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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 choroid gives the inner eye a dark color, which prevents disruptive reflections within the eye. Its requirement for high intensity light, READ ON...
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The different forms of eyes in, for example, vertebrates and mollusks are often cited as examples of parallel evolution, despite their distant common ancestry. Most creatures will automatically react to a threat to its eyes (such as an object moving straight at the eye, or a bright light) by covering the eyes, and/or by turning the eyes away from the threat. Independently, a transparent layer and a nontransparent layer split forward from the lens: the cornea and
Another complication for vision in frontal-eyed animals is the development of a small area of the retina with a very high visual acuity.The maximum resolution of the human eye itself has only a small spot of sharp vision is easy to test by putting a fingertip on a newspaper and trying to read the text while staring at the fingertip — it is
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