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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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This is made apparent when swimming in freshwater pools, as the osmotic gradient draws "pool water" into the corneal tissue, READ ON...
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As soon as the eye moves (saccades) it re-adjusts its exposure both chemically and by adjusting the iris. Rods and cones are both photosensitive, but respond differently to different frequencies of light. Cow eyes are often stuffed with varieties of coleslaw, beef, and even cream cheese. Some arthropods, including many Strepsiptera, have compound eye composed of a few facets each, with a retina capable of creating an image, which does provide multiple-image vision. The movements
In simple terms, this allows human beings to see red, green and blue light. This enables snails to keep out of direct sunlight. The fovea is a dip in the retina directly opposite the lens, which is densely packed with cone cells. The anterior chamber is the space between the posterior surface of the cornea (i. The differences are useful; apart from enabling sight in both dim and light conditions,
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