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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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Rod cells are highly sensitive to light allowing them to respond in dim light and dark conditions, however, they cannot detect color.[16], READ ON...

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Full adaptation is dependent on good blood flow; thus dark adaptation may be hampered by poor circulation, and vasoconstrictors like alcohol or tobacco. Hence multiple eye types and subtypes developed in parallel. It does have two points at which it is different; the fovea and optic disc.[14] The cornea and lens help to converge light rays to focus onto the retina. This results in the high visual acuity, or the high ability to distinguish between detail, of cone cells and not rods.

Some aquatic animals have a second eyelid in each eye which refracts the light and helps them see clearly both above and below water. It is essentially no different from angular resolution. Some of the simplest eyes, called ocelli, can be found in animals like snails, who cannot actually "see" in the normal sense. During this stage, the eyes move to the left, and vice versa. For example, birds

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