JP5141522B2 - Control method for visual field inspection device, visual field inspection device, and head-mounted image display device - Google Patents

Description

  The present invention relates to a control method for a visual field inspection device, a visual field inspection device, and a head-mounted image display device, and more particularly to a control method for a visual field inspection device that performs an inspection while guiding a subject's line of sight, a visual field inspection device, and a head. The present invention relates to a wearable video display device.

  Conventionally, in the visual field inspection, a visual field confirmation pattern having a predetermined pattern is sequentially displayed at a plurality of positions in front of the subject's eyes, and the visual field is measured based on a notification from the subject about whether or not to approve viewing. In such an inspection method, it is important to inspect whether or not the visual field confirmation pattern can be viewed with the subject's line of sight guided to a predetermined position and fixed. That is, it is important to examine how far the periphery can be visually recognized with the subject's line of sight fixed to, for example, the center of the display screen.

  Therefore, various methods for guiding the subject's line of sight to a predetermined position have been studied. For example, by providing a blinking gaze point (gaze pattern) at the center of the screen to guide the subject's line of sight to the gaze point (see Patent Document 1), the subject can use a mouse as a fixed target (gaze pattern) on the screen. There is known a method of guiding a subject's line of sight to a fixed target by performing an operation of moving a cursor using the method (see Patent Document 2).

Further, as shown in FIGS. 8A and 8B, a person (gaze pattern Xp) is displayed at the center of the screen 10D, the subject's line of sight is directed to the person by guidance, and the screen A rectangular striped pattern (field confirmation pattern Yp) is sequentially displayed at random positions. A method is known in which the subject himself / herself measures the field of view according to how far the striped pattern that appears in different places can be visually recognized (see Non-Patent Document 1).
Japanese Patent Laid-Open No. 10-272098 JP 2005-517482 A Pfizer Japan Inc. Homepage, NTG simple self-check (view check), [Search September 19, 2008], Internet <http://www.ntg40.jp/index2.html>

  The methods described in Patent Literature 1, Patent Literature 2, and Non-Patent Literature 1 can all induce the subject's line of sight to the gaze pattern. However, it is unclear whether or not the subject's line of sight was fixed to the gaze pattern when viewing the visual field confirmation pattern. For example, in the case of Non-Patent Document 1, there are cases where attention is paid to the striped pattern appearing in different places and the eyes are unconsciously used. Therefore, there is a problem that the inspection cannot be performed with high accuracy.

  The present invention has been made in view of the above problems, and an object thereof is to provide a control method of a visual field inspection device, a visual field inspection device, and a head-mounted image display device capable of performing inspection with high accuracy. To do.

  The above object is achieved by the invention described in any one of 1 to 9 below.

1. In the control method of the visual field inspection apparatus for displaying the gaze pattern for guiding the visual line of the subject to a predetermined position on the screen and the visual field confirmation pattern for confirming the visual field of the subject on the screen and measuring the visual field of the subject.
The gaze pattern has a plurality of designs,
A display step of displaying the different symbols at predetermined positions on the screen and displaying the visual field confirmation pattern at arbitrary positions on the screen at predetermined time intervals,
When the subject visually recognizes the visual field confirmation pattern, an input step for causing the subject to input information set in advance corresponding to the displayed symbol;
And a determination step of determining the visual field of the subject based on the time from when the input information and the visual field confirmation pattern are displayed to when the information is input, or any of them. Control method for visual field inspection apparatus.

  2. 2. The visual field inspection apparatus according to 1, wherein the display step displays the different symbols at the center of the screen and displays the visual field confirmation pattern at an arbitrary position on the screen at every predetermined time. Control method.

  3. 2. The visual field inspection apparatus according to 1, wherein the display step displays the different symbols on the periphery of the screen and displays the visual field confirmation pattern at an arbitrary position on the screen every predetermined time. Control method.

