水晶体と瞳孔の年齢変化から導出した高齢者の等価照度換算式

概要

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It is well known that old people generally need brighter illumination in daily life than young people. One of the reasons may be the decrease in retinal illuminance caused by age-related declines of ocular spectral transmittance and pupil response. I introduce a conversion method for calculating an equivalent illuminance which provides an equal retinal effective-illuminance between different ages. The conversion formula is an approximate solution of the equation for retinal effective-illuminance, and is expressed in a simple and convenient style, so it does not require any iteration or complicated calculation to derive the equivalent illuminance. Results calculated using the formula show that a 70-year-old person needs more than twice as much illuminance as a 22-year-old. I believe that this formula relating age and illuminance will be useful for making practical standards concerning comfortable illumination environments for old people, and for investigating the aging mechanisms of human vision.
社団法人照明学会の論文
1999-08-01