evaluation apparatus 100 according to the present embodiment includes the display unit 11, the viewpoint detection unit 32 that detects the position of the viewpoint of the subject on the display unit 11, and the display unit 11 that detects the viewpoint of the subject. The display control unit 31 displays the index at a position distant from the reference position, and the display position of the index is centered on the reference position when the viewpoint of the subject moves to the display position of the index. an evaluation unit 35 that evaluates that the display position of the index is included in the visible region of the subject, and evaluates that the display position of the index is not included in the visible region if the subject's viewpoint has not moved to the display position of the index; When the display and evaluation are performed a plurality of times in a row, the display control unit 31 determines that the display position of the index is included in the visible region in the previous evaluation, and the degree of visual recognition difficulty by the subject is higher than in the previous evaluation. When the indicator is displayed in the first mode and the display position of the indicator is evaluated not to be included in the visible region in the previous evaluation, the second indicator is displayed in the second mode, which has a lower degree of visual recognition difficulty than in the previous evaluation. .

According to this configuration, based on the evaluation content of the index displayed on the display unit 11 immediately before, the mode of the next displayed index is changed and displayed on the display unit 11; It becomes possible to evaluate the visual field.

In the visual field evaluation apparatus 100 according to the present embodiment, the first mode is a mode in which the index is displayed at a position where the distance between the reference position and the display position of the marker is longer than the previous time, and the second mode is a mode in which the reference position is displayed. In this mode, the index is displayed at a position where the distance between the display position of the index and the display position of the index is shorter than that of the previous time. According to this configuration, by changing the position of the indicator to be displayed next depending on whether or not the index displayed immediately before is within the visible area, mapping of the visible area can be performed efficiently. can.

In the visual field evaluation apparatus 100 according to the present embodiment, the display control unit 31 controls the brightness of the index to be displayed in a plurality of stages. , and the second mode is a mode in which the index is displayed with a higher luminance than that of the previous time. According to this configuration, by changing the brightness of the index to be displayed next depending on whether or not the index displayed immediately before is within the visible region, mapping of the visible region can be performed with high accuracy. can.

In the visual field evaluation apparatus 100 according to the present embodiment, the display control unit 31 controls the brightness of the index in a plurality of stages and displays it. Including a mode in which the indicator is displayed on the According to this configuration, it is possible to efficiently map the visible region by changing the position of the indicator to be displayed next according to the visibility difficulty of the indicator evaluated to be included in the visible region the last time. can.

In the visual field evaluation apparatus 100 according to the present embodiment, the first aspect includes an aspect in which the index is displayed at a position farther from the reference position as the time required for the subject's viewpoint to reach the index display position is shorter. According to this configuration, by changing the position of the indicator to be displayed next according to the time until the subject's viewpoint reaches the display position of the indicator the last time, mapping of the visible region can be performed efficiently. can be done.

[Modification]
The display distance of the index with respect to the reference position may be determined based on the previous evaluation result on the extended line of the display position of the index with respect to the reference position. FIG. 13 is a diagram showing an example of display contents on the display unit in the modified example. Indices Q21 to Q23 are display examples of indices for evaluating the upward visual field range of the subject. First, in a state in which the index Q21 is displayed at a predetermined distance above the reference position P, it is evaluated whether or not the display position of the index Q21 is included in the visible area. When the display position of the index Q21 is evaluated to be included in the visible region, the next index Q22 is displayed at a position longer in distance from the reference position than the index Q21 on the extended line between the reference position P and the index Q21. When it is determined that the display position of the index Q21 is not included in the visible region, the next index Q22 is displayed at a position shorter in distance from the reference position than the index Q21 on the extension line between the reference position P and the index Q21. . By repeating this several times, the upper visual field range of the subject can be determined. The display position of the index having the longest distance from the reference position among the display positions of the indices evaluated to be included in the visible region is determined as the upward visual field range of the subject.

Indices Q31 to Q33 are display examples of indices for evaluating the subject's left visual field range. First, in a state in which the indicator Q31 is displayed at a predetermined distance to the left of the reference position P, it is evaluated whether or not the display position of the indicator Q31 is included in the visible area. When the display position of the index Q31 is evaluated to be included in the visible region, the next index Q32 is displayed at a position longer in distance from the reference position than the index Q31 on the extended line between the reference position P and the index Q31. If it is determined that the display position of the index Q31 is not included in the visible region, the next index Q32 is displayed at a position shorter in distance from the reference position than the index Q31 on the extension line between the reference position P and the index Q31. . By repeating this several times, the upper visual field range of the subject can be determined. The display position of the index having the longest distance from the reference position among the display positions of the indices evaluated to be included in the visible region is determined as the visual field range in the left direction of the subject.

