[Disorders of color vision in employees of the Masovian Refining and Petrochemical Industries in Płock].

Attention is drawn to the problem of the influence of the petrol derivates on the frequency of acquired dyschromatopsia. It has been observed--on the basis of performed examinations of the color vision by means of the Farnsworth-Munsell's 100-Hue test--that the general numerical index of the faults is increasing proportionally to the period of employment, i.s. the period of the contact of the workers with the derivates of petrol.