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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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It consists of dense connective tissue filled with the protein collagen to both protect the inner components of the eye and maintain its, READ ON...

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Independently, a transparent layer and a nontransparent layer split forward from the lens: the cornea and iris. Full adaptation is dependent on good blood flow; thus dark adaptation may be hampered by poor circulation, and vasoconstrictors like alcohol or tobacco.[1] Trilobites, which are now extinct, had unique compound eyes. They can distinguish between light and dark, but no more. The smooth pursuit movement can move the eye at up to 100°/s in adult humans. It can also

[1] Trilobites, which are now extinct, had unique compound eyes. There are other refraction errors arising from the shape of the cornea (necessary to the convergence of light at the lens) and provides the corneal endothelium with nutrients. Cone cells, conversely, need high light intensities to respond and have high visual acuity. Most of the light that enters the eye.The visual system in the brain is

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The Human Eye: Structure and Function - Sinauer Associates, Inc.

The Human Eye: Structure and Function Clyde W. Oyster, University of Alabama, Birmingham. 1999 766 pages, 575 illustrations paper About This Title. We are a highly visual species.

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