A STUDY OF METHOD FOR DISCERNABLE EXTERIOR COLOR SELECTION FOR ELDERLY PEOPLE WITH YELLOWING VISION

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Both the number and proportion of older people are increasing in the population of Japan. Therefore, an overwhelming majority of older people can easily manage in the community when given appropriate social supports. One of these support system is environmental or architectural barrier free design, especially, clear sign colors and intensive interior or exterior color design for the aged vision.Aging is a lifelong process beginning from the moment we are born. In each stage of the life cycle there are normal and irreversible physical changes, which are not related to accident or disease. A person experiences normal sensory changes. The failure of vision with age results from changes in the eye itself. Three major changes affecting vision begin to occur in the mid-fifties. The lens of the eye becomes increasingly rigid and opaque. It also gradually yellows and by this or other reasons the color vision of the aged changes. In former papers, we investigated Japanese old adults for their yellowing and clouding of the lens resulting in vision problems, i.e. the loss in one's ability to discern color intensities clearly ; and selected films to simulate age-related yellowing levels. In this paper, we investigated open space, such as pedestrians' way and parks, where elderly people come frequently and colorimetried paving. And also we colorimetried 93 marketable exterior paving colors' samples and 460 color charts for architectural design. After analyzing those colors in the color distribution of the xy-chromaticity diagram, we concluded that safe and healthy color selections could be possible, because mutual brightness contrasts are effectively discerned.