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Different kinds of light sensitive organs are found in a variety of organisms. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors. The visual fields of some such complex eyes largely overlap, to allow better depth perception, as in humans; and others are placed so as to minimize the overlap, such as in rabbits and chameleons.
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If, for example, the red and green cones are stimulated to the same, READ ON...
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If, for example, the red and green cones are stimulated to the same extent, and no blue cones are stimulated, yellow is seen. For this reason red, green and blue are called primary colors and the colors obtained by mixing two of them, secondary colors. Full adaptation is dependent on good blood flow; thus dark adaptation may be hampered by poor circulation, and vasoconstrictors like alcohol or tobacco. While there are many changes of significance in the nondiseased eye,
Other animals have other ranges, with many such as birds including a significant ultraviolet (shorter than 400 nm) response. Some insect larvae, like caterpillars, have a different type of simple eye (stemmata) which gives a rough image. Hence, a dynamic contrast ratio of around 100:1 (about 6 1/2 stops). In some animals, the retina contains a reflective layer (the tapetum lucidum) which increases the amount
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