The functional state of the visual analyzer users of personal computers

Introduction. Performing complex design operations on the screen of personal computers (PC) makes serious demands on the state of the visual system of users, which determined the need to study the impact of intense activity on the function of vision.

The aim of the study is to study the impact of activities from the PC on the functional state of the visual analyzer in persons performing intense visual work in the dynamics of the working day.

Materials and methods. A group of professional PC users performing design work, including the solution of complex and important tasks, is examined. We studied the nature of the work of employees in terms of interest of the visual analyzer. Measurements of lighting parameters at workplaces of PC users were carried out. Dynamic observations of the state of the functions of the visual organ of the examined persons were made.

Results. PC users performed accurate visual work, solved complex tasks, the time of work with the screen was more than 7 hours during the working day. The organization of lighting and lighting indicators in the workplace meet the standards. The study of the functions of the visual analyzer showed an extension of the simple sensorimotor reaction time in the first half of the working day by 11.1%, by the end of the work — by 25.0%. Visual performance according to the Landolt test by the number of viewed signs and errors significantly decreased during the working day. The decrease in color sensitivity in the dynamics of the working day extended to all the colors presented, there was no complete restoration of color differentiation during the lunch break. By the end of the work, the increase in color separation thresholds was 33.5–39.0%. The change in the condition of visual functions according achromatic disperarii and sensorimotor reactions depending on the duration of the work. After the first hour of work develops eyestrain, increasing the duration of work with the PC leads to a further change in the functions of vision, increasing fatigue. Correlation analysis showed a direct relationship between the duration of work and the deterioration of functions.

Conclusions. The results of the study show the development of visual fatigue, reduced color sensitivity, change in the speed of processing of visual information. An important role for the preservation of visual and overall performance is the organization of labor: the introduction of breaks after each hour of work will reduce the rapid development of vision fatigue. Periodic medical examinations play an important role in the prevention of morbidity. Awareness of users about the adverse factors of working conditions and workflow when using a PC is also relevant.

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