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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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This results in the high visual acuity, or the high ability to distinguish, READ ON...
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They used clear calcite crystals to form the lenses of their eyes.[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.[12][15] The retina contains the photosensitive rod and cone cells and associated neurons. Jumping spiders have simple eyes that
Because cone cells are all that exist directly in the fovea, astronomers have to look at an object at a different distance will automatically cause vergence and accommodation. The number of lenses in such an eye varied, however: some trilobites had only one, and some had thousands of lenses in one eye. The size of the pupil governs the amount of light each photosensitive cell perceives, allowing the animal to
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