JP2008036370A - Eyeshade for eye position detection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an eyeshade for eye position detection, allowing an examiner to observe a tested eye. <P>SOLUTION: In this eyeshade for eye position detection, an optical element having light scattering action is provided with a handle having a length to be held in one hand. In the eyeshade, a light scattering plate having action of strongly bending light rays to a specified direction and scatting the same is used as the optical element. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an eye shield used for ophthalmic eye position inspection.

  In the shielding test for examining the eye position, one eye of the subject is shielded by the eye shield provided by the examiner, and the position of the eye under the shielding is estimated by observing the movement of the eye when the shielding is removed. It is an inspection. For example, in the case of the oblique position, the occlusion eye (the occluded eye) moves rapidly from the ear side toward the front as soon as the occlusion is removed. By observing this movement, it can be inferred that the eyes were facing the ear side under shielding. If you can see the static eye under the shield, it will help with the diagnosis. Conventional eyepieces are opaque and the inspector cannot see the shielding eyes.

In order to know the state of the eye under shielding, there has been proposed a method (Patent Document 1) in which an eye to be examined is shielded with a filter that cuts off visible light and transmits infrared light (Patent Document 1). However, this method requires tools for handling infrared rays.
JP1993-245105

  It is an object of the present invention to obtain an eyepiece that can see the state of the eye under shielding and is easy to operate.

  A diffuser plate 1 is attached to one end of a handle 2 that is long enough to be held with one hand (FIG. 1). When viewed through the diffuser plate, objects close to the diffuser plate can be clearly seen, but objects distant from the diffuser plate can be seen only faintly. When this eyepiece is placed on the eye to be examined, the examiner can clearly see the eye to be examined through the diffuser, but the subject cannot clearly see the target 50 cm away due to the diffuse action. The occluded eye sees a blurred image, hindering binocular vision and taking the original eye position. Therefore, the function of shielding is the same as that of the conventional eyepiece. As the light diffusing plate, a ground glass (FIG. 1), a lenticular lens (FIG. 2, a structure in which a large number of cylindrical lenses are arranged in parallel on a plane) or the like is used. The frosted surface of the ground glass or the lens surface of the lenticular lens (upper surface of the diffuser plate in FIG. 4) is directed toward the subject's eye, and the smooth surface (lower surface of the diffuser plate in FIG. 4) is used toward the examiner. This is because it is better that the surface having the light scattering action is as close as possible to the eye to be examined.

  When using ground glass with many thin line-shaped scratches parallel to one direction, an image extending in the direction perpendicular to the scratch direction is seen. In addition, when a lenticular lens is used, an image that is superimposed several times in the direction perpendicular to the axis of the cylindrical lens is seen. If the direction of the diffuser plate can be changed when these directional diffuser plates are used, the direction of image deformation can be changed. An annular frame 3 is attached to the handle 2, and the diffuser plate 1 is fitted (FIGS. 3 and 4). Since the diffuser plate 1 is not fixed to the frame 3 (FIG. 4), it can be rotated and changed in direction as indicated by an arcuate arrow (FIG. 3).

  1. With this eye shield, you can clearly see the eyes in the stationary state under the shield. 2. Since the shielding eye can be seen through the shielding plate, the shielding plate can be made small and easy to handle. 3. When the direction of the scratches in the ground glass with a fine scratch parallel to one direction is leveled and the examiner turns on a small electric light 50 cm in front of the subject's eyes, the shielding eye Since one line is seen, if the subject is asked about the positional relationship between the image of the open eye (light circle) and the image of the occluded eye (light line), it can know the presence or absence of the binocular vision function. it can. If the axis of the cylindrical lens of the lenticular lens is made horizontal, one line of light appears vertically, which also has the same function as the ground glass. 4. If a diffuser plate can be turned when a directional diffuser plate is used, not only the horizontal oblique position but also the upper and lower oblique positions can be handled.

  A frame 3 is attached to one end of the handle 2, and the diffuser plate 1 is fitted into the frame. Alternatively, the diffuser plate and the handle are integrally formed with a transparent resin.

  In Example 1 (FIG. 1), a diffuser plate 1 that scatters light in various directions is fixed to a handle 2. Example 2 (FIG. 2) uses a diffuser plate that has the effect of strongly scattering light in a specific direction. In Example 3 (FIGS. 3 and 4), the diffuser plate 1 is rotated along a plane including the frame 3.

FIG. 2 is a plan view of the first embodiment. FIG. 6 is a plan view of Example 2. FIG. 6 is a plan view of Example 3. The BB cross-sectional enlarged view of the part A of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light diffuser plate 2 Handle 3 Frame A The part where a cross section is illustrated

Claims (3)

  An eyepiece for eye position inspection with a handle that is long enough to be held with one hand.   The eyepiece for eye position examination according to claim 1, wherein a light diffusing plate having an action of strongly bending and scattering light rays in a specific direction is used as the optical element.   The eyepiece for eye position inspection according to claim 2, wherein the diffuser plate can be rotated.

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