[Influence of luminous intensity, contrast and color on vision in patients with slight to severe visual defects (author's transl)].

Visual acuity was measured as a function of illuminance (1X; illumination vertical from above) or luminance (cd/m2; illumination of transparent texts from below) for various pathologic alterations of the eye accompanied by a decrease in visual performance (myopia magna with/without retinopathia myopica, astigmatism, senile cataract, aphakia after congenital cataract, macular degeneration, glaucoma etc.) with positive and negative contrast of reading texts. The degree of visual acuity in relation to illuminance or luminance is characteristic for each ocular disease, so that individual adjustment of illumination at the place of work is called for. Visual acuity is not measurably influenced by the color of the light used. Under directed illumination three-dimensional perception is independent of the angle of illumination; under diffuse illumination perception is drastically reduced.