Abstract
Visual evaluation for the luminous environment has been investigated customary the condition in which the subject's eyes are perfectly adapted to the given luminous environment. But in the actual conditions, worker's eyes are not always fi xed to his visual task. Usually his line of sight is directed to different directions from time to time, and in consequence, the luminance of his visual field changes abruptly from L1 to L2 together with his eye movement. When L2 differs greatly from L1, his eyes are in transition stage of adaptation for a considerable time after an abrupt change in luminance, andin this period his visual sensitivity is never the same as that in perfectly adapted condition to L2.
Visual evaluation tests were performed in transition stage of adaptation for various combinations of L1 and L2. In this paper, the results of tests with regard to glare sensation in the case of L2>L1, and discomfort in the case of L2<L1 using visual field of uniform luminance are reported. The distinct difference of glare senration from that in steady state proves the necessity of introducing the dynamic concept in evaluation and design of luminous environment.