4). In the visual field inspection apparatus for displaying the gaze pattern for guiding the subject's line of sight to a predetermined position on the screen and the visual field confirmation pattern for confirming the visual field of the subject on the screen and measuring the visual field of the subject.
The gaze pattern has a plurality of designs,
A display unit that displays the different symbols at predetermined positions on the screen at predetermined time intervals and displays the visual field confirmation pattern at arbitrary positions on the screen;
When the subject visually recognizes the visual field confirmation pattern, an input unit that causes the subject to input information set in advance corresponding to the symbol displayed on the display unit;
And a determination unit that determines the visual field of the subject based on the information input at the input unit and the time from when the visual field confirmation pattern is displayed until the information is input. Visual field inspection device characterized by

  5). 5. The visual field inspection apparatus according to 4, wherein the display unit displays the different symbols at the center of the screen at predetermined time intervals and displays the visual field confirmation pattern at an arbitrary position on the screen. .

  6). 5. The visual field inspection apparatus according to 4, wherein the display unit displays the different symbols on the periphery of the screen at predetermined time intervals and displays the visual field confirmation pattern at an arbitrary position on the screen. .

  7). 7. A head-mounted image display device comprising the visual field inspection device according to any one of 4 to 6 and detachably attached to the head or face of the subject.

8). The display unit is disposed in front of the left and right eyes of the subject,
8. The head-mounted image display device according to 7, wherein the gaze pattern and the visual field confirmation pattern are selectively displayed on any of the display units.

  9. 8. The head mounted video display device according to 7, wherein the display unit is movably disposed in front of the left and right eyes of the subject.

  According to the present invention, when the subject visually recognizes the visual field confirmation pattern, the subject is allowed to input information preset in correspondence with the gaze pattern displayed on the screen. That is, the subject is made to perform an operation of inputting information corresponding to the gaze pattern that changes every predetermined time. As a result, the subject cannot shift the line of sight from the gaze pattern, and can fix the line of sight to the gaze pattern.

  Further, the visual field of the subject is determined based on the time from when the information input by the subject and the visual field confirmation pattern are displayed until the information is input. As a result, even if the line of sight is deviated from the gaze pattern, in this case, the line of sight is fixed to the gaze pattern depending on whether the information input by the subject is correct or incorrect and the time until the information is input. It can be determined whether or not. As a result, the accuracy of the inspection can be increased.

  Embodiments of a visual field inspection device, a head-mounted image display device (hereinafter also referred to as HMD), and a control method for the visual field inspection device according to the present invention will be described below with reference to the drawings. In addition, although this invention is demonstrated based on embodiment of illustration, this invention is not limited to this embodiment.

  First, a schematic configuration of the visual field inspection apparatus will be described with reference to FIG. FIG. 1 is a block diagram showing a schematic configuration of the visual field inspection apparatus 1.

  As shown in FIG. 1, the visual field inspection apparatus 1 includes a display unit 10, an input unit 20, a control unit 30, a storage unit 40, a communication unit 50, and the like.

  The display unit 10 is based on an image signal output from the control unit 30 to guide the subject's line of sight to a predetermined position on the screen and a visual field confirmation pattern for confirming the visual field of the subject. , And a visual field confirmation pattern are displayed. The display unit 10 is, for example, a liquid crystal display panel that displays the visual field determination result as a character string or a design.

  FIG. 2 shows a display example of the gaze pattern X and the visual field confirmation pattern Y. The gaze pattern X is displayed at the center of the screen 10D of the display unit 10, and the visual field confirmation pattern Y is blinked at an arbitrary position around it.

  As shown in FIG. 2A to FIG. 2D, the gaze pattern X has a plurality of (here, four types) symbols Xa to Xd, and a different symbol is the center of the screen 10D every predetermined time. And the visual field confirmation pattern Y blinks at an arbitrary position on the screen 10D.

  Note that the gaze pattern X is preferably small enough that the gaze pattern X cannot be identified when the subject looks away. The design and type of the gaze pattern X are not limited to those shown in FIG. The visual field confirmation pattern Y may be changed in size according to the accuracy required for inspection (how small the defect area is), or may be a pattern other than a rectangle or a stripe pattern.

  When the subject visually recognizes the visual field confirmation pattern Y, the input unit 20 obtains information set in advance corresponding to the symbols Xa (Xb, Xc, Xd) of the gaze pattern X displayed on the screen 10D. For example, a keyboard, a cross key, and a pedal.

