JP2003000542A - Visual field inspection system and method, and program therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a visual field inspection system and method, with which it is not necessary for a subject to gaze at the fixation point and it is not necessary for the subject to autochthonously answer to a doctor. SOLUTION: This visual field inspection system is provided with a means for presenting an image including the gaze point to the subject, a means for presenting an optotype within the range of a prescribed visual field for the gaze point to the subject, a means for detecting the reaction of the examinee in response to the presentation of the optotype to the subject and a means for generating information showing the range of the visual field of the subject on the basis of the reaction of the a subject.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual field inspection device, a visual field inspection method and a program for inspecting a range of a visual field of a subject.

[0002]

2. Description of the Related Art Human vision tends to be focused on the resolution (visual acuity) of the central part of the visual field (central visual field).
However, the peripheral part of the visual field (peripheral visual field) plays an important role in daily life and driving a car. As a device to inspect whether there is an abnormality in this peripheral visual field,
Various visual field inspection devices have been developed and commercialized.

In order to inspect the peripheral visual field by using the conventional visual field inspection apparatus, the doctor instructs the subject to keep gazing at the fixation point fixed in the visual field inspection apparatus, and the test subject gazes at the fixation point. In this state, the visual field inspection device presents the optotypes around the gazing point, and when the visual target presented around the gazing point is visible, the subject responds by pressing the answer button of the visual field inspection device. It was necessary to take a procedure in which the visual field inspection device records the response from and the visual field inspection device outputs information indicating the range of the visual field of the subject based on the response recorded in the visual field inspection device.

[0004]

In the conventional visual field inspection apparatus, the subject is required to keep gazing at the gazing point.
Therefore, if the subject is a person who is unable to consciously continue to gaze at the point of interest (for example, preschool infants or the elderly), or if the subject does not follow the doctor's instructions, the peripheral visual field is examined. There was a problem that it was difficult to do.

Further, in the peripheral visual field inspection using the conventional visual field inspection apparatus, whether or not the visual target is visible depends on a voluntary response from the subject. For this reason, there is a problem that the test subject can arbitrarily control the test result, and the test result is not reliable.

The present invention has been made in view of the above-mentioned problems, and eliminates the need for the subject to consciously continue to look at the gazing point and the subject to voluntarily respond to the doctor. An object of the present invention is to provide a visual field inspection device, a visual field inspection method, and a program.

[0007]

A visual field inspection apparatus of the present invention is a visual field inspection apparatus for inspecting a range of a visual field of a subject, and means for presenting an image including a gazing point to the subject.
Means for presenting to the subject an optotype within a range of a predetermined visual field with respect to the gazing point, and means for detecting a reaction of the subject in response to presenting the optotype to the subject, Based on the reaction of the subject, a means for generating information indicating the range of the field of view of the subject,
This achieves the object of the present invention.

The visual field inspection apparatus may further include means for presenting to the subject another visual target within a range of a predetermined visual field with respect to the visual target.

A visual field inspection method of the present invention is a visual field inspection method for inspecting a range of a visual field of a subject, which comprises the step of presenting an image including a gaze point to the subject, and a predetermined visual field for the gaze point. Presenting a target within the range to the subject, detecting a reaction of the subject that occurs in response to presenting the target to the subject, and the subject based on the reaction of the subject Generating information indicating the range of the field of view of
This achieves the object of the present invention.

[0012] The visual field inspection method may further include a step of presenting to the subject another visual target within a range of a predetermined visual field with respect to the visual target.

A program of the present invention is a program for causing a computer to execute a visual field inspection process for inspecting a range of a visual field of a subject, wherein the visual field inspection process presents an image including a gazing point to the subject. A step of presenting to the subject an optotype within a range of a predetermined visual field with respect to the gazing point, and a step of detecting a reaction of the subject in response to presenting the optotype to the subject And generating information indicating the range of the visual field of the subject based on the reaction of the subject, whereby the object of the present invention is achieved.

The visual field inspection process may further include the step of presenting to the subject another visual target within a range of a predetermined visual field with respect to the visual target.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the configuration of a visual field inspection device 10 according to an embodiment of the present invention. The visual field inspection device 10 inspects the range of the visual field of the subject 20.

