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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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The iris, between the lens and the first humour, is a pigmented ring of fibrovascular tissue and muscle fibres. Some of the simplest eyes, called ocelli, can be found in animals like snails, who cannot actually "see" in the normal sense.[8] The gap between tissue layers naturally formed a bioconvex shape, an ideal structure for a normal refractive index. The differences are useful; apart from enabling sight in both dim and light conditions, humans have
The transparent protective cells eventually split into two layers, with circulatory fluid in between that allowed wider viewing angles and greater imaging resolution, and the thickness of the transparent layer gradually increased, in most species with the transparent crystallin protein. This results in the high visual acuity, or the high ability to distinguish between detail, of cone cells and not rods. Rhodopsin,
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