JPH0966026A - Visual acuity inspecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform a change from an inspection for the long distance to an inspection for short distance by providing a reflecting member for reflecting the light flux of an inspecting target for long distance and guiding it to the eye to be inspected and a means for moving a display to be position with which an examinee can directly observe a target for an inspection for short distance in a prescribed distance. SOLUTION: A CRT display 4, on which various inspection targets are displayed on various kinds of information are displayed corresponding to the inspecting distance, is loaded through a rotary arm 8 onto a side table 9. The rotary arm 8 can be horizontally rotated with a shaft 8a as a center and with this rotation, the display 4 can be set from the prescribed inspection position for long distance to the check position for short distance. Besides, a reflection mirror 6 is provided for the examinee to observe the target on the display 4 when the display 4 is set at the inspecting position for long distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual acuity test apparatus for displaying a test target for a visual acuity test.

[0002]

2. Description of the Related Art As a device for presenting an examination target for examining the visual acuity of an eye to be examined, a device for sequentially presenting one or a plurality of targets is known. Such a device is a CRT that can electrically change the type and size of the visual target.
There are also those that use a display such as a liquid crystal.

Further, the test targets include test targets such as a distance test target and a near test target having different test distances. The distance test target and the near test target are respectively tested. Are placed at positions separated by the inspection distance of.

[0004]

However, in the conventional device, it is necessary to prepare two presenting devices, that is, a device for presenting the distance test target and a device for presenting the near test target. In the progress process of the examination, a complicated operation is required to shift from the far vision examination to the near vision examination, and the examination cannot be smoothly performed.

The present invention has been devised in view of the above-mentioned prior art, and the first technical problem is a visual acuity that enables a smooth transition from a distance inspection to a near inspection (and vice versa). To provide an inspection device.

Secondly, it is a technical object to provide a visual acuity test apparatus having a compact and simple structure capable of performing both a distance vision test and a near vision test.

[0007]

[Means for Solving the Problems]

(1) A display for displaying an inspection optotype, display control means for controlling the display to switch between the distance inspection optotype and the near vision inspection optotype, and selecting an optotype to be displayed on the display. An optotype selecting means, a reflecting member for reflecting the light flux of the distance vision test target displayed on the display to guide the eye to the eye to secure a predetermined distance vision test distance, and a subject for near vision test vision. A moving means for moving the display to a position where the target can be directly observed at a predetermined near vision inspection distance.

(2) The moving means of (1) is a placing table on which the display is placed and a placing table moving means for placing the display surface of the display in front of the subject at the time of near vision inspection. Characterize.

(3) The visual acuity testing device according to (2) is characterized by further comprising adjusting means for adjusting the angle or height of the display surface of the display.

(4) The moving means of (1) is a supporting means for rotatably supporting the display.

(5) The visual acuity test apparatus according to (1) is characterized by further comprising a detection means for detecting the moving position of the display.

(6) The visual acuity test apparatus according to (5) determines whether the test target to be displayed is the distance test target or the near test target based on the detection by the detection means. It is characterized in that it comprises an index determining means.

(7) The moving means of (1) is characterized in that it comprises an instructing means for instructing movement and a driving means for driving based on the instructing means.

(8) The visual acuity test apparatus according to (1) is characterized by further including an optometry table and a storage means for storing the display in the optometry table.

(9) In the visual acuity test apparatus of (1), the image pickup means for picking up the face of the subject, the image storage means for storing the picked-up image, and the stored image are combined and displayed. An image synthesizing circuit is provided, and the captured image is displayed on the display.

(10) The display of (1) is characterized in that it is connected to a computer and is commonly used as a terminal display of the computer.

[0017]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an external view of a combination of the visual acuity test apparatus of the embodiment and an optometry table. Reference numeral 1 denotes an optometry table arranged between examinees, and the optometry table 1 includes a side table 9 having a large number of drawers on the examiner side. Reference numeral 4 is a CRT display that displays various inspection targets and various information according to the inspection distance. As the display 4, in addition to CRT, LCD
(Liquid crystal) display, plasma display, LED
A variety of (light emitting diode) displays and the like can be used. The display 4 is mounted on the side table 9 via a rotating arm 8. The rotating arm 8 is rotatable in the horizontal direction about the axis 8a, and by this rotation, the display 4 can be set from a predetermined distance inspection position to a near inspection position (described later). Reference numeral 6 is a reflection mirror for allowing the subject to observe the optotype on the display 4 when the display 4 is set at the distance inspection position (position in FIG. 1). Reference numeral 7 denotes a TV camera provided on the display 4, which can photograph the face and the like of the subject.

