JPH08266466A - Visual field measuring apparatus - Google Patents

Abstract

PURPOSE: To enable measuring of a visual field while detecting that a person to be inspected is watching a point of notice exactly. CONSTITUTION: When a person to be inspected watches a point of notice on a light spot projection surface 2, the visual axis of the person to be inspected is detected by a visual axis input means 3 to be shown on a display 5. An inspecting person measures a visual field while checking the visual axis of the person to be inspected captures the point P of notice exactly by viewing the display 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual field measuring device used for measuring the visual field of a subject in hospital ophthalmology or the like.

[0002]

2. Description of the Related Art Conventionally, a normal visual field measuring device for measuring a visual field of a subject has a hemispherical light spot projection surface for covering the visual field of the subject and a light for projecting a light spot on the light spot projection surface. Point projection means,
And a device for fixing the position of the eye of the subject. A gazing point is drawn in front of the subject's eye on the light spot projection surface, and the subject always looks at the gazing point. The examiner projects a light spot on the light spot projection surface to control the position of the light spot, and the subject responds by pressing a button when the light spot is seen. With the examinee gazing at the gazing point,
The examiner measures the visual field of the subject by moving the light spot into the visual field from various directions outside the visual field, and sequentially plotting the positions where the subject responded that the subject was seen.

On the other hand, a video camera, a silver salt camera, etc. are equipped with a line-of-sight input means, which is arranged immediately in front of the subject's eyes to detect in which direction the subject is looking. It can be measured. That is, with this line-of-sight input means, infrared rays are projected onto the eye of the subject to form an infrared CCD.
The rotation angle of the eyeball is estimated by capturing an image with a camera and measuring which part of the eye the pupil is from the captured image. The rotation angle of the eyeball at this time represents the line-of-sight direction of the subject.

[0004]

[Problems to be Solved by the Invention]

(1) However, since the above-mentioned conventional visual field measuring device is not equipped with the line-of-sight input means, it is not possible for the examiner to confirm whether the subject is looking at the gazing point set by the visual field measuring device. This is difficult, and there is a problem that the subject must always measure the visual field while continuously looking at this gazing point.

(2) Further, since the position of the next light spot can be predicted to some extent, there is a case where the user has a field of view centered on a position deviated from the set gazing point in the field of view measuring apparatus without knowing,
Since it is necessary to repeat the measurement at the same location many times each time, it takes a lot of trouble and time, and it is difficult to improve the measurement accuracy, and it is possible to perform automatic visual field measurement only by the subject without the examiner. There is a problem that you cannot do it.

The first object of the present invention is to solve the above-mentioned problem (1).
The object of the present invention is to provide a visual field measuring device capable of confirming that the subject is surely looking at the gazing point.

The second object of the present invention is to solve the above-mentioned problem (2).
It is an object of the present invention to provide a visual field measurement device capable of controlling the position of a light spot to be projected based on the line of sight of the subject.

The third object of the present invention is the above-mentioned problem (2).
It is an object of the present invention to provide a visual field measuring device capable of performing automatic visual field measurement that does not require an examiner.

[0009]

A visual field measuring apparatus according to a first aspect of the present invention for achieving the above object is a visual field measuring apparatus for measuring a visual field of a subject, wherein a visual field measuring apparatus is provided between an eye to be examined and a projection surface. A line-of-sight input means for detecting the line of sight of the examiner is provided.

A visual field measuring device according to a second aspect of the present invention is a visual field measuring device having a visual axis inputting means between an eye to be examined and a projection surface, wherein the output from the visual axis inputting means is fed back to the light spot projecting means to be examined. It is characterized by further comprising control means for controlling the light spot projection means so that the projected light spot is detected at a predetermined position within the visual field of the subject regardless of the direction of the line of sight of the person.

A visual field measuring apparatus according to a third aspect of the present invention is a visual field measuring apparatus for controlling the projection position of a light spot based on the line-of-sight direction of a subject detected by the line-of-sight input means, and the output from the line-of-sight input means It is characterized in that it has a control means for controlling the projection of the light spot based on the relationship with the output from the response means for the examiner to transmit his / her will.

[0012]

In the visual field measuring apparatus of the first invention having the above-mentioned structure, the line-of-sight input means is arranged between the subject and the projection surface, and the subject is looking at the gazing point on the projection surface. Perform visual field measurement while checking.

The visual field measuring apparatus of the second invention detects that the subject is looking at the gazing point on the projection surface by means of the line-of-sight input means, feeds this information back to the light spot projection means, and the line-of-sight of the subject is detected. The visual field is measured such that the light spot is always detected at a predetermined position within the visual field of the subject regardless of the direction in which the visual point is facing.

The visual field measuring apparatus of the third invention processes the output from the line-of-sight input means and the response output of the subject, and controls the projection of the light spot based on this information to automatically perform visual field measurement. .

