RU2721888C1 - Method of determining alternation frequency of liquid crystal glasses for sensory fusion recovery - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely to ophthalmology. Method of determining individual alternation frequency of liquid crystal (LC) glasses for recovering sensory fusions in patients with residual strabismus angle of less than 10 degrees postoperative coagulation convergence surgery consists in the fact that in the patients the duration of the eyeball setting-up time t in ms is determined on the video-oculographic apparatus. That is followed by calculating the frequency of alternating ν in Hz by formula ν=500/(t+40), where t is duration of eye setting motion, ms, 40 – minimum time required for imaging between alternations, ms.

EFFECT: using this method enables determining an individual alternation rate of LC glasses for efficient delivery of visual information.

1 cl, 2 ex

Description

The proposed method relates to the field of ophthalmology and is intended for programming liquid crystal (LC) glasses used to restore sensory fusion in patients, including children.

LCD glasses are used in ophthalmology to treat amblyopia and restore binocular and stereoscopic vision.

A known method of research and restoration of binocular vision using LCD glasses (RF patent for the invention No. 213103). The method consists in presenting images to one or the other eye alternately with a switching frequency of 50 Hz, which is synchronized through a computer with the supply of a visual signal from the television monitor screen to the corresponding eye. This has a positive effect in the normal fusion reflex.

The disadvantage of this method is the inability to use the method to restore sensory fusion due to the high switching frequency, the inability to take into account the length of the installation movements necessary for individual programming of glasses and the adequate flow of visual information into the right and left eye, and this method cannot be used in children in early age (2-7 years).

The authors are not aware of methods for determining the frequency of alternation of liquid crystal glasses to restore sensory fusion.

The objective of the invention is to provide a method for determining the frequency of alternation of liquid crystal glasses to restore sensory fusion, allowing treatment according to individual parameters.

The technical result is the calculation of the individualized required frequency of alternation of LCD glasses to restore sensory fusion, which is the basis for binocular vision.

The technical result is achieved in that in patients with a residual strabismus angle of less than 10 degrees after surgery for friendly converging strabismus, the length of the eyeball installation movement (t) is determined on a video culograph, for example, Gazelab video culograph manufactured by BCN Innova (Spain) and the alternation frequency is calculated (v ) in Hz by the formula: ν = 500 / (t + 40),

Where

t is the duration of the installation movement of the eyeball, ms,

40 - the minimum time required for visualization between alternations, ms (in cinematography corresponds to 25 frames in 1 s),

500 = 1000/2 - recalculation of the number of alternations in Hz; 1000 ms = 1 second

Example 1. Patient M., 5 years old, was operated on for congenital friendly, convergent non-accommodative strabismus. The strabismus angle was 6 degrees. Visual acuity of the right and left eye 1.0. After the operation, the patient revealed a lack of synoptophore in the study of sensory fusion. The nature of vision, examined by a 4-point test from 5 meters at a time. Using videooculography, it was found that the duration of the installation movement is 160 ms. According to the formula, the required frequency of alternation of the LCD glasses was calculated, which was 2.5 Hz. The indicated frequency was set on the LCD glasses. When wearing LCD glasses for 6 months for 6 hours, it was possible to restore sensory fusion daily, and in the future, when undergoing diploptic treatment, binocular vision.

Example 2 Patient E., 19 years old, was operated twice at 5 and 7 years old for a friendly convergent non-accommodative strabismus. At 18, an operation was performed, after which the strabismus angle was 5 degrees. Visual acuity of the right and left eye 1.0. After the operation, the patient revealed a lack of synoptophore in the study of sensory fusion. The nature of vision, examined by a 4-point test from 5 meters at a time. Using the method of video oculography, it was found that the duration of the installation movement is 105 ms. According to the formula, the required frequency of alternation of the LCD glasses was calculated, which amounted to 3.4 Hz. The indicated frequency was set on the LCD glasses. When wearing LCD glasses for 6 months for 6 hours, it was possible to achieve sensory fusion on the synoptophore daily.

The method was applied in 36 patients. The required frequency of alternating points from 1.9 to 4.4 Hz was obtained. The indicated frequency was set on the LCD glasses. When wearing LCD glasses for 3 to 12 months for 6 hours daily, sensory fusion was restored in 82% of patients.

Thus, the proposed method allows you to determine the individual frequency of alternation of LCD glasses for the effective supply of visual information.

Claims (4)

A method for determining the individual frequency of alternation of liquid crystal (LC) glasses for the restoration of sensory fusion in patients with a residual strabismus angle of less than 10 degrees after surgery for friendly convergent strabismus, which consists in the fact that patients determine the duration of the installation movement of the eyeball in ms on a video culograph, then calculate the frequency of alternation v in Hz according to the formula ν = 500 / (t + 40), where t is the duration of the installation movement of the eyeball, ms, 40 - minimum time required for visualization between alternations, ms.