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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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Its requirement for high intensity light does cause problems for astronomers, as they cannot see dim stars, or other objects, using, READ ON...
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In many species, the eyes are inset in the portion of the skull known as the orbits or eyesockets. Rod cells are highly sensitive to light allowing them to respond in dim light and dark conditions, however, they cannot detect color.[14][17] Within the anterior segment are two fluid-filled spaces: the anterior chamber and the posterior chamber. The differences are useful; apart from enabling sight in both dim and light conditions, humans have given them further application.
Initial dark adaptation takes place in approximately four seconds of profound, uninterrupted darkness; full adaptation through adjustments in retinal chemistry (the Purkinje effect) are mostly complete in thirty minutes. It can be reversed by irrigating the eye with hypertonic saline which osmotically draws the excess water out of the window in a moving train, the eyes can focus on a 'moving' tree for a short
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