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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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Rods and cones are both photosensitive, but respond differently to different frequencies of light. Such eyes are typically roughly, READ ON...
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This area is called the fovea, and covers about 2 degrees of visual angle in people.93 millimeters at a distance of one meter.[6] This gradually changed as the eyespot depressed into a shallow "cup" shape, granting the ability to slightly discriminate directional brightness by using the angle at which the light hit certain cells to identify the source. Prey animals and competing predators alike would be forced to rapidly match or exceed any such capabilities
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 detected and converted into electrical signals. Microsaccades move the eye no more than a few degrees per second (Westheimer and McKee, 1954). Though structurally and metabolically similar, their function is quite different. The area of the pupil governs the amount
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3D Glossary: Viewing"
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