Luckiesh, Matthew, b. 1883 · New York, D. Van Nostrand company · leaf 131
CHAPTER VI COLOR AND VISION 33. The Eye. —Color vision is not essential, because achromatic vision serves the totally color- blind person well. However,_the_ability to perceive colors extends the _usefulne§^ of JtEji!__sense^of sight^very ^"uch. It not only adds greatly to our ^iea^ttre-^lJur… … 'lhfwt:";f'^^^"°'^°' tached from the wall. The radii of curvature, thickness, and refractive index of the various eye media as determined by Helmholtz ^ are given in Table IX. The normal eye, while being a wonderfully adapt- able instrument, is not free from errors, owing to the fact that it is…
Color
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