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 shows a configuration diagram of the first embodiment, in which the position of the eye E to be inspected is fixed by applying it to the front surface of the eye E to be inspected,
An eye-shielding tool 1 that is applied to an eye not to be inspected and shields the field of view is arranged, and a line-of-sight input means 3 that detects the line of sight of the subject is arranged between the eye E and the light spot projection surface 2. Has been done.
The light spot is projected from the light spot projection means 4 onto the light spot projection surface 2, and the output of the line-of-sight input means 3 is connected to the display 5.

When the examinee is gazing at the gazing point P on the light spot projection plane 2, this line of sight is detected by the line-of-sight input means 3 and displayed on the display 5. The examiner looks at the display 5 and confirms that the subject's line of sight is looking at the gazing point P.

FIG. 2 shows the configuration of the second embodiment. The output of the line-of-sight input means 3 is connected to the information processing means 6, and the output of the information processing means 6 is connected to the light spot projection means 4.

When the line of sight of the subject moves, the line-of-sight input means 3 detects it, and this information is sent to the information processing means 6. The information processing means 6 determines the projection direction of the light spot projection means 4 from two pieces of information, that is, the direction of the line of sight and the position in the visual field of the subject to be detected. Control.

FIG. 3 shows a block circuit configuration diagram of the third embodiment, in which a CPU 7 is used as the information processing means 6 of FIG. 2, and the output of the line-of-sight input means 3 and a push button switch 8 to which the subject responds. Is connected to the CPU 7, and the output of the CPU 7 is connected to the light spot projection means 4, the memory 9 and the printer 10.

The CPU 7 receives inputs from the line-of-sight input means 3 and the push button switch 8 for transmitting the intention of the subject, and the memory 9
Is used to control the light spot projection means 4 so that the light spot is projected at the position obtained by the calculation. When the measurement is completed, the result is output from the printer as a chart.

FIG. 4 shows a flow chart of the third embodiment. Step 1: When the measurement is started, the direction in which the visual field measurement is performed is determined.

Step 2: Determine the position on the locus of the light spot within the visual field that gradually moves from the outside to the inside of the visual field along the determined direction.

Step 3: The position of the light spot projected on the light spot projection plane 2 is calculated from the determined position of the light spot in the visual field and the information of the line-of-sight direction of the subject from the line-of-sight input means 3. .
The light spot projection means 4 is controlled based on the calculation result.

Step 4: The subject notifies the light spot with the push button switch 8 when the light spot is seen, and when the push button switch 8 is not pressed, the process returns to step 2 and the light spot is projected at the slightly shifted position. When the push button switch 8 is pressed, the visual field measurement in the measurement direction is finished and the next measurement is performed.

Step 5: If all the measurements are completed, the result is output to the printer 10, otherwise, the procedure returns to Step 1 to perform the measurement in the next direction.

In the above embodiment, the subject's response was made by the push button switch 8. However, a line-of-sight switch for detecting the subject's intentional blinking may be used, or the subject may respond by voice. May be. Further, although the measurement result is output as a chart, it can be electronically recorded by using a chart using an optical card or the like.

[0027]

As described above, in the visual field measuring apparatus according to the first aspect of the present invention, the examiner can measure the visual field by disposing the visual line input means between the eye of the subject and the projection surface. It is possible to easily confirm whether or not the gazing point set in the device is viewed.

The visual field measuring device according to the second aspect of the invention controls the projection of the light spot based on the information from the line-of-sight input means, so that the subject can always see the gazing point set in the visual field measuring device. It is not necessary to perform the measurement, and it is possible to avoid an erroneous determination that the user has a visual field centered on a portion deviated from the gazing point set in the visual field measuring device without knowing it. Furthermore, since it is not necessary to measure the same location many times, it is possible to reduce the labor and time required for the visual field measurement.

The visual field measuring apparatus according to the third aspect of the present invention controls the projection of the light spot based on the relationship between the output of the line-of-sight input means and the response output of the subject, so that the examiner is required for the visual field measurement. Instead, the automatic measurement can be performed only by the subject.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a configuration diagram of a second embodiment.

FIG. 3 is a block circuit configuration diagram of a third embodiment.

FIG. 4 is a flow chart diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Eye shield 2 Light spot projection surface 3 Line-of-sight input means 4 Light spot projection means 5 Display 6 Information processing means 7 CPU 8 Push button switch 9 Memory 10 Printer

Claims (3)

[Claims] 1. A visual field measuring device for measuring a visual field of a subject, characterized by comprising line-of-sight input means for detecting a visual line of the subject between an eye to be examined and a projection surface. 2. A visual field measuring device having a line-of-sight input means between an eye to be inspected and a projection surface, wherein the output from the line-of-sight input means is fed back to the light spot projection means, regardless of the direction of the line of sight of the subject. A field-of-view measuring device having a control means for controlling the light-point projecting means so that the projected light spot is detected at a predetermined position in the visual field of the subject. 3. A visual field measuring device for controlling the projection position of a light spot based on the line-of-sight direction of the subject detected by the line-of-sight input means, and a response in which the output from the line-of-sight input means and the subject transmit their intentions. A field-of-view measuring device comprising control means for controlling the projection of the light spot based on the relationship with the output from the means.