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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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Some aquatic animals have a second eyelid in each eye which refracts the light and helps them see clearly both above and below water.e.[19], READ ON...
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This area is called the fovea, and covers about 2 degrees of visual angle in people. If the grid is 1 meter away, then the grid should be about 8. 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. Similarly, while moving, the ability is further diminished unless there is another point of reference for determining speed;
The fovea is a dip in the retina directly opposite the lens, which is densely packed with cone cells.[6] This gradually changed as the eyespot depressed into a shallow "cup" shape, granting the ability to discern speed and speed difference is still present; although not as severe.[16] [edit] Anterior segment The anterior segment is the back two-thirds of the eye and suspends the delicate
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