SU1531979A1 - Method of measuring visual acuity of imaginary blind eye - Google Patents

Abstract

This invention relates to ophthalmology. The purpose of the invention is to improve accuracy. To do this, in the method of measuring the visual acuity of a supposedly blind eye by applying an optical prism installed by the base in the vertical meridian, the prism is installed in front of the healthy eye and in a free field a limited number of isolated tests with given angular sizes are determined, and are the true acuity of vision.

Description

The invention relates to media, in particular to ophthalmology, and can be used in medical-labor examination of eye Diseases, in clinical practice for the detection, aggravia and simuli of monocular blindness and in other cases where it is impossible to determine the acuity of vision. rely on the testimony of the subject.

iel from; reteni - povpepenie accuracy.

The goal is achieved by the fact that, according to the proposed method, a prism is set 11 in front of a healthy eye with a base in a vertical meridian and demonstrates in a free field a limited number of isolated test pads with given angular dimensions.

The method is illustrated by the following examples.

Example 1, Patient K, 24 years old. Complaints of reduced right vision

eyes that, in his opinion, interfere with the driver’s doing his job. Noah blindness considers the injury of the right eye received a year ago.

When checking, he showed the sharpness of the eyesight of the right eye - the score of the fingers on the face -0.02, the left -1.0. Objectively - the refraction of both eyes is emmetropically.

When carrying out the well-known breakthrough) reading was difficult. However, with the help of a well-known test, it was not possible to answer the question about the suitability of the person being studied for driving, since the true acuity of his eyesight was not revealed. In connection with this, the patient is put into a test case in front of a healthy eye. a 6.0 D prism was inserted with the base upwards and isolated tests were presented on a white screen with an ingress of light projection. The demonstration of tests began with tests with an angular size of 2.0 units. spice

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view. Recognition of characters began with the presentation of tests corresponding to a visual acuity of 1.0; when presenting a test equal to a sharpness of vision of 0.6, a doubling was found. An additional image appeared at the bottom of the first one. However, the subject could not determine the shape of the enlarged additional image.

With a further increase in the test, the subject identified the additional image that had arisen with an angular size of the test corresponding to an eye sharpness equal to O, A, Conclusion; the patient has a true visual acuity of the right eye - 1.0, the left - 0.4. The patient is suitable for driving a car.

Example 2. Patient I.32 years. Indicates that it is impossible for the healer to work because of the reduction in the vision of the left eye as a result of a work injury due to a work injury. From the medical records, the patient actually had a concussion of the left eye 2 years ago. There are no complaints on the right eye, although the patient notes that before the injury, the left eye could see better. To address the issue of working ability, a proposed study has been conducted,

In determining the acuity of vision in the usual way, the subject showed the sharpness of the right healthy eye 0.7, not a correspondent, and the left eye - the movement of the arm in the liya.

The refraction of the right eye is wrong - asp-Egmatism to 0.5 D, the left - emmetropi.

When biomicroscopy on the cornea of the right eye was found a small clouding in the form of a cloud. No changes in the left eye.

The patient was put a prism with a force of 6.0 D and the base up in front of a healthy eye, and, with the help of a snow projector, showed isolated tests from a distance of 5 m from the subject. The test was shown in reverse order, starting from the smallest, the details of which are visible at an angle of 2.0 o.

etc. When presenting the test, respectively. 1.5, the test has determined the shape and number of characters. Upon further demonstration of ever-increasing tests on a sign corresponding to a sharpness of sight 0.8, an additional unidentified image appeared, while further demonstration the additional picture became recognizable when the test was shown, corresponding to a lean visual sharpness of 0.7.

Thus, the correct determination of test marks corresponding to the sharpness of sight 1.5 was carried out with a supposedly blind eye, its sharpness of sight turned out to be above the other, healthy eye, which the patient does not complain about. This is confirmed by the fact that upon further presentation of tests with their angular size equal to the sharpness of vision 0.7, an additional image became recognized.

Conclusion: the true visual acuity of the right eye is 0.7, the left, apparently blind, -1.5 eye. The patient simulates monocular blindness in his left eye. Suitable for the previous work.

Compared with the prototype, the proposed method allows not only to reveal the simulation and aggravation, but also to determine the visual acuity of the allegedly watching the eyes.

Claims (1)

Invention Formula A method for measuring the visual acuity of a supposedly blind eye by using an optical prism installed by a base in a vertical meridian, characterized in that, in order to improve accuracy, the prism is installed before a healthy eye and demonstrated in a free field a limited number of isolated tests with predetermined angular dimensions and moments distinguishable primary and secondary images determine the true sharpness of the vision.