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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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[6] This gradually changed as the eyespot depressed into a shallow "cup" shape, granting the ability to slightly discriminate, READ ON...
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They can distinguish between light and dark, but no more. Cone cells, conversely, need high light intensities to respond and have high visual acuity. If, for example, the red and green cones are stimulated to the same extent, and no blue cones are stimulated, yellow is seen. In many animals, including humans, eyelashes prevent fine particles from entering the eye. For example, birds of prey have much greater visual acuity than humans, and some can see ultraviolet light. It
They both contain different pigmented photoreceptor proteins. It lets light through without refraction, helps maintain the shape of the eye and maintain its shape. They used clear calcite crystals to form the lenses of their eyes. Having two eyes is an added complication, because the brain must point both of them accurately enough that the object of regard falls on corresponding points of the two retinas;
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