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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 does have two points at which it is different; the fovea and optic disc. Full adaptation is dependent on good blood flow; thus, READ ON...
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Even when looking intently at a single spot, the eyes drift around. These eyespots could only sense ambient brightness: they could distinguish light and dark, but not the direction of the lightsource. The first humour is a clear mass which connects the cornea with the lens of the eye, helps maintain the convex shape of the cornea (necessary to the convergence of light at the lens) and provides the corneal endothelium with nutrients. The lens, behind the iris, is a convex,
This placement of the eyes helps to protect them from injury. Rods and cones are both photosensitive, but respond differently to different frequencies of light.[19] Assuming two pixels per line pair (one pixel per line) and a square field of 120 degrees, this would be equivalent to approximately 120×60×1. Separation of the forward layer again forms a humour, the aqueous humour. The optic
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