Your Eye Cares
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 lets light through without refraction, helps maintain the shape of the eye and suspends the delicate lens.In most vertebrates and, READ ON...
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These are the cells which allow humans and other animals to see by moonlight, or with very little available light (as in a dark room).[7] The thin overgrowth of transparent cells over the eye's aperture, originally formed to prevent damage to the eyespot, allowed the segregated contents of the eye chamber to specialize into a transparent humour that optimized color filtering, blocked harmful radiation, improved the eye's refractive index, and allowed functionality outside of water. Certain Diseases can come from sexually transmitted diseases
This increases refractive power and again eases circulatory problems. These are then transmitted to the brain via the optic nerve. This is an almost pure rotation, with only about one millimeter of translation. This light causes chemical changes in the photosensitive cells of the retina, the products of which trigger nerve impulses which travel to the brain. Full adaptation is dependent on good blood flow; thus
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