SU1704753A1 - Method for determining the distance between the lens centers in selecting the corrective spectacles - Google Patents

Abstract

The invention relates to medicine, in particular to ophthalmology, and can be used in daily practice in the selection of corrective glasses. The aim of the invention is to improve the accuracy of the selection of corrective glasses by taking into account muscular balance and orientation of the visual axes of the eyes. For this purpose, monocularly matched corrective lenses are placed in the lens holders of the test rim, one of which is paired with the Meddox cylinder (horizontal axis), and a pair of Meldox cylinder — a corrective glass in the horizontal plane is displaced to a subjective feeling that the vertical red strip coincides with a point source of light . For the required distance between the centers of the corrective lenses, they take the distance that was formed between them after the displacement of the lens holders. 2 Il. 8 (I

Description

The invention relates to medicine, in particular to ophthalmology, and can be used in daily practice in the selection of corrective glasses among the population.

The purpose of the invention is to increase accuracy by taking into account the muscle balance and orientation of the visual axes of the eyes.

This is achieved so that monocularly selected corrective lenses are placed in the lense-holder of a test rim, one of which is paired with the Meddox cylinder (axis is horizontal), and the pair of Meddox cylinder — the corrective glass in the horizontal plane is displaced to the subjective feeling that the vertical red strip coincides with point source

Sveta. For the required distance between the centers of the corrective lenses, they take the distance that was formed between them after the displacement of the lens holders.

The proposed method makes it possible to reveal and eliminate the imbalance of the eye muscles in ametropes in corrective glasses. Muscle balance assessment is based on the use of Cilindoa Meddox, and its compensation for heteroioric therapy is based on the use of the prismatic action of the peripheral parts of the corrective lenses. The studies have been conducted from the distance for which the corrective glasses are intended, and are as follows. In one of the linderers of the test specimen is inserted the Meddox cylinder (axis

one

ABOUT

V VJ

JV CJ

-

horizontally) after a monocular selection of corrective lenses. The subject, fixing a two-point point source of light, must determine the position relative to its vertical red band. If they do not match, horizontal heterophoria is diagnosed (see Fig. 1 for the light path in the patient's eye when installing the optical centers of the corrective lenses in exact accordance with the interpupillary distance; when exophoria, the image of the object is localized on the disparity points of the retina {Ј - central mka). To compensate for the lens holders of the test tube, if the lenses are negative, they shift the rim on the scale of the exophoria to the temple, and in the case of esophoria, on the nose (when using positive lenses, they are displaced in opposite directions). A combination of a point source of light and a vertical red band is achieved (see Fig. 2, which shows the change in the course of light rays in the patient’s right eye when the corrective glass is decentralized; due to the prismatic effect of its periphery, the light beam falls on the area of the retinal centroid). The distance between the centers of the corrective lenses in this position is determined by the scale of the test rim. It should be indicated in the recipe for glasses. The proposed method can be used both for the correction of spherical ametropia and astigmatism.

Example. Patient E., examined 19.05.So. The acuity of the vision of each eye is 0.3, with a correction sphere of + 5.0 Dptr 1.0. At the location of corrective lenses in accordance with the interpupillary distance (53 mm), an exoiury of 7.5 pr.dptr was detected. When de-centering corrective lenses to mm iS, orthophoria is diagnosed. The patient notes a significant increase in comfort.

Example 2. Patient P., examined on 05/19/33. The acuity of the vision of each eye is 0.3, with a correction sphere of + 3.5 Dpi 0.3. At the location of corrective lenses in accordance with the interpupillary distance (60 mm), an esophoric 3.5 pr.dprtr was revealed.). Poi decentration of corrective lenses up to 67 mm is diagnosed orthophori. A patient

five

ten

20

25

15 40 45, an increase of com30

35

five

notes significant fortitude.

Example 3. Patient A., examined 22.About 33. The visual acuity of each eye is 0.1, with a correction sphere - 5.0 Dptr 1.0. At the location of corrective lenses in accordance with the interpupillary distance (60 mm), exophori 8.0 pr.dptr was detected. With decentralization of corrective lenses up to 71 mm, orthophoria is diagnosed. The patient notes a significant increase in comfort.

The proposed method is simple to perform, does not require any additional equipment, allows you to assign corrective glasses based on the individual functional characteristics of the patient’s eyes (orientation of the visual axes and muscular balance of the eyes), eliminates the need to use additional prismatic elements that degrade the appearance of the glasses, reduces the time and cost of making corrective glasses. The method can be performed in seconds.

Claims (1)

Patients with various types of ametropia and presbyopia were observed. 3, the result of the examination in 17 of them revealed a heterophop. In order to eliminate it, it was necessary to concentrate the corrective lenses from 10 mm in the direction of decreasing to 12 mm in the direction of increasing relative to the interpupillary distance. The heterophori is completely eliminated in all cases. 15 people noted a noticeable improvement in the comfort of vision in glasses with decentered glasses. Invention Formula The method of determining the distance between the centers of the lenses when selecting corrective glasses. It is distinguished by the fact that, in order to increase accuracy by taking into account the muscular equilibrium orientation of the visual axes of the eyes, monocularly correcting lenses are selected and a Neddox cylinder with a horizontal axis is positioned against one of them, then a pair of lens-Meddox cylinder is moved in the horizontal plane until the subjective feeling that the vertical red band coincides with the point source of light and the claim is marked on the scale of the test frame the distance between the centers of the corrective lenses. Il R Editor T. Smirnova Tehred M. Didyk Order Y1 Thira Subscription All-Russia Institute of Scientific and Technical Information of the State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., K / S Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Proofreader N. Revska