Human-Computer Interaction: Ergonomics and User Interfaces - Vol. 1

By Hans-Jörg Bullinger; Jürgen Ziegler | Go to book overview

Visual Strain and Eye Disorders in Display Uses

Valentina Kovalenko, M.D., Ph.D.
P.O. Box 9141, 310058 Kharkov, Ukraine
Phone: 0572 - 373-428. Fax: 0572 - 791-313

It is known, that work with display units for a long time leads to definite disorders of the functional body state and health in users, among them visual discomfort is situated at the first place ( WHO, 1987). Additional information concerning this problem was obtained for the last years. Some alterations in visual organ itself were revealed, in particular in our special experimental research ( V. V.Kovalenko, 1994).

The aim of this investigations was detailed examination of visual capacity in designers, who used computers in their work for 4 - 5 hours per day, in order to detect profound mechanisms of visual disorders and found the ways for softening of negative influence to human visual system of work with display units.

Our ergoplithalmological approach has been used in this elaboration. It consisted in detailed questionnairing, careful ophthalmological examination with functional tests and physiological visual function study during the working activity. The latter included the evaluation of accommodation (the nearest point of clear vision, NPCV; the time of maximum accommodation, TMA), convergence (the nearest point of convergence, NPC) and retinal function (the time of the following colour contrast, TFCC); general reaction of the eye to work carried out was measured with wink movements frequency, WMF.

139 designers from 21 to 50 years old have been examined with questionnairing and ophthahnological methods. 60 persons of them were subjected to physiological measuring of visual functions - four times during the working day.

According to the data obtained the average frequency of visual fatigue was 69,8% without clear differences connected with age. The astenopic complaints were: headache, dizziness, head heaviness, nausea and even vomiting, a feeling of eye fatigue, conjunctiva! hyperimia, lacrimation, eyeball pain and heaviness,

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