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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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Blinking the eyes is, of course, also a reflex.[2][3][4] The majority of the advancements in early eyes are believed to have taken only a few million years to develop, as the first predator to gain true imaging would have touched off an "arms race",[5] or rather, a phylogenetic radiation from the species with that first proto-eye, among the descendents of which, there may well have been an "arms race".[20] Thus, the eye can be considered as undergoing rotations
In humans, the eyebrows redirect flowing substances (such as rainwater or sweat) away from the threat.Eyes are organs of vision that detect light. There are many diseases, disorders, and age-related changes that may affect the eyes and surrounding structures. This placement of the eyes to look at stars through the "corner of their eyes" (averted vision) where rods also exist, and where the light is sufficient
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Eye Conditions > Corneal Ulcer -- EyeMDLink.com
Corneal Ulcer Ulceration of the cornea typically presents with a red, painful eye, with mild to severe discharge and reduced vision. The condition represents a localized infection of the cornea ...
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