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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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Some insect larvae, like caterpillars, have a different type of simple eye (stemmata) which gives a rough image. Compound eyes are, READ ON...
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[6] This gradually changed as the eyespot depressed into a shallow "cup" shape, granting the ability to slightly discriminate directional brightness by using the angle at which the light hit certain cells to identify the source.The eyes can also follow a moving object around. Rod cells are highly sensitive to light allowing them to respond in dim light and dark conditions, however, they cannot detect color.[19] Assuming two pixels per line pair (one pixel per
This placement of the eyes helps to protect them from injury. night vs. In one degree, a human would not be able to see while moving, the ability is further diminished unless there is another point of reference for determining speed; however the inaccuracy of speed or speed difference will always be present. As soon as the eye moves (saccades) it re-adjusts its exposure both chemically and by adjusting
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