Development Study of Blue-chromatgram Filters Correcting Age-related Middle-level Yellowing Vision Caused of Interior Colors' Discrimination, Aided by Computer

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While elderly persons look at the daily environment through the yellowing lens of the eye, their failure to discriminate color distinctions increases gradually, and this sensory deterioration may become quite serious for their vision in their daily lives. The object of this study is to develop filters correcting age-related lenticular yellowing vision. This study was held as follows: 1) We selected 50 colors on and inside the borderline of a Blue-Purple chromatogram (wavelength 460-410 nm), after colorimetring 132 blue-red mixed colors from color charts and plotting them in an xy-chromaticity diagram. 2) We added them each two kinds of brightness (Br.100%, 50%) and took them out as filters with a computer connected to a scanner and a color printer. 3) After testing seven kinds of Blue-Yellow mixed color charts used in thesis 1998, covered with each 2) above, we obtained 3 B.P. filters with high brightness correcting age-related lenticular middle level yellow vision, in order to return to each orginal color chromatogram and set in original colors' position line in the xy-chromaticity diagram. 4) However these filters need more bright vision and more different kinds of color tests, we study with a camera because of its light control system, which simulates to human eyes. We analyzed 220 colors in the Concise Manual of Color Names by taking photos of original and with correcting age-related yellowing middle-level filters and comparing their original and returned color positions in the xy-chromaticity diagram. The results showed that all color-brightness ratios nearly returned to each original ratio and 64% at the correcting color-postions returned to each original chromatogram.