Your Eye Cares
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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Take for example, when watching a plane while standing — the plane has normal visual speed. Because cone cells are all that exist directly, READ ON...
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This ensures that individual photosensitive cells are continually stimulated in different degrees. The choroid gives the inner eye a dark color, which prevents disruptive reflections within the eye. Most of the light refraction occurs at the cornea which has a fixed curvature. As the eye ages certain changes occur that can be attributed solely to the aging process. Such eyes are typically roughly spherical, filled with a transparent gel-like substance called the vitreous
Formation of a nontransparent ring allows more blood vessels, more circulation, and larger eye sizes. Its requirement for high intensity light does cause problems for astronomers, as they cannot see dim stars, or other objects, using central vision because the light from these is not enough to stimulate cone cells. Cycles per degree (CPD) measures how much an eye can differentiate one object from another
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