The Aging Effect on the Color Perception : Does aged person observe everything yellowrish?

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It has been said that an aged person observes everything yellowish because his lens in the eyeball becomes yellow. I intended to measure the color visual MTF properties of the aged person using a computer display under the financial help of Grand-in-aid for scientific research. The patterns used for the measurement must have no luminance difference but only color (hue) difference. However, if color changes, luminance also changes subordinately. In this paper, luminance is defined as brightness measured by an instrument. On the contrary, brighten sensation of human being is defined brightness. In advance of development color design, luminance of an instrument was confirmed as almost same as brightness of human being by flicker method. Then, in this investigation the luminance was used for speculation. It means color and brightness are determined by calculations. This investigation presents how to design the various colors keeping uniform luminance in a pattern. First method is that defaults values : R (red), G (Green) and B (Blue) in a computer, are initially determined, and then calculate color coordinates under keeping same luminance. Second method is that the most desirable color (color coordinates) are determined, consequently, the defaults values of R, G and B are calculated under the keeping same luminance.Using these determined colors, color MTF propensities were measured for an aged person in comparison with young subjects and concluded that there is no different in color vision among them.