Reference numeral 2 denotes a subjective refracting power measuring device in which various optical elements are switched and arranged in an examination window. The subjective refracting power measuring device 2 is supported by a support member 2a and is moved away from the optometry table 1 at the measuring position and retracted. It is suspended and supported so as to be pivotable to and from the position. Reference numeral 3 denotes an objective-type refractive power measuring device, and the objective-type refractive power measuring device 3 is placed on a movable tray that can slide on the optometry table 1.

Reference numeral 5 is a controller provided with various operation switches for switching the optical system of the subjective refractive power measuring device 2 and for switching the visual target displayed on the display 4. In addition,
In the apparatus of the embodiment, since the objective refracting power measuring device 3 is mounted on the optometry table 1, the rotating arm having the display 4 mounted thereon.
The frame 8 is provided on the side table 9, but it may be provided on the main body of the optometry table 1.

FIG. 2 is a principal block diagram showing the control system of the apparatus. The switch signal of the controller 5 is input to the storage / control circuit 10 after being subjected to predetermined processing. The memory / control circuit 10 sends a signal relating to the refractive power to the subjective refractive power measuring device 2 and a signal relating to the visual target to the computer 11. The computer 11 controls the display on the display 4. By storing predetermined display software in the memory circuit of the computer 11 in advance, the computer 1
Reference numeral 1 displays various types of optotypes on the display 4 based on signals relating to the optotypes.

Further, the computer 11 has a TV camera 7
The image data captured by the TV camera 7 is stored after being subjected to a predetermined process. The captured image is called up and displayed on the display 4. 1
Reference numerals 3 and 14 are the keyboard and the mouse of the computer 11.

A position detecting device 15 detects the position of the rotating arm 8 and detects the state or position of the display 4 from the position of the rotating arm 8. The detection signal from the position detecting device 15 is sent to the computer 11 via the memory / control circuit 10.
Is input to

The operation of the apparatus having the above configuration will be described. At the distance inspection, as shown in FIG. 3A, the display 4 is positioned on the side table 9 and the display surface is directed to the reflection mirror 6 side. The reflection mirror 6 secures a distance from the subject 20 positioned with the optometry table 1 in between to the display surface of the display 4 as a predetermined examination distance (for example, 5 m). Since the display 4 is not located in front of the subject, it does not disturb the examination. The number of reflection mirrors is not limited to one, and a plurality of reflection mirrors may be provided.

When the display 4 is placed on the side table 9, the signal from the position detecting device 15 detects that the display 4 is at the distance inspection position. Based on this signal, a predetermined distance test target is displayed on the display 4. The target on the screen at this time is the reflection mirror-6.
Since it is presented to the subject via the screen, the image is displayed in left-right reversal display (see FIG. 1). The examiner switches the test target by operating the target selection switch of the controller 5 or the like to perform the visual acuity test.

For the correction test of the distance inspection distance using the subjective refractive power measuring device 2, the subjective refractive power measuring device 2 is swung by the support member 2a, and the test window is positioned in front of the eye to be examined. The inspection is performed by operating the controller 5 to drive the subjective refractive power measuring device 2 and switching the visual target on the display 4. The tilt of the reflection mirror 6 and / or the display 4 is adjusted according to the height of the subjective refractive power measuring device 2.

The following is performed when the near vision inspection is performed.
The display 4 is moved to the state shown in FIG.
The examiner holds the display 4 or the rotation arm 8 by hand, and rotates the display 4 or the rotation arm 8 around the axis 8a.
Rotate horizontally. The rotation of the rotation arm 8 is limited at a predetermined rotation position by a limiting mechanism (not shown) so that the display surface of the display 4 is at a predetermined near vision inspection position. After that, the horizontal rotation adjustment of the display 4 itself and the tilt adjustment for turning the screen upward are performed, and the display surface is directed toward the eye to be inspected.