The visual field inspection apparatus 10 includes a display device 11 for displaying an image (gazing point image) 15 including a gazing point, and a visual target (target) 16 within a predetermined visual field range with respect to the gazing point.
The computer 14 that controls the display device 11 to display the display device 11 and the motion detection device 12 that detects the motion (reaction) of the subject 20 that occurs in response to the visual target 16 being displayed on the display device 11.

As the gazing point image 15, an arbitrary image having a property of naturally attracting the subject 20's attention is used. By using the image having such a property, the subject 20 can be relieved from the pain of consciously continuing to look at the fixed point. It does not matter whether the gazing point image 15 is a still image or a moving image. For example, when the subject 20 is a preschooler infant, it is preferable to use a still image or a moving image representing the face of the mother of the subject 20 as the gazing point image 15. Infants unknowingly unconsciously look at their mother's face (especially
This is because there is a tendency to gaze at the mother's eyes). As the gazing point image 15, a moving image representing a moving body (for example, a ball) moving along a predetermined trajectory may be used. This is because the subject 20 tends to track the center of the moving body unconsciously. The gazing point image 15 is displayed in front of the subject 20, for example.

Since the gazing point image 15 has a certain area, strictly speaking, not all the subjects 20 gaze at the same point in the gazing point image 15 as a gazing point. However, depending on the contents of the gazing point image 15, the points in the gazing point image 15 that the subject 20 actually gazes are considerably narrowed down. For example, when the gazing point image 15 is a still image showing a human face, the midpoint of the line segment connecting the eyes of the human may be regarded as the gazing point. Further, when the gazing point image 15 is a moving image showing a moving body moving along a predetermined locus,
The center of the moving body may be regarded as the gazing point.
As described above, depending on the content of the gazing point image 15, the gazing point in the gazing point image 15 (correctly, a specific point in the gazing point image 15 where the subject 20 is expected to have the highest probability of gazing).
The position of can be specified.

The computer 14 displays the target 16 within the range of a predetermined visual field with respect to the gazing point.
Control 1

The movement detecting device 12 detects the movement (reaction) of the subject 20 which occurs in response to the visual target 16 being displayed on the display device 11. The detection result of the motion detection device 12 is output to the computer 14. Subject 20 that occurs in response to the display of the optotype 16 on the display device 11.
When the movement detection device 12 detects the movement (reaction) of the above, it is determined that “the subject 16 can see the visual target 16”, and the determination result is output to the computer 14. Target 16
When the motion detection device 12 does not detect the motion (reaction) of the subject 20 that occurs in response to the display on the display device 11, it is determined that "the subject 20 did not see the visual target 16". The judgment result is output to the computer 14. Here, the subject 2 is detected by the motion detection device 12.
When any movement (reaction) of 0 is detected, the determination as to whether or not the movement (reaction) has occurred in response to the display of the optotype 16 on the display device 11 is performed, for example, This is performed based on whether or not the movement (reaction) has occurred within a predetermined time from the display of the visual target 16 while the subject 20 continues to watch the gazing point image 15 for a predetermined time or longer. Here, whether or not the subject 20 continues to watch the gazing point image 15 for a predetermined time or more can also be detected by the motion detection device 12.

The computer 14 tells the subject 20 that the target 1
Information indicating the range of the visual field of the subject 20 is generated based on the determination result of whether 6 is visible or not. For example, “subject 2
When it is determined that the target 16 is visible at 0, it is determined that the relative position of the target 16 with respect to the gazing point is within the range of the visual field of the subject 20, and If it is determined that the target 16 is not visible, it is determined that the relative position of the visual target 16 to the gazing point is outside the visual field of the subject 20. The computer 14 outputs information indicating the range of the visual field of the subject 20 to the output device 13. The output device 13 may be, for example, the subject 2 in the form of a visual field recording chart.
Information indicating the range of the field of view of 0 is output. Output device 13
Can be any output device. The output device 13 may be, for example, a printer or a display (monitor).

FIG. 2 shows an example of a visual field recording chart.
Such a visual field recording chart can be printed on paper by an output device or displayed on a screen.

