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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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Formation of a nontransparent ring allows more blood vessels, more circulation, and larger eye sizes.g. In humans, the eyebrows redirect, READ ON...
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A Snellen chart is one type of eye chart used to measure visual acuity.[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. This is in direct contrast to the situation with cones,
This light causes chemical changes in the photosensitive cells of the retina, the products of which trigger nerve impulses which travel to the brain.[12][15] The retina contains the photosensitive rod and cone cells and associated neurons. The differences are useful; apart from enabling sight in both dim and light conditions, humans have given them further application. Some arthropods, including many Strepsiptera, have compound eye composed of a few facets each, with
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