RU1782578C - Method for optimization visual perception when working with video-display devices - Google Patents

Abstract

Use4 in medicine, namely in ophthalmology. The method is based on the fact that when selecting optical correction for the working distance, in addition to the accommodation voltage and the degree of ametropia, the own aberrations of the screens of video display devices are taken into account. Essence: the correction for the proper aberrations of the screen is measured at the maximum and minimum brightness of the image by objectively recording the load with positive spherical lenses, which causes a loss of perception of the image on the screen under the conditions of observation of the latter through a precisely focused optical system, and the parameters of the optimal optical correction are calculated as the algebraic difference between the value of dynamic refraction and the average correction for intrinsic screen aberrations. Using the method eliminates the spasm of accommodation and improves the accuracy of determining the strength of corrective lenses during optical correction of persons working with displays.

Description

The invention relates to medicine, in particular to ophthalmology, and is intended to select the optimal optical correction for persons working with displays.

A known method for optimizing visual perception when working with video display devices by selecting optical correction for the working distance according to the value of dynamic refraction.

A disadvantage of the known method is that when it is carried out, only the aberrations associated with the optical and accommodation devices of the visual system are compensated and the aberrations of the video display devices are not taken into account. In addition, the known method does not take into account the symbol size of the working image, which can lead to errors in

the appointment of optical correction to persons working with displays, and serve as a prerequisite for the occurrence of a spasm of accommodation.

The purpose of the invention is to eliminate accommodation spasm and increase the accuracy of determining the power of corrective lenses.

The goal is achieved in that in the method of optimizing visual perception when working with video display devices by selecting optical correction for the working distance by the value of dynamic refraction, the parameters of optical correction are calculated as the algebraic difference between the value of dynamic refraction and average correction, which are determined at the maximum and minimum image brightness

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Yu ate VI

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The method for optimizing visual perception and working with video display devices is carried out in three stages: at the first stage, the dynamic refraction of the test subject to the working distance is determined; in the second stage, the average correction for the display screen aberrations; and in the third, the optimal optical correction for working behind the display is calculated.

1 etap. A subject using laser refractometry using dynamic diffuse speckle is used to determine dynamic refraction at the working distance according to the standard method. The values of dynamic refraction are recorded in diopters. right eye, left eye and binocular.

2 etap. The test subject is shown on the VTU screen a character-specific image and the minimum brightness is set at which operation is still possible. Then, at the working distance, strictly opposite the screen, an optical system is installed (for example, a mirror-type camera) and it is focused exactly on this distance. After that, the test subject is asked to look at the image on the screen of the video display device through the eyepiece r of the video detector of the optical system, and a spherical lens +0.25 diopters is mounted in front of the lens. If it is possible to distinguish characters on the screen, then the optical load is amplified by +0.25 diopters. etc. up to the moment when the screen image becomes impossible, the optical power of the lens at which this occurs corresponds to the correction value for the screen's own aberrations at minimum brightness.

Next, the screen brightness is changed to maximum and the load is repeated with optically positive spherical lenses, after which the average correction value is calculated.

This correction can be obtained objectively as the difference between the total aberrations of the display and the optical system and the intrinsic aberrations of the optical system obtained by photographing texts in reflected light.

3 etap. The algebraic difference between the values of dynamic refraction by working distance and average correction for intrinsic aberrations of the screen, which corresponds to the optimal optical correction for working behind the display, is calculated.

Examples of specific selection of optimal optical correction for working behind a display.

PRI me R 1. Subject E. 34 years. Diagnosis: healthy. Refraction of both eyes is emmetropi.

The study was conducted to verify the need for professional optical correction to work behind the Agate personal computer display 0 with texts with a symbol size of 3x5 mm. The image is black and white.

1.Dynamic refraction at a working distance of 1 m:

5 OD - + 0.25 diopters; OS - +0.25 diopters; OI - +0.25 diopters.

2. Amendment on own display aberration:

0 at minimum brightness - + 0.25 diopters; at maximum brightness - + 0.25 diopters: average - +0.25 diopters.

3. Parameters of optimal optical correction:

5 +0.25 diopters - (+0.25 diopters) 0.

In this case, professional optical correction for working behind the display is not required.

PRI me R 2. Subject M .. 51 years. 0 Diagnosis: mild hypermetropi in both eyes. Presbyopi

The study was conducted to select

professional optical correction

for working behind a personal computer display

5 Agate with texts with a character size of 3 x

5 mm. The image is black and white.

1.Dynamic refraction at a working distance of 1 m:

OD - +2.5 diopters;

0 OS - +2.5 diopters;

OH- + 2.5 diopters.

2. Correction for own display aberrations:

at minimum brightness - ± 0.25 diopters; 5 at maximum brightness - +0.25 diopters; average - +0.25 diopters.

3. Parameters of optimal optical correction:

+2.5 diopters - (+0.25 diopters) 2.25 diopters.

0 The selected optical correction is more comfortable than the correction selected by the dynamic refraction applied to the working distance,

The invention provides an accurate selection of optical correction for persons working with video display devices. The use of a diffuse laser speckle for determining dynamic refraction, which is a weak incentive to accommodation, and the additional weakening forces of corrective lenses by the amount of screen aberrations exclude the occurrence of a spasm to accommodation in the prescribed optical correction

SUMMARY OF THE INVENTION A method for optimizing visual perception when working with video display devices1 by selecting optical correction for the working distance to a large

dynamic refraction, characterized in that, in order to eliminate accommodation spasm and improve the accuracy of determining the power of corrective lenses, the optical correction parameters are calculated as the algebraic difference between the dynamic refraction and the average correction, which are determined at the maximum and minimum brightness of the image.