[Study od visual evoked potentials in employees of the Chemical Works in Bydgoszcz]

Examined was a group of 50 persons aged 25-60 years employed in the Chemical Works in Bydgoszcz. The time of professional contact counted from 4 month to 31 years. During this time the workers had contact with the following--at least 2--compounds: chlorine and its derivates, benzene, propylene, katolite, phosgene, isocyanianes, epichlorohydrine and others. In 33 among 50 examinees (66 p.c.) the authors detected a normal record of VEP. A pathological record was observed in 17 persons (34 p.c.). The greatest per cent of pathological records concerned a group of professional practice amounting 20-29 years as well as persons undertaking the work before the 25th year of life. The most frequent pathological record of VEP was a curve with reduced amplitude of the P wave; the least frequently seen was the debasement of the amplitude together with the elongation of the latent time of this wave.