JPH0310727Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a stereoscopic examination chart having a polarized stereoscopic optotype consisting of a pair of polarized optotypes whose polarization axes have different angles.

(Prior art) As shown in FIG. 3, in the conventional stereoscopic inspection, the filter consists of a right-sloping polarization filter R having an upward-sloping polarization axis and a left-sloping polarization filter L having an upward-left polarization axis. polarized glasses 2
use. Further, as shown in FIG. 4, the stereoscopic visual inspection visual chart 10 includes a polarized stereoscopic visual target 20 consisting of a right-sloping polarizing plate R and a left-sloping polarizing plate L, and planar visual targets 12 and 13 having light-blocking properties. , 14. The polarized stereoscopic visual target 20 is viewed by a person with normal stereoscopic vision through the polarized glasses 2, and the two-dimensional visual target 12,1
An optotype 22 having the same shape as 3 and 14 is observed in a raised position.

However, this stereoscopic vision test optotype 10 can be used to determine which optotype is a polarized stereoscopic optotype from the appearance of the optotype by looking at it before wearing the polarized glasses 2 or by closing one eye after wearing it. There was a problem in that it was not possible to easily judge and perform accurate inspection.

(Purpose of the invention) The present invention was created in view of the above-mentioned problems with conventional stereoscopic visual examination charts. It is an object of the present invention to provide a stereoscopic vision test visual chart that cannot tell whether a visual target is a polarized stereoscopic visual target or not even if the visual target is equal to the stereoscopic visual target.

(Structure of the invention) The present invention provides a visual chart used for stereoscopic vision testing performed through a pair of polarizing filters for the left and right eyes, whose polarization axes have different angles, and which are shifted in the left-right direction. A first polarization stereoscopic optotype consisting of a pair of polarization optotypes arranged in the same manner as shown in FIG.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. The stereoscopic vision test is performed using polarized glasses 2 and a stereoscopic vision test chart 100, as shown in FIG. The stereoscopic vision test visual chart 100 has a polarizing plate L and a polarizing plate R that correspond to a pair of polarized visual targets. As shown in FIG. 2, these are polarized stereoscopic optotypes 102, 106, and 108 in which the left-sloping polarizing plate L is placed on the left and the right-sloping polarizing plate R is placed on the right, and the right-sloping polarizing plate R is placed on the right. It has a polarized stereoscopic visual target 104 placed on the right and a left-up polarizing plate L placed on the left. Here, polarized stereoscopic visual targets 102, 104, 106, 1
08 is a left-up polarizing plate L and a right-up polarizing plate R
are formed in the same shape, and their mutual positional relationship is also the same. By observing these polarized stereoscopic visual targets through polarized glasses 2,
As shown in FIG.
06,108 is the sunken or rear position 102
Observed as in A, 106A, 108A,
The polarized stereoscopic visual target 104 is observed to be floating, that is, at a position 104B in front.

In this example, a pair of polarizing plates with different angles of the polarization axes of transmitted light or reflected light are used as the polarized stereoscopic visual target, but a light-absorbing material is used in the polarization forming film. It may also be a so-called vector graph, in which a polarizing pattern is formed on the film surface by penetrating the film.

(Effects of the invention) According to the present invention, as described above, by making the plurality of optotypes in the visual chart into polarized stereoscopic optotypes, if the examinee does not look through the polarizing member, the predetermined polarized stereoscopic Because it is difficult to distinguish one visual target from another, and even when viewed with one eye, the images are all almost the same even if there is some positional deviation, the subject must use a predetermined polarized stereoscopic target prior to the test. Knowing this will prevent the test from being inaccurate.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the optical system of a stereoscopic examination chart according to an embodiment of the present invention, FIG. 2 is a plan view of the stereoscopic examination chart, and FIG. 3 is a plan view of polarized glasses. , FIG. 4 is a plan view of a conventional stereoscopic examination chart. L...Polarizing filter rising to the left, R...Polarizing filter rising to the right, 2...Polarized glasses, 100...
...Stereoscopic examination visual chart, 102, 104, 106, 1
08...Polarized stereoscopic visual target.

Claims (1)

[Scope of utility model registration request] In a visual chart used for stereoscopic vision testing performed through a pair of polarizing filters for the left and right eyes with different angles of the polarizing axes, a pair of polarized visual targets with different angles of the polarizing axes and shifted in the left-right direction are used. What is claimed is: 1. A stereoscopic vision test chart comprising: a first polarized stereoscopic chart; and a second polarized stereoscopic chart, which is obtained by transposing the polarized stereoscopic chart in the left-right direction.