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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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Similarly, while moving, the ability is further diminished unless there is another point of reference for determining speed; however, READ ON...
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The eyes of cephalopods, fish, amphibians, and snakes usually have fixed lens shapes, and focusing vision is achieved by telescoping the lens—similar to how a camera focuses. Though structurally and metabolically similar, their function is quite different. For example, birds of prey have much greater visual acuity than humans, and some can see ultraviolet light.[12] The sclera gives the eye most of its white color. Hence, a dynamic contrast ratio of about 1,000,000:1
A Snellen chart is one type of eye chart used to measure visual acuity. While there are many changes of significance in the nondiseased eye, the most functionally important changes seem to be a reduction in pupil size and the loss of accommodation or focusing capability (presbyopia).The retina has a static contrast ratio of around 100:1 (about 6 1/2 stops). Following an object moving at constant speed
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