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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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. Compound eyes are found among the arthropods and are composed of many simple facets which give a pixelated image (not multiple images, as is often believed).The posterior segment is the back two-thirds of the eye that includes the structures in front of the vitreous humour: the cornea, iris, ciliary body, and lens.7 millimeters wide. The size of the pupil is actively adjusted by the circular and radial muscles to maintain a relatively constant level of light entering
This is the reason why cones and rods enable organisms to see in dark and light conditions—each of the photoreceptor proteins requires a different light intensity to break down into the constituent products.[8] The gap between tissue layers naturally formed a bioconvex shape, an ideal structure for a normal refractive index. These eyespots could only sense ambient brightness: they could distinguish light
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