The position detecting device 15 detects the rotational position of the rotary arm 8 and detects that the display 4 has been positioned at the near vision inspection position. Storage / control circuit 1 by detection signal
0 determines the switching from the far vision to the near vision, and the discrimination signal is sent to the computer 11. The computer 11 switches the display on the display 4 to a normal rotation target for near vision inspection.

In this way, the examiner can easily switch the display 4 from the far-inspection inspection state to the near-inspection inspection state in front of the subject without moving the measurement location. The inspection distance between the display 4 and the subject is not limited to a predetermined inspection distance, but may be 30 cm depending on the rotation position of the rotation arm 8.
It is possible to continuously change from a short distance of about 1 m to a middle distance of about 1 m, and it is possible to perform not only near inspection but also medium distance inspection. The inspection distance is obtained based on the signal from the position detection device 15, and the computer 11 controls the size of the optotype to be displayed to present the optotype corresponding to the inspection distance.

Although the display 4 is manually moved together with the rotary arm 8 in the embodiment, it may be electrically driven by a motor or the like. The controller 5 is provided with a switch for distance / near use, and when changing the inspection distance, the switch is operated. The device rotationally drives the rotary arm 8 and switches the visual target display on the display 4 by the switch signal.

Further, if the display 4 itself is rotated and tilted electrically, the operator's operation can be further simplified. When the measurement is performed by the objective refracting power measuring device 3, the display 4 is placed on the side table 9. The objective refracting power measuring device 3 can be slid to the measurement position on the optometry table 1 together with the moving tray, and the examiner can perform the measurement without any trouble.

The above description has been centered on the operation when the visual acuity test is performed by the display 4, but the display 4 can be used not only as a target presentation but also as various display devices. When the display 4 is used for purposes other than presenting the optotypes, the display is switched by operating the keyboard 13 (or mouse 14).

For example, when the display 4 is connected to a host computer and is used as a display of a customer database, each device is arranged as shown in FIG. The display 4 is positioned on the side table 9 and the screen is oriented in front of the examiner. The keyboard 13 and the like can be operated by pulling out the drawer of the side table 9 and mounting it.

When presenting the display screen of the display 4 to the subject, such as when providing information on a sale to the subject, the display 4 is moved along with the rotary arm 8 to display the display surface. To face the subject.

Further, by mounting the TV camera 7 on the display 4, the face of the subject can be photographed, the photographed image can be fetched and stored in the memory circuit, and the image can be displayed on the display 4. Display 4 at this time
Is set at the front position of the subject as shown in FIG. The image taken by the TV camera 7 is computer 11
By being processed by, for example, it can be used as a frame selector for comparing wearing states when selecting a spectacle frame, and can be used for eyepoint measurement for measuring the position state of the left and right eyes with respect to the spectacle frame. it can. In the eye point measurement, the center of the eye displayed on the display 4 is point-clicked by operating the mouse 14 so that the computer 11 stores the point in the memory circuit and performs predetermined arithmetic processing to perform measurement.

In the above embodiment, the controller 5 used at the time of the visual acuity test and the keyboard 1 used for other than this.
The mouse 3 and the mouse 14 are divided according to the intended use, but it is also possible to combine these into one controller.

[0036]

Second Embodiment In the first embodiment, the display is mounted on the rotating arm, and by horizontally rotating the display, switching between the far-vision and near-vision optotype presenting is performed. On the other hand, in the second embodiment, Rotate the display vertically.

FIGS. 5A to 5C are views for explaining the apparatus of the second embodiment, and each drawing shows the main part of the optometry table 1'when viewed from the side. Reference numeral 16 is a display composed of an LCD (liquid crystal), and 17 is an arm for changing the display direction of the display 16 (there are two arms 17, and the display 16 is supported from both sides). Since the configuration of the other devices is basically the same as that of the first embodiment,
Its illustration and description are omitted.

When not used, the display 16 of the second embodiment can be housed in the table surface of the optometry table 1 ', as shown in FIG. 5 (a). Therefore, when the display 16 is not needed, it can be effectively used without narrowing the table surface. When the objective refracting power measuring device 3 shown in the first embodiment is mounted on the optometry table 1'and used, the objective refracting power measuring device 3 is slid to the front of the subject. , Can make measurements.

