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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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The fovea is a dip in the retina directly opposite the lens, which is densely packed with cone cells. The transparent protective cells, READ ON...
Eye Care Knowledge Base
Its requirement for high intensity light does cause problems for astronomers, as they cannot see dim stars, or other objects, using central vision because the light from these is not enough to stimulate cone cells. For this reason red, green and blue are called primary colors and the colors obtained by mixing two of them, secondary colors. A Snellen chart is one type of eye chart used to measure visual acuity.[18] On the other side of the lens is the second humour, the vitreous
Compound eye of Antarctic krill. They used clear calcite crystals to form the lenses of their eyes. Though structurally and metabolically similar, their function is quite different. No photosensitive cells whatsoever exist at this point, it is thus "blind". Formation of a nontransparent ring allows more blood vessels, more circulation, and larger eye sizes. Such eyes are typically roughly spherical, filled with a transparent gel-like substance called the vitreous
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