Simulation of Light Efficiency for Aged People and Data-Analysis of an Optimal Illuminance with Aging Models of the Human Lens

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We derived ocular spectral transmittances as a function of age with aging models of the human lens and calculated the age-related change in retinal illuminance of D65, 050, and A-lights. The results show that the retinal illuminance of A-light for a 70-year-old person decreases to approximately 0.75 times that for a 22-year-old, and that the magnification factor in the case of D65-light is as low as 0.75. In addition, we conducted an experiment to measure the optimal illuminance for reading a newspaper under two kinds of fluorescent lamp condition (daylight and incandescence colors) for young and aged subjects. The results indicate that aged subjects needed higher illuminance for the reading task than young subjects. We demonstrate that the analysis with aging models of the human lens can explain the tendency of the difference between young and aged subjects in the experimental results. We believe that our approach in the present study will be useful for making a practical standard concerning comfortable illumination environment for aged people.
社団法人照明学会の論文