When performing the near vision test, as shown in FIG. 4B, the display 16 is taken out from the storage part of the optometry table 1'and the display surface is set on the subject side. A near vision target corresponding to a predetermined near vision inspection distance is displayed on the display 16.

When performing the distance inspection, the display 16 is rotated vertically with the support shaft at the upper end of the arm 17 as the center of rotation, and the display surface is moved to the mirror 6 side as shown in FIG. 4 (c). Turn. By operating the switch of the controller (not shown), the distance inspection target is displayed on the display 16, and the subject can see the target on the display 16 via the mirror 6.

Although the present invention has been described above with reference to the first and second embodiments, the present invention is not limited to the description of the embodiments, and various modifications can be made. For example, the switching movement between the distance position / near-distance position of the display that presents the examination target may be a sliding movement in the longitudinal direction of the optometry table or a vertical movement in the vertical direction.
These are also included in the present invention within the scope of the same technical idea.

[0042]

As described above, according to the present invention,
A display-type visual acuity test device for both distance / near use can be realized with a relatively simple configuration, and the distance position / near position can be easily switched without the examiner having to move the measurement location. Further, the display device can be used for various purposes such as a display device for displaying various kinds of information in a near-inspection arrangement and a terminal display device for a host computer.

Furthermore, by combining with an image pickup device, the face of the subject can be picked up and shared as a display. Furthermore, since the display is configured to be housed in the table surface of the optometry table, it can be made compact and easy to use.

[Brief description of drawings]

FIG. 1 is an external view of a combination of a visual acuity test apparatus according to a first embodiment and an optometry table.

FIG. 2 is a block diagram showing a control system of the visual acuity test apparatus according to the first embodiment.

FIG. 3 is a layout view of the visual acuity test apparatus according to the first embodiment at the time of distance and near vision inspection.

FIG. 4 is a layout view of each device when a customer database is used.

FIG. 5 is a layout view of the visual acuity test apparatus according to the second embodiment during each test.

[Explanation of symbols]

 1 Optometry table 4 Display 6 Reflection mirror 8 Rotating arm 10 Memory / control circuit 11 Computer 17 Arm

Claims (10)

[Claims] 1. A display for displaying a test target, display control means for controlling the display to switch between a distance test target and a near test target, and a target for display on the display. A target selecting unit for selecting, a reflecting member that reflects the light flux of the distance inspection target displayed on the display and guides it to the eye to ensure a predetermined distance inspection distance, and the subject performs near vision inspection. A visual acuity test apparatus, comprising: a moving unit that moves the display to a position where the target is directly observed at a predetermined near vision inspection distance. 2. The moving means of claim 1 is a mounting table on which the display is mounted, and a mounting table moving means for disposing the display surface of the display in front of the subject at the time of near vision inspection. Eyesight test device. 3. The visual acuity test apparatus according to claim 2, further comprising adjusting means for adjusting an angle or a height of a display surface of the display. 4. The visual acuity test apparatus according to claim 1, wherein the moving unit is a supporting unit that rotatably supports the display. 5. The visual acuity test apparatus according to claim 1, further comprising a detection unit that detects a moving position of the display. 6. The visual acuity test apparatus according to claim 5, wherein the visual acuity test device determines whether the displayed visual test target is a distance visual test target or a near visual test target on the basis of detection by the detection means. A visual acuity test device comprising a mark determination means. 7. The visual acuity test apparatus according to claim 1, wherein the moving means includes an instruction means for instructing movement and a drive means for driving based on the instruction means. 8. The visual acuity test apparatus according to claim 1, further comprising an optometry table, and having storage means for accommodating the display in the optometry table. 9. The visual acuity test apparatus according to claim 1, wherein an image pickup means for picking up a face or the like of a subject, an image storage means for storing the picked-up image, and an image displayed by combining the stored images. A visual acuity test device comprising a synthesizing circuit and displaying a captured image on the display. 10. The visual acuity test apparatus according to claim 1, wherein the display is connected to a computer and is shared as a terminal display of the computer.