JP4125253B2 - Dynamic visual acuity measurement device - Google Patents

Description

  The present invention relates to a moving object visual acuity measuring apparatus that measures a dynamic visual ability of a subject. More particularly, the present invention relates to a dynamic visual acuity measuring apparatus capable of measuring actual dynamic visual ability including correlation between DVA dynamic visual acuity and KVA dynamic visual acuity.

  It is known that dynamic visual ability, which is the ability to clearly see moving objects, is important in order to exhibit excellent athletic ability in various sports. In driving a vehicle or the like, it is necessary to accurately determine signs, signs, signals, and the like during traveling, and dynamic visual ability is important from the viewpoint of safety.

  This dynamic visual ability is mainly the ability to visualize a dynamic visual acuity (DVA) dynamic visual acuity, which is an ability to clearly view a target that moves in the vertical and horizontal directions, and an index that mainly moves in the longitudinal direction. KVA (Kinetic Visual Accuracy) and visual acuity.

DVA moving visual acuity is an ability mainly based on the movement of the eyeball, and is considered important for sports such as soccer and basketball that need to grasp the movement of a person.
The KVA moving body visual acuity is based on the response speed of the crystalline lens not accompanied by the movement of the eyeball, and is considered to be important for driving sports such as baseball and tennis, capturing sports balls, and vehicles.

  Conventionally, as a device for measuring DVA dynamic visual acuity, a lateral dynamic visual acuity meter (product name HI-10) manufactured by Kowa Co., Ltd. is known, and a structure for moving a Landolt ring projected on a screen by a projector in a horizontal direction is used. (Patent Document 1). However, since it is necessary to arrange the screen at an equal distance from the projector, there is a problem that the apparatus is large and expensive.

  As a device for measuring KVA dynamic visual acuity, a dynamic visual acuity meter (KV-100) manufactured by Nidec Co., Ltd. is known, and has a structure in which a distance is changed by moving a visual target or a prism (Patent Document 2). . However, due to the structure that physically moves objects such as prisms, there was a limit to speeding up the movement of the target.

In addition, each of the above devices can only measure either DVA moving visual acuity or KVA moving visual acuity, and can measure dynamic visual ability including correlation between both DVA moving visual acuity and KVA moving visual acuity so far. Did not exist.
Japanese Patent Laid-Open No. 11-164815 JP 2000-201893 A

  Provided is a moving object visual acuity measuring apparatus capable of speeding up movement of an index in KVA moving object visual acuity measurement and capable of measuring dynamic visual ability including correlation between both DVA moving object visual acuity and KVA moving object visual acuity.

In order to solve the above problems, as claimed in claim 1, the display surface of the moving body display device, formed as close portion and far remote unit is continuously close to the position of the subject, the remote portion of the display surface A moving object visual acuity measuring device is provided by providing display control means for displaying the moving image between the moving part and the proximity part so as to move and deforming the moving image so that the moving image is equal to that when the display surface is viewed from the front. .

  As described in claim 2, the display control means determines an angular velocity or an angular acceleration of the moving object image from a virtual distance and direction between the position of the subject and the moving object image, and the moving object image according to the value. A moving object visual acuity measuring apparatus that controls the speed and size of the object is provided.

  According to a third aspect of the present invention, there is provided a moving body visual acuity measuring device in which the moving body display means is formed of an EL element.

  According to a fourth aspect of the present invention, there is provided a moving body visual acuity measuring device in which the display surface is constituted by a concave curved surface.

As described in claim 1, the moving object display means is formed so as to have a proximity part and a remote part with respect to the position of the subject, and the image of the moving object is distorted by the display control means on the display surface of the moving object display means. by deforming and displaying so as not to display an image of a perspective moving object remembering depth on the display surface, because there is no need to physically move the object during the measurement, the moving speed of the image of the moving object Increase speed.

  According to the second aspect, the angular velocity or angular acceleration of the image to be actually projected on the retina is calculated, and the moving object is determined according to the calculation result and the virtual distance and direction between the position of the subject and the moving object image. By displaying the video, it is possible to display a video of a moving object that matches the reality, and it is possible to perform practical measurement evaluation and to improve practical visual acuity.

  According to the third aspect of the present invention, since the moving object display means is configured by an EL (electroluminescence) element, a high-speed display with a high switching speed is possible, and an image of the moving object can be displayed at a higher speed. A moving object visual acuity measuring apparatus including moving object display means having excellent corners can be obtained.

  As described in claim 4, by configuring the display surface of the moving object display means as a curved surface, an image of the moving object can be displayed over the viewing angle of the subject, which is more realistic and realistic. Can measure moving vision.

The details of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic horizontal sectional view of a moving object visual acuity measuring apparatus according to the present invention.
The moving body display means 1 is supported by a shaft support portion 4 and a support portion 5, and the moving body display means 1 is configured to be rotatable about the shaft support portion 4. Further, a display control means (not shown) is connected to the moving object display means 1 to control the display of moving object images such as a visual target and a landscape.

  FIG. 2 is a front view when the moving object display means 1 is at the position shown by the solid line in FIG. The moving body display means 1 is arranged at a position that is oblique with respect to the line-of-sight direction from the position 2 of the subject, so that the display surface has a depth. On the moving object display means 1, a Landolt ring 3 which is one of the visual targets is displayed as a moving object image.

