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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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The retina has a static contrast ratio of around 100:1 (about 6 1/2 stops).When a creature with binocular vision looks at an object,, READ ON...
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6 minute of arc per line pair, or 1. These eyespots could only sense ambient brightness: they could distinguish light and dark, but not the direction of the lightsource. Its requirement for high intensity light does cause problems for astronomers, as they cannot see dim stars, or other objects, using central vision because the light from these is not enough to stimulate cone cells. These include myopia, hyperopia, and astigmatism. If all three forms of cones are stimulated
Eye transplants can happen but the person receiving the transplant will not be able to see. However, if an observer watches the plane while moving in the same direction as the plane's movement, the plane will appear as if it were standing still or moving very slowly. These changes contribute to the etiology of several eyelid disorders such as ectropion, entropion, dermatochalasis, and ptosis. When the muscles
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