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(Course Logo: Adult walking with cane and holding a child's hand)Designing for the Life Span Segment 3

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Slide 14[D]

Slide 14 Content

Vision and Aging: The human eye has varying degrees of sensitivity to color in light. Red, green and blue photopigmentation in the rods is dispersed over the retina with blue sensitivity being the lowest amount and red being the highest. Blue receptors are also dispersed furthest away from the fovea- making it harder to focus on blue figures. Over time, blue sensitivity diminishes and can disappear.

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Not all colors are perceived with equal clarity. Regardless of age, any human eye will perceive figures in red and green better than in blue. The quantity of red, green and blue photo-pigmentation located in the rods of the eye varies for each color. Red is at 64%, green at 34% and blue is lowest at an astoundingly low 2%.

Photo-pigmentation is dispersed differently for the three hues with red dispersed closest to the fovea and blue dispersed furthest away. Therefore, for any human eye, red and green figures are easier to see than blue figures. Significantly, the human eye loses the ability to perceive the color blue with aging.

Figures in white light are easier to see than any other color because white is a mixture of red green and blue.

With greater uses of electronic media, all text color should be carefully selected with reference to eye physiology.

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