  FIG. 3 shows an example of correspondence between the gaze pattern X and input information (key 703). As shown in FIGS. 3A to 3D, the arrow key 703a (703b, 703c, 703d) having the same direction as the Δ symbol of the pattern Xa (Xb, Xc, Xd) of the gaze pattern X corresponds. It is attached. The association between the gaze pattern X and the input information (key 703) is stored in the storage unit 40. Also, the association of information (key 703) is not limited to that shown in FIG. Further, when starting the visual field inspection, the control unit 30 displays these associations on the screen 10D and presents “association” to the subject.

  The control unit 30 communicates with a ROM (Read Only Memory) that stores each control program (not shown) provided in the storage unit 40, and a RAM (Random Access Memory) that temporarily stores data such as arithmetic processing and control processing. It is composed of a CPU (Central Processing Unit) that executes a control program read from the ROM. The control unit 30 receives signals from the input unit 20 and various operation switches (not shown), and comprehensively controls display operations and visual field determination operations performed by the visual field inspection apparatus 1.

  Further, the control unit 30 generates image signals related to the gaze pattern X and the visual field confirmation pattern Y, and outputs and displays the image signal. The control unit 30 corresponds to a determination unit in the present invention, and information (key 703) is input after the information (key 703) and the visual field confirmation pattern Y input by the subject through the input unit 20 are displayed on the screen 10D. The field of view of the subject is determined based on the time to be taken or any one of them.

  Here, the flow of the visual field determination operation performed by the control unit 30 will be described with reference to FIGS. 4 and 5. FIG. 4 is a timing chart showing gaze pattern X switching timing, visual field confirmation pattern Y display timing, and information (key 703) input timing. FIG. 5 is a flowchart showing the flow of the visual field determination operation.

  First, at time t1, the control unit 30 sets, for example, a gaze pattern Xa and a visual field confirmation pattern Y (step S1) and displays them on the screen 10D of the display unit 10 (step S2; display process).

  Next, when the subject visually recognizes the visual field confirmation pattern Y, the subject inputs information (key 703) set in advance corresponding to the gaze pattern Xa displayed on the screen 10D (step S3; input process).

  Next, the control unit 30 stores the time twa from when the information (key 703) input by the subject and the visual field confirmation pattern Y are displayed on the screen 10D until the information (key 703) is input, or any of them. The information is stored in the unit 40 (step S4).

  The control unit 30 switches the series of steps to a gaze pattern Xb and a gaze pattern Xc at a predetermined number of times, for example, time t2 and time t3, and switches the display position of the visual field confirmation pattern Y at time t1. Repeat as in the case. The obtained information (input key 703, time twb, time twc) is stored in the storage unit 40 (step S5).

  In this way, when the inspection is completed after a predetermined number of times, the control unit 30 confirms the visual field from the information stored in the storage unit 40 in a state where the gaze of the subject is fixed to the gaze pattern X. It is determined whether or not the pattern Y has been visually recognized (step S6, step S7; determination step). Specifically, for example, when the information input by the subject other than the key 703a associated with the gaze pattern Xa with respect to the gaze pattern Xa displayed at time t1 (key 703b, key 703c, key 703d) When the time twa is longer than the predetermined time, it is highly likely that the subject's line of sight was not fixed to the gaze pattern Xa, so this information input was invalidated, and the visual field confirmation pattern Y was not visible at this time. Judge that it is.

  And finally, the control part 30 displays a determination result on the display part 10 (step S8), and complete | finishes a visual field determination operation | movement.

  Returning to FIG. 1, as described above, the storage unit 40 temporarily stores data such as a ROM (Read Only Memory) that stores each control program (for example, a visual field determination program) (not shown), arithmetic processing, control processing, and the like. It comprises a RAM (Random Access Memory) for storing. The storage unit 40 stores a correspondence between the gaze pattern X and input information (key 703). In addition, the storage unit 40 stores the time tw from when the information (key 703) input by the subject and the visual field confirmation pattern Y are displayed on the screen 10D until the information (key 703) is input, or any of them. .

  The communication unit 50 has, for example, a wireless LAN and is updated with a server or the like provided outside, and records a visual field determination result and the like.