The visual field recording chart has relative coordinates with the origin of the position of the gazing point image 15. Longitude (0 to 360 degrees) is defined along the direction of arrow A (counterclockwise rotation), and latitude (0 to 90 degrees) is defined along the direction of arrow B (radiation direction). .

When it is determined that "the subject 16 can see the visual target 16", points indicating the relative position of the visual target 16 to the gazing point are plotted on the visual field recording chart.
When it is determined that “the subject 16 did not see the optotype 16”, points indicating the relative position of the optotype 16 with respect to the gazing point are not plotted on the visual field recording chart. A plurality of points can be plotted on the visual field recording chart by sequentially determining "whether the target 16 was seen by the subject 20" while sequentially changing the relative position of the target 16 to the gazing point. . By observing the range of points plotted on the visual field recording chart, the doctor
It is possible to determine the range of the field of view of 0.

When the visual target 17 is displayed next to the visual target 16 on the display device 11, the visual target 17 is displayed within a predetermined visual field range with respect to the visual target 16, and the Mark 17
Whether to plot a point indicating the relative position of the optotype 17 with respect to the optotype 16 on the visual field recording chart may be determined according to the determination result of "whether or not" was seen.
When it is determined that “the subject 20 can see the visual target 17”, a point indicating the relative position of the visual target 17 with respect to the visual target 16 is plotted on the visual field recording chart with the position of the visual target 16 as the origin. Will be done. In this way, the visual field inspection is continued without returning the line of sight of the subject 20 to the gazing point image 15 by sequentially changing the position that is the origin of the relative coordinates each time the visual target is displayed on the display device 11. It will be possible. This reduces the time required for the visual field inspection.

In the example shown in FIG. 1, the display device 11 is
It has three wall surfaces as a display surface. However, the display device 11 is not limited to this type of display device.
As the display device 11, any wide-view type display device that covers at least the range of the visual field of the subject 20 can be used.

An example of such a wide-field type display device is a device sold by Nissho Electronics (product name: CAVE). For details of CAVE, refer to the URL "http: //www.tradep".
ia. or. jp / nevc / advanced / vr
/ Cave / cave. See the "html" web page. Another example of the wide-field type display device is a device (product name: Vision Station) sold by Elumens. Vi
For details of the sessionStation, refer to the URL "http:
// www. virtual-reality. com
/ Products / visionstation. h
See the "tml" web page.

Examples of the movement (reaction) of the subject 20 detected by the movement detecting device 12 include movement of the eyeball and movement of the head. However, the subject 20 to be detected
The movement (reaction) of is not limited to these. As for the movement (reaction) of the subject 20 to be detected, the optotype 16 is displayed on the display device 1.
It can be any type of movement (reaction) as long as the movement (reaction) occurs in response to being displayed in 1. As the motion detection device 12, any type of detection device that detects the movement of the eyeball, or any type of detection device that detects the movement of the head can be used.

As an example of a detection device of the type that detects the movement of the eyeball, there is a device sold by Nac Image Technology (product name: EMR series). For details on the EMR series, see the URL "http: /
/ Www. camnac. co. jp / analysi
s / analysis-index. See the "html" web page.

An example of a detection device of the type that detects the movement of the head is a device sold by Advanced Systems (product name: POLARIS).
For more information on POLARIS, see the URL "http: // n
s. asco. co. jp / asco / product
s / polaris. See the "html" web page. As another example of the detection device of the type that detects the movement of the head, there is a device (product name: Vicon series) sold by Nac Image Technology. For details on the Vicon series, see the URL "http
p: // www. camnac. co. jp / anal
ysis / analysis-index. html "
Please refer to the web page of.

Alternatively, as the motion detecting device 12, CC
A D camera or an infrared camera may be used. Image processing of signals output from a CCD camera or an infrared video camera makes it possible to detect eye movements and head movements. For example, the movement of the eyeball can be detected by using image processing to determine the position of the black eye in the white eye. For example, the movement of the head can be detected by using image processing to determine the area of the skin color occupying the area of the head.

In addition to controlling the position at which the optotype 16 is displayed, the computer 14 controls the attributes (lightness, saturation, hue, size, display time) of the optotype 16 displayed on the display device 11. Etc.) may be controlled. For example, the computer 14 may control the attribute of the optotype 16 by changing the value of the parameter corresponding to the attribute of the optotype 16. This makes it possible to perform an interactive visual field inspection.

