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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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A horse can resolve about 17 CPD (0.Each eye has six muscles that control its movements: the lateral rectus, the medial rectus, the, READ ON...
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It is not in itself a unique form of eye movement.The structure of the mammalian eye can be divided into three main layers or tunics whose names reflect their basic functions: the fibrous tunic, the vascular tunic, and the nervous tunic. Initial dark adaptation takes place in approximately four seconds of profound, uninterrupted darkness; full adaptation through adjustments in retinal chemistry (the Purkinje effect) are mostly complete in thirty minutes. Under normal conditions,
25 = 9000 pixels in each of the X and Y dimensions, or about 81 megapixels. They both contain different pigmented photoreceptor proteins. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors. Some insect larvae, like caterpillars, have a different type of simple eye (stemmata) which gives a rough image. It is essentially
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