The visual field range is similarly evaluated for the downward direction and the right direction with respect to the reference position. The visual field range evaluation results may be output numerically, such as degrees in each direction, or the visual field range may be displayed as a diagram using an ellipse or a curved line. Alternatively, a threshold for the visual field range may be set, and whether the visual field range is within the allowable range or out of the allowable range may be output as an evaluation result. For example, by using the visual field test apparatus of the present invention for the visual field test when obtaining a driver's license, an accurate visual field test can be performed in a short time. Inspection of the visual field range is not limited to up, down, left, and right, and oblique directions may be inspected.

The display direction of the index with respect to the reference position, that is, the order of the directions for evaluating the visual field range may be arbitrary, and it is not necessary to display the next index in the same direction as the display direction of the previous index. For example, when evaluating the upward and leftward viewing ranges, it is first evaluated whether or not the display position of the index Q21 in FIG. Next, it evaluates whether or not the display position of the index Q22 or Q23 is included in the visible area based on the evaluation result of the display position of the index Q21, and then evaluates whether or not the display position of the index Q31 is included in the visible region. Whether or not the display position of the index Q32 or the index Q33 is included in the visible area may be displayed based on the evaluation result. In the case of evaluating the upper, lower, left, and right visual field ranges, the evaluation may be performed while changing the direction of evaluation such as up, down, left, right, up, down, left, right.

The technical scope of the present invention is not limited to the above embodiments, and modifications can be made as appropriate without departing from the scope of the present invention.

EB... eyeball, P, P1, P2... reference index, Q, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15... index, 10... display Apparatus 11 Display unit 11A First area 11B Second area 11C Third area 20 Eyeball shooting device 30 Control device 31 Display control unit 32 Viewpoint detection unit 33 Determination unit 34 Calculation unit 35 Evaluation unit 36 Storage unit 100 Visual field evaluation device

Claims (6)

a display unit;
a viewpoint detection unit that detects the position of the subject's viewpoint on the display unit;
a display control unit that sets a position on the display unit where the viewpoint of the subject is detected as a reference position, and displays an index at a position on the display unit that is away from the reference position;
When the viewpoint of the subject moves to the display position of the indicator, the display position of the indicator is evaluated as being included in the visible region of the subject centered on the reference position, and the viewpoint of the subject moves to the display position of the indicator. an evaluation unit that evaluates that the display position of the indicator is not included in the visible area when the indicator has not moved to the display position,
When the display of the index and the evaluation are performed a plurality of times in succession, the display control unit determines that the display position of the index is included in the visible region in the previous evaluation, and When the indicator is displayed in the first mode in which the degree of visual recognition difficulty by the subject is high, and the display position of the indicator is evaluated not to be included in the visible region in the previous evaluation, the display position is compared to the previous evaluation. A visual field evaluation device that displays the index in a second mode with a low visual recognition difficulty. The first mode is a mode in which the indicator is displayed at a position where the distance between the reference position and the display position of the indicator is longer than the previous time,
The visual field evaluation apparatus according to claim 1, wherein the second mode is a mode in which the index is displayed at a position where the distance between the reference position and the display position of the index is shorter than that of the previous time. The display control unit controls and displays the brightness of the index in a plurality of stages,
The first mode is a mode in which the brightness of the indicator is displayed at a lower level than that of the previous time,
The visual field evaluation apparatus according to claim 1 or 2, wherein the second mode is a mode in which the index is displayed with a higher luminance than that of the previous time. The display control unit controls and displays the brightness of the index in a plurality of stages,
The visual field evaluation according to any one of claims 1 to 3, wherein the first aspect includes an aspect in which the index is displayed at a position farther from the reference position as the brightness of the index in the previous time is lower. Device. The first mode includes a mode in which the indicator is displayed at a position farther from the reference position as the time taken for the subject's viewpoint to reach the indicator display position in the immediately preceding cycle is shorter. Item 5. The visual field evaluation device according to any one of Item 4. The display control unit displays the indicator in the first mode or displays the indicator in the first mode based on the most recent evaluation result when the indicator was displayed in the same direction with respect to the reference position, from the past evaluation results. The visual field evaluation device according to any one of claims 1 to 5, which controls whether to display in two modes.

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