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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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Independently, a transparent layer and a nontransparent layer split forward from the lens: the cornea and iris. Cycles per degree (CPD), READ ON...
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Without changing input, these cells would otherwise stop generating output. Rod cells contain the protein rhodopsin and cone cells contain different proteins for each color-range. The smooth pursuit movement can move the eye at up to 100°/s in adult humans. The process through which these proteins go is quite similar—upon being subjected to electromagnetic radiation of a particular wavelength and intensity, the protein breaks down into two constituent products. At the conclusion of an eye examination, an eye doctor may provide the patient with
Initial dark adaptation takes place in approximately four seconds of profound, uninterrupted darkness; full adaptation through adjustments in retinal chemistry (the Purkinje effect) are mostly complete in thirty minutes. For example, birds of prey have much greater visual acuity than humans, and some can see ultraviolet light. The vitreous gel undergoes liquefaction (posterior vitreous detachment or PVD) and its opacities—visible as floaters—gradually increase in number.
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