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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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For example, when the head moves to the right, the eyes move to the left, and vice versa. Cone cells, conversely, need high light intensities to respond and have high visual acuity.[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. No photosensitive cells whatsoever exist at this point, it is thus "blind". Some arthropods, including many Strepsiptera,
[edit] Anterior and posterior segments The mammalian eye can also be divided into three main layers or tunics whose names reflect their basic functions: the fibrous tunic, the vascular tunic, and the nervous tunic. Another complication for vision in frontal-eyed animals is the development of a small area of the retina with a very high visual acuity. In many animals, including humans, eyelashes prevent fine
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The Black Eyed Peas have more proof of the ubiquity of "I Gotta Feeling.
Peas 'I Gotta Feeling' hits 6M download mark | NewsOK.com
More Information .FILE - In this May 5, 2010 file photo, U.S.singer Fergie, right, and Will.i.am of the Black Eyed Peas performs at the O2 arena in east London
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NEW YORK -- The Black Eyed Peas have more proof of the ubiquity of "I Gotta Feeling.. NEW YORK -- The Black Eyed Peas have more proof of the ubiquity of "I Gotta Feeling
Peas 'I Gotta Feeling' Downloaded 6 Million Times ...
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