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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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Blinking the eyes is, of course, also a reflex.[18] On the other side of the lens is the second humour, the vitreous humour, which, READ ON...
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Such eyes are typically roughly spherical, filled with a transparent gel-like substance called the vitreous humour, with a focusing lens and often an iris which regulates the intensity of the light that enters the eye. The opsin in both opens ion channels on the cell membrane which leads to hyperpolarization, this hyperpolarization of the cell leads to a release of transmitter molecules at the synapse. Eye transplants can happen but the person receiving the transplant
Compound eyes are found among the arthropods and are composed of many simple facets which give a pixelated image (not multiple images, as is often believed). When an observer views an object in motion moving away or towards himself, there is no eye movement occurring as in the examples above, however the ability to discern speed and speed difference is still present; although not as severe. Most of
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