Biomedical subjects
Publications and source records attributed to V Koĭcheva.
Research in laboratory and on-site conditions was performed to establish correlations between the visual analyzer's functional shifts in display operators, and the duration of work, the type of the screen used (coloured or non-coloured), the duration of the eyes, fixation on the screen, as well as sex related differences.
The state of the visual apparatus as well as the changes in the functional state of the visual functions, due to the work performed, were studied in 60 female workers checking up the quality of ampoules. The eyes were clinically examined with a view to detection of eye diseases. The results revealed a high percentage of complaints from the visual system, high visual strain, due to the small size of the details to be checked and the irregular illumination of the visual field and the high rate of work. Pathological changes were found in the anterior segment and fundus of the eyes in a great number of the workers. Recommendations are proposed for the optimization of the work in that kind of activity.
Visual perception is an important factor of human activity. The quality of production activity of the worker depends on its accuracy and speed. Representative groups of workers with various occupational activities, associated with considerable loading of visual system, were systematically examined by clinical and functional methods in the course of several years. A total of 765 subjects were examined, aged from 20 to 55 and a length of service from I to 25 years. The results reveal considerable alterations in visual system within one working day. The most general features of those alterations are as follows: elevation of the threshold of electric sensitivity towards the end of the working day, reduction of light-distinguishing and colour distinguishing sensitivity, the closest point of clear vision is removed father, unproper ergogram with an ascending course, reduction of fusion ability towards the end of the working day, etc. A great part of the subjects over the age of 40, were established to have uncorrected presbyopia, leading to high strain of accommodation and convergation, followed by visual fatigue. The adaptation of visual system to labour conditions is the best at the age range 25-35. The alterations in the visual function are far better manifested in the age group over 40. The determination of fatigue degree and the time of developing of the first alterations is of particular significance for the introduction of additional rest for rehabilitation.