In the example shown in FIG. 1, the computer 14
The display device 11 and the display device 11 function as “means for presenting an image including a gazing point to a subject”, and the computer 14 and the display device 11 “tell the subject a target within a predetermined visual field with respect to the gazing point”. The motion detection apparatus 12 functions as "a means for detecting a reaction of the subject that occurs in response to the presentation of the visual target to the subject", and the computer 14 "based on the reaction of the subject. Function as a means for generating information indicating the range of the visual field of the subject ".

Further, when the visual target 17 is displayed next to the visual target 16 on the display device 11, the computer 14 and the display device 11 "display another visual target within the range of a predetermined visual field with respect to the visual target." Function as a means for presenting the target to the subject ”.

The example shown in FIG. 1 is merely an example of the functional division of the visual field inspection apparatus of the present invention. A visual field inspection device having any configuration may be included in the scope of the present invention as long as the functions of the respective means described above are achieved. For example,
The function of each unit described above may be realized by hardware, software, or hardware and software.

FIG. 3 shows an example of the internal configuration of the computer 14. The computer 14 includes a CPU 21, a memory 22, an interface 23 for the display device 11, an interface 24 for the motion detection device 12, and an interface 25 for the output device 13. The respective components included in the computer 14 are connected to each other via a bus 26.

The memory 22 stores a program for causing the computer 14 to execute a visual field inspection process (hereinafter referred to as a visual field inspection process program). The visual field inspection processing program may be stored in the memory 22 in advance when the computer 14 is shipped.

Alternatively, after shipping the computer 14,
The visual field inspection processing program may be stored in the memory 22. For example, the user may download the visual field inspection processing program from a specific website on the Internet for a fee or free of charge, and install the downloaded program in the computer 14. When the visual field inspection processing program is recorded in a computer-readable recording medium such as a flexible disk, a CD-ROM, a DVD-ROM,
The visual field inspection processing program may be installed in the computer 14 using an input device (for example, a disk drive device). The installed program is stored in the memory 22.

In the memory 22, the data for displaying the gazing point image 15 on the display device 11 and the visual target 16 are displayed on the display device 1.
1 and data to be displayed in 1 are also stored.

FIG. 4 shows the procedure of the visual field inspection process. Execution of the visual field inspection process is controlled by the CPU 21 (FIG. 3). Hereinafter, each step of the visual field inspection process will be described in detail.

Step S1: The CPU 21 uses the memory 22
The data of the gazing point image 15 stored in is displayed on the display device 11 via the display device interface 23.
As a result, the gazing point image 15 is displayed on the display device 11.

Step S2: The CPU 21 uses the memory 22
The data of the optotype 16 stored in the display device 11 is output to the display device 11 via the display device interface 23. As a result, the visual target within the range of the predetermined visual field with respect to the gazing point is displayed on the display device 11.

Step S3: The motion detecting device 12 detects the reaction of the subject 20 in response to the display of the optotype 16 on the display device 11. The detection result of the motion detection device 12 is output to the CPU 21 via the motion detection device interface 24.

Step S4: The CPU 21 generates information indicating the range of the visual field of the subject 20 according to the detection result of the motion detecting device 12. For example, when the motion detecting device 12 detects the reaction of the subject 20 that “the target 16 is visible”, the CPU 21 uses the information indicating the range of the visual field of the subject 20 as a relative value of the target 16 to the gazing point. The position information indicating the target position is generated, and the position information is stored in the memory 22. The CPU 21 outputs the position information stored in the memory 22 to the output device interface 25.
To the output device 13 via. As a result, points indicating the relative position of the optotype 16 with respect to the gazing point are plotted on the visual field recording chart.

Step S5: The CPU 21 determines whether or not to continue the visual field inspection. If the determination result of step S5 is “Yes”, the visual field inspection process is step S2.
Returning to, if the determination result of step S5 is "No", the visual field inspection process ends.

In this way, steps S2 to S4 are repeated until the visual field inspection processing is performed for all the directions subject to the visual field inspection.

