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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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They spread tears on the eyes, which contains substances which help fight bacterial infection as part of the immune system.Compound eye, READ ON...
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2° in adult humans. Though structurally and metabolically similar, their function is quite different. Hence, a dynamic contrast ratio of about 1,000,000:1 (about 20 stops) is possible.[14] The cornea and lens help to converge light rays to focus onto the retina.The visual system in the brain is too slow to process that information if the images are slipping across the retina at more than a few degrees per second (Westheimer and McKee, 1954). For example, when the head
This is made apparent when swimming in freshwater pools, as the osmotic gradient draws "pool water" into the corneal tissue (the pool water is hypotonic), causing edema, and subsequently leaving the swimmer with "cloudy" or "misty" vision for a short period thereafter. They do have photosensitive cells, but no lens and no other means of projecting an image onto these cells. They can distinguish between light and dark, but not the direction
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