RU1800961C - Method for diagnosis of fatigue of visual analyzer - Google Patents

Abstract

The invention relates to the field of medicine and can be used in occupational health and occupational diseases. The method improves diagnostic accuracy. To do this, the critical frequency of flickering of green light flickers at the moment of changing the flicker color is recorded, then the critical frequency of light flickering of red colors at the moment of perceiving them as solid yellow. The degree of human fatigue is determined by the difference in the values obtained.

Description

The invention relates to the field of medicine and can be used in hygiene and physiology of work.

The purpose of the invention is to increase the accuracy of recording the critical fusion frequency of light flickers by superimposing the frequencies of the presented signals on top of each other.

This goal is achieved by registering the critical frequency of fusions of light flickers of green color at the moment of changing the color of flickers, and then the critical frequency of fusions of light flickers of red color at the moment of perceiving them as solid yellow, and by the difference between the obtained values there is a degree of human fatigue. Red and green light signals are supplied asynchronously through an optical prism with the same dynamic frequency (acceleration). After registering the FFMC to green, the given signal frequency remains constant, and red light signals continue to be emitted at the same dynamic frequency.

The test subject's response (pressing the signal button) at the moment of flashing yellow and red lights increases the objectivity of registering KCHSSM to green by changing the perceived blinking light signals. When a constant light of yellow light is generated, a CKSSM is detected in red; The examinee perceives a blinking light of green and red color on not blinking, there is a visual combination of frequencies of red and green colors.

ABOUT

about

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The method is carried out as follows.

In the field of view of the subject (at a distance of 30-50 cm from the eyes), two light sources are placed - red (LED AL-114G) and green (LED AL-114B) colors that flicker asynchronously with a frequency of 20-15 Hz and are perceived by the subject through optical a prism. You can use reflective or dividing prisms that provide a given directivity of the rays of light to the eye of the subject (Begunov B.N., Zakaznoye N.P., 1973).

Then simultaneously increase the frequency of light flicker of both LEDs at a speed of 2 Hz / s and, first, by the test subject’s reaction to the occurrence of yellow and red light flicker, register KCHSSM to green, and then, by the test person’s reaction to the appearance of constant yellow, KCHSSM to red. At the same time, the frequency of supplying green light signals after registering the KCHSSM on the green color remains constant (i.e., corresponds to the KCHSSM value), and the frequency of the red light signals continues to change upwards.

After determination of the FFMM on the green and red colors, the difference of indicators is calculated, i.e., the spectral asymmetry of the perception of the frequency of light flicker, which characterizes the degree of human fatigue. The percentage ratio of the difference between KCHSSM on red and green in color to KChSSM red, exceeding 6%, is estimated as severe fatigue (unsatisfactory functional state), and less than 4.4% - as the absence of fatigue (good functional state (V. A. Maskimovich) , 1985).

Example. The examined I-V was located in front of the optical prism, behind which red and green LEDs were placed, to which an electric current with a frequency of 10 Hz was applied. The red and green LEDs blinked. The subject was asked to press the signal button at the moment when he saw the light flashes of yellow and red, and then press the signal button at the moment of the appearance of a steady yellow light. In the experiment, the examinee pressed the signal button for the first time at a frequency of 30 Hz (flashing yellow and red), the second time at a frequency of 35 Hz (for flashing yellow). KCHSSM on green color in this case was equal to 30 Hz, KCHSSM on red color - 35 Hz. The difference between KCHSSM on red and green is 5 Hz, which is 14.3% of

KCHSSM on red color. The spectral asymmetry index of the examined I-va, equal to 14.3%, is assessed as severe fatigue (unsatisfactory functional state).

The proposed method for detecting fatigue in the human visual system improves the accuracy of determining fatigue by increasing the accuracy of registration of the FFMC on green and red.

FORMULA AND SECTION

Claims (3)

1. A method for diagnosing fatigue of a visual analyzer by determining the critical frequency of flickering of light flickers of red and green colors and diagnosing the degree of fatigue by the difference between the obtained values, characterized in that, in order to improve accuracy, register the critical frequency of flickering of flickers on the green color at the moment the flicker color changes, and on red - at the time of perceiving them as a solid yellow color. 2. The method according to claim 1, with the exception that light signals are supplied asynchronously through an optical prism with the same dynamic frequency. 3. The method of claim 1, wherein in that after registering the critical frequency of flickering fading to green, this frequency is kept constant, and the frequency of red signals is increased in a predetermined mode.