  The Landolt ring 3 moves in the left-right direction of the moving body display means 1, that is, from the back to the front or from the front side to the back as viewed from the position 2 of the subject. The display surface of the moving body display means 1 is inclined with respect to the line of sight from the position 2 of the subject, and the Landolt ring 3 appears to be distorted to the subject. Therefore, the Landolt ring 3 is deformed by the display control means so that the viewing angle between each point of the displayed target is equal to that when the display surface is viewed from the front, so that the similar enlargement or similar reduction appears. Moved.

  Based on the virtual distance and moving direction between the subject position 2 and the moving object image set in the moving object image, the display control means actually displays the object or landscape in the distance and the direction. When the moving body is viewed with the eyes, the angular velocity or angular acceleration of the image projected on the retina is calculated, and the speed and size of the moving body image are controlled according to the calculated value.

  By displaying an image of a moving object as if the object was actually moved, it can look like an actual moving object. On the other hand, since the object is not actually moved, the moving speed of the moving object image can be increased, and the actual moving object eyesight can be measured and the moving object eyesight can be improved.

FIG. 3 is a front view when the moving object display means 1 is at the position shown by the broken line in FIG. 1. When measuring the DVA moving object visual acuity, the moving object display means 1 is arranged at this position.
The moving object display means 1 displays a Landolt ring 3, which is one of the visual targets, as a moving object image.

  By configuring the moving body display means 1 so as to be rotatable by the shaft support portion 4, the display surface can be made perpendicular or oblique to the line of sight of the position 2 of the subject. When the display surface is perpendicular to the line of sight from the position 2 of the subject, the DVA dynamic visual acuity can be measured. When the display surface is crossed, the dynamic including the correlation between the DVA dynamic visual acuity and the KVA dynamic visual acuity is included. Visual ability can be measured.

FIG. 4 is a schematic horizontal sectional view showing a second embodiment of the moving object visual acuity measuring apparatus. The difference from the above embodiment is that the two moving object display means 1 are connected by the shaft support 4.
The moving body display means 1 is connected by a hinge or the like, and each moving body display means 1 is configured to be rotatable about a shaft support portion 4.

  When measuring the DVA moving visual acuity, the moving object display means 1 is arranged at the position shown by the broken line, and when measuring the dynamic visual ability including the KVA moving visual acuity or the correlation between both the DVA moving visual acuity and the KVA moving visual acuity, the solid line The moving object display means 1 is arranged at the position shown in the figure.

  Since the moving object display means 1 is arranged from the front of the subject's position 2 to the left and right and given depth, it is possible to display moving images with a more realistic perspective, such as baseball and soccer. The baseball and soccer balls are displayed as moving images along with the images viewed by players in various sports, and the traffic signs and road markings viewed from the drivers of vehicles traveling on the road are displayed as moving images. By doing so, it is possible to measure the actual dynamic visual acuity including the correlation between the DVA dynamic visual acuity due to the movement of the eyeball and the KVA dynamic visual acuity due to the response speed of the lens, and the actual dynamic visual acuity can be improved.

FIG. 5 is a schematic horizontal sectional view showing a third embodiment of the moving object visual acuity measuring apparatus. The difference from the above embodiments is that the moving body display means 1 is formed of a flexible material made of EL elements.
The moving body display means 1 is pivotally supported by the shaft support portion 4, and by moving the support portion 5, the display surface can be curved to form a concave curved surface.

The moving object display means 1 uses an EL element whose switching speed is higher than that of the liquid crystal, and can increase the moving speed of the moving object image as compared with the liquid crystal display.
Moreover, since the EL element is self-luminous, it has an excellent viewing angle, and even if the moving body display means 1 is arranged obliquely with respect to the line-of-sight direction from the position 2 of the subject, the moving body has sufficient display performance. A visual acuity measuring device can be obtained.

  In the second embodiment, the shaft support portion 4 has a bent portion, and the moving body image cannot be displayed on the bent portion. However, in this embodiment, the moving body image is also displayed on the shaft support portion 4 portion. Therefore, it is possible to display a moving image over the viewing angle of the subject, and to obtain a realistic sensation of reality.

  Here, moving images include images such as landscapes and scenery, characters such as kana characters, kanji, alphabets, Arabic numerals, Roman numerals, and targets such as Landolt rings and Snellen targets, rectangles, pentagons, etc. Includes shapes.

The horizontal cross-section schematic diagram of the moving body visual acuity measuring apparatus which concerns on this invention. The front view of a moving body display means. The 2nd front view of a moving body display means. The horizontal cross-section schematic diagram of 2nd Example of a moving body visual acuity measuring device. The horizontal cross-section schematic diagram of 3rd Example of a moving body visual acuity measuring apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Moving body display means 2 Position 3 Landolt ring 4 Shaft support part 5 Support part

Claims (4)

Displaying the display surface of the moving body display device, as close portion and far remote unit closer to the position of the subject is formed to be continuous, between the proximal part and a remote part of the display surface the image of the moving object moves In addition, a moving visual acuity measuring device provided with display control means for deforming the moving image so that the moving image is equal to that when the display surface is viewed from the front .   The display control means determines the angular velocity or angular acceleration of the moving image from a virtual distance and direction between the position of the subject and the moving image, and controls the speed and size of the moving image according to the value. The moving visual acuity measuring device according to claim 1, wherein   2. The moving object visual acuity measuring apparatus according to claim 1, wherein the moving object display means is formed of an EL element. The moving object visual acuity measuring apparatus according to claim 1, wherein the display surface is configured by a concave curved surface.

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