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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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Further, synaptic convergence means that several rod cells are connected to a single bipolar cell. The angle of the sharp vision being just, READ ON...
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This light causes chemical changes in the photosensitive cells of the retina, the products of which trigger nerve impulses which travel to the brain.Rapid eye movement, or REM for short, typically refers to the stage during sleep during which the most vivid dreams occur.[20] Thus, the eye can be considered as undergoing rotations about a single point in the center of the eye. Eyes in various animals show adaptation to their requirements. Because of the smaller pupil size, older eyes
In comparison to younger people, it is as though older persons wear medium-density sunglasses in bright light and extremely dark glasses in dim light. As for the optic nerve, once it is damaged it cannot be fixed. No photosensitive cells whatsoever exist at this point, it is thus "blind". If none are stimulated, black is seen. This is an almost pure rotation, with only about one millimeter of
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