Effect of Haze of Cataract Eyes to Color Perception of Elderlies

摘要

When people become older it is inevitable to get cataract in their eyes and meet various new inconvenient situations about their visual perception. Change of color perception is one of them. It is caused by the yellowing of the crystalline lens, but more seriously by the haze of crystalline lens which desaturates all the color that they see. In the present paper we investigated the effect of the haze on desaturation by two experiments. Haze goggles with six different haze values were made to simulate different degree of cataract and used to judge color outdoors. In Experiment 1 the color of various objects such as tree leaves and signs at far distance was judged whether the color is perceived. With increase of haze value the colors gradually desaturated and finally faded out. The observers could not tell what colors they were. In Experiment 2 fourteen colored charts were used in stead of normal objects and the distance limit over which their colors became unperceivable was measured. The distance became shorter for heavier haze goggles because of desaturation of color of the test colored charts.