[Role of visible irradiation in industrial medicine].

Modern norms regulating illumination levels of working surfaces do not consider changes in functional state of vision. Experimental studies involving examinees helped to set optimal levels of brightness for light entering eyes in complicated visual work. If larger object viewed, brightness of the working surface could be lowered to values that do not decrease visual efficiency. The data obtained enabled to justify allowable brightness levels in accordance with complexity of visual tasks. Regulation of visible light according to brightness values appears to be more adequate for visual functions.