Abstract
Even in the steady work, worker's line of sight is usually directed to various directions from time to time. When the difference in luminance of the visual field before (L1) and after (L2) is not small, his eyes are not in adapted condition to L2 for a considerable time after the shift of viewing direction. In this transition period of time, there happens the deterioration in his visual sensitivity. There occurs serious drop in his visual acuity immediately after the change of visual direction, and gradually it is restored to the normal acuity corresponded to the adaptation luminance L2. In the present stage of lighting evaluation and design, there is no regard to the fact mentioned above.
The purpose of our research is to introduce the dynamic concept in the present steady design of lighting considering the eye movement. In this paper, the results are reported which obtained by the visual acuity tests in the transition stage of adaptation for various combinations of L1 and L2 using uniform luminance field of view. General character can be revealed as to the recovering process of visual acuity.