Thus, according to the visual field inspection device 10,
An image having the property of naturally attracting the attention of the subject 20 is used as the gazing point image 15. This eliminates the need for the doctor to give the subject 20 an instruction for the visual field inspection, and the subject 20 does not need to consciously continue to look at the fixed gazing point. As a result, it becomes possible to easily perform a visual field test of a preschool infant or an elderly person, which has been difficult with a conventional test using a visual field test apparatus. For the same reason, it becomes possible to perform a visual field test on animals.

It can be said that the state in which the subject 20 naturally attracts the attention is a state close to daily life, such as a state of driving a car or chasing a ball. Performing a visual field test in a state close to daily life is very useful for pointing out the danger in daily life.

Further, according to the visual field inspection device 10, the test subject 20 that occurs in response to the presentation of the visual target to the test subject 20.
Is detected, and information indicating the range of the visual field of the subject 20 is generated based on the reaction of the subject 20. This eliminates the need for the subject 20 to voluntarily reply whether or not the visual target was visible. As a result, it becomes possible for the subject 20 to avoid arbitrarily controlling the test results.

Further, the visual target 1 displayed on the display device 11
6 attributes (brightness, saturation, hue, size, display time, etc.)
Interactively controlling the subject 20
It is possible to perform a visual field inspection according to the situation. It is possible to perform visual field tests similar to or better than conventional visual field tests such as screening, glaucoma, central vision, peripheral vision, semi-blindness, and color vision.

[0050]

According to the present invention, the visual field inspection device, the visual field inspection method, and the visual field inspection method which make it unnecessary for the test subject to keep consciously watching the gazing point and for the test subject to voluntarily respond to the doctor, It becomes possible to provide the program.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a configuration of a visual field inspection device 10 according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a visual field recording chart.

FIG. 3 is a diagram showing an example of an internal configuration of a computer 14.

FIG. 4 is a diagram showing a procedure of a visual field inspection process.

[Explanation of symbols]

10 Visual field inspection device 11 Display 12 Motion detection device 13 Output device 14 Computer 15 gazing point image 16 optotypes 20 subjects

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kotaro Minato             23 Kuroya-cho, Sakyo-ku, Kyoto-shi, Kyoto Prefecture (72) Inventor Kunihiro Chihara             14-20-406 Koriencho, Hirakata City, Osaka Prefecture (72) Inventor Kei Nagata             4-5-19 Sakuragaoka, Kusatsu City, Shiga Prefecture

Claims (6)

[Claims] 1. A visual field inspection device for inspecting a range of a visual field of a subject, which presents an image including a gazing point to the subject, and an optotype within a range of a predetermined visual field with respect to the gazing point. Means for presenting to the subject, means for detecting a reaction of the subject that occurs in response to presenting the visual target to the subject, and showing a range of the visual field of the subject based on the reaction of the subject. A visual field inspection apparatus comprising: means for generating information. 2. The visual field inspection apparatus according to claim 1, wherein the visual field inspection apparatus further comprises means for presenting to the subject another visual target within a range of a predetermined visual field with respect to the visual target. apparatus. 3. A visual field inspection method for inspecting a range of a visual field of a subject, which comprises the step of presenting an image including a gazing point to the subject, and an optotype within a range of a predetermined visual field with respect to the gazing point. Is presented to the subject, a step of detecting a reaction of the subject occurring in response to the presentation of the visual target to the subject, and a range of the visual field of the subject are shown based on the reaction of the subject. A visual field inspection method, the method comprising: generating information. 4. The visual field inspection method according to claim 3, further comprising the step of presenting to the subject another visual target within a range of a predetermined visual field with respect to the visual target. . 5. A program for causing a computer to execute a visual field inspection process for inspecting a range of a visual field of a subject, wherein the visual field inspection process presents an image including a gazing point to the subject, Presenting a target within the range of a predetermined visual field to the viewpoint to the subject, detecting a reaction of the subject that occurs in response to presenting the target to the subject, the subject Generating information indicating the range of the visual field of the subject based on the reaction of. 6. The program according to claim 5, wherein the visual field inspection process further includes a step of presenting to the subject another visual target within a range of a predetermined visual field with respect to the visual target.