  Thus, in the visual field confirmation device 1 according to the embodiment of the present invention, when the subject visually recognizes the visual field confirmation pattern Y, it corresponds to the pattern of the gaze pattern X displayed on the screen 10D of the display unit 10. It was made for a test subject to input the preset information (key 703). That is, the subject is made to perform an operation of inputting information (key 703) corresponding to the design of the gaze pattern X that changes every predetermined time. As a result, the subject cannot shift the line of sight from the gaze pattern X and can fix the line of sight to the gaze pattern X.

  Further, the visual field of the subject is determined based on time tw from when the information (key 703) input by the subject and the visual field confirmation pattern X are displayed to when the information (key 703) is input or any one thereof. I did it. As a result, even if the line of sight is deviated from the gaze pattern X, in this case, depending on whether the information (key 703) input by the subject is correct or not, the time tw until the information (key 703) is input, etc. It can be determined whether or not the line of sight has been fixed to the gaze pattern X. As a result, the accuracy of the inspection can be increased.

  In the above-described embodiment, the gaze pattern X is displayed at the center of the screen 10D of the display unit 10, but the screen 10D is displayed so that a visual field inspection can be performed in a range higher than the angle of view with respect to the screen 10D. You may make it display on a periphery.

  For example, first, as shown in FIG. 6A, the gaze pattern X is displayed at the left end of the screen 10D and the visual field confirmation pattern Y is displayed at the right end, so that the visual field on the right side of the line of sight of the subject H is maximized. Can measure up to. Next, as shown in FIG. 6B, the gaze pattern X is displayed at the right end of the screen 10D, and the visual field confirmation pattern Y is displayed at the left end, thereby measuring the visual field on the left side of the visual line of the subject H up to the maximum viewing angle β. can do. By summing the left and right viewing angles thus measured, the viewing angle of the subject H can be measured up to a maximum α + β.

  In FIG. 6, the visual field confirmation pattern Y is displayed at the right end and the left end of the screen 10D. However, this is the upper limit that can be measured, and as in the case of the above-described embodiment, an arbitrary screen 10D is displayed. Display at random position. Moreover, although the gaze pattern X is displayed on the left end and the right end of the screen 10D, it may be displayed on the upper end, the lower end, and the opposite corner (corner in the diagonal direction).

  By doing in this way, a visual field inspection in a range higher than the angle of view with respect to the screen 10D can be performed.

  Next, an embodiment of a head-mounted image display device (HMD) provided with the aforementioned visual field inspection device 1 will be described with reference to FIG. FIG. 7A is a perspective view showing the appearance of the HMD 1A.

  The main part of the HMD 1A includes a frame 60, a display unit 10, a control unit 70, and the like.

  The frame 60 is a long member composed of a flexible elastic material or the like, and is hooked on the ear or temporal portion of the wearer (subject) and held on the head of the wearer of the HMD 1A. And for adjusting the mounting position.

  The display unit 10 includes an LCD display unit 101, an eyepiece optical system 102, and the like, and displays an image based on an image signal output from the control unit 70. Moreover, the display part 10 is arrange | positioned at the flame | frame 60 so that it may each be located in front of a test subject's right and left eyes.

  The control unit 70 includes the above-described input unit 20, control unit 30, storage unit 40, communication unit 50, and the like. As the input unit 20, a cross key 703 is provided.

  The HMD 1A having such a configuration is detachably attached to the subject's head and face, and the image obtained from the LCD display unit 101 is projected directly onto the subject's eyeball by the eyepiece optical system 102, so that the image can be obtained. This makes it possible to observe a virtual image as if it was enlarged and projected in the air. And in this embodiment, the display part 10 displays the gaze pattern X and the visual field confirmation pattern Y based on the image signal which concerns on the above-mentioned gaze pattern and visual field confirmation pattern output from the control part unit 70, and is a test subject. To provide.

  In this way, by wearing the HMD 1A, the display unit 10 is arranged in front of the subject's eyes, so that the optimal screen size, the distance between the screen and the eye, etc. are uniquely determined. Thereby, an optimal inspection environment can be easily set without performing troublesome alignment or the like. In addition, the gaze pattern X and the visual field confirmation pattern Y are selectively displayed on either the left or right display unit 10, so that the subject can keep both eyes open without meditating one eye. Can be tested in the correct state.

  In the present embodiment, the display unit 10 has a binocular configuration in which the display unit 10 is arranged in front of the left and right eyes of the subject. However, as shown in FIG. It is good also as the one eye structure arrange | positioned so that movement is possible. In this case, the same effect as in the binocular configuration can be obtained.

It is a block diagram which shows schematic structure of the visual field inspection apparatus which concerns on embodiment of this invention. It is a schematic diagram which shows the example of a display of a gaze pattern and a visual field confirmation pattern. It is a schematic diagram which shows matching of a gaze pattern and an input key. It is a time chart which shows the switching timing of a gaze pattern, the display timing of a visual field confirmation pattern, and the input timing of visual field confirmation. It is a flowchart which shows the flow of a visual field determination operation | movement. It is a schematic diagram which shows the example of a display by another example of a gaze pattern and a visual field confirmation pattern. It is a perspective view which shows the external appearance of HMD which concerns on embodiment of this invention. It is a schematic diagram which shows the example of a display of the conventional gaze pattern and visual field confirmation pattern.

Explanation of symbols

1 Visual field inspection device 1A Head-mounted image display device (HMD)
DESCRIPTION OF SYMBOLS 10 Display part 101 LCD display part 102 Eyepiece optical system 20 Input part 30 Control part (determination part)
40 Storage Unit 50 Communication Unit 70 Control Unit 701 Power Switch 703 Four-way Key H Head X Gaze Pattern Y View Confirmation Pattern

Claims (9)

In the control method of the visual field inspection apparatus for displaying the gaze pattern for guiding the visual line of the subject to a predetermined position on the screen and the visual field confirmation pattern for confirming the visual field of the subject on the screen and measuring the visual field of the subject.
The gaze pattern has a plurality of designs,
A display step of displaying the different symbols at predetermined positions on the screen and displaying the visual field confirmation pattern at arbitrary positions on the screen at predetermined time intervals,
When the subject visually recognizes the visual field confirmation pattern, an input step for causing the subject to input information set in advance corresponding to the displayed symbol;
And a determination step of determining the visual field of the subject based on the time from when the input information and the visual field confirmation pattern are displayed to when the information is input, or any of them. Control method for visual field inspection apparatus. 2. The visual field inspection according to claim 1, wherein the display step displays the different pattern at the center of the screen and displays the visual field confirmation pattern at an arbitrary position of the screen at predetermined time intervals. Control method of the device. 2. The visual field inspection according to claim 1, wherein the display step displays the different symbols on the periphery of the screen at predetermined time intervals and displays the visual field confirmation pattern at an arbitrary position on the screen. Control method of the device. In the visual field inspection apparatus for displaying the gaze pattern for guiding the subject's line of sight to a predetermined position on the screen and the visual field confirmation pattern for confirming the visual field of the subject on the screen and measuring the visual field of the subject.
The gaze pattern has a plurality of designs,
A display unit that displays the different symbols at predetermined positions on the screen at predetermined time intervals and displays the visual field confirmation pattern at arbitrary positions on the screen;
When the subject visually recognizes the visual field confirmation pattern, an input unit that causes the subject to input information set in advance corresponding to the symbol displayed on the display unit;
And a determination unit that determines the visual field of the subject based on the information input at the input unit and the time from when the visual field confirmation pattern is displayed until the information is input. Visual field inspection device characterized by 5. The visual field inspection according to claim 4, wherein the display unit displays the different symbols at the center of the screen and displays the visual field confirmation pattern at an arbitrary position on the screen at predetermined time intervals. apparatus. 5. The visual field inspection according to claim 4, wherein the display unit displays the different symbols on a peripheral edge of the screen and displays the visual field confirmation pattern at an arbitrary position on the screen at predetermined time intervals. apparatus. A head-mounted image display device comprising the visual field inspection device according to claim 4, wherein the visual field inspection device is detachably attached to the head or face of the subject. The display unit is disposed in front of the left and right eyes of the subject,
The head-mounted image display device according to claim 7, wherein the gaze pattern and the visual field confirmation pattern are selectively displayed on any one of the display units. The head-mounted video display device according to claim 7, wherein the display unit is movably disposed in front of the subject's left and right eyes.

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