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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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A diopter is the unit of measure of optical power. Such eyes are typically roughly spherical, filled with a transparent gel-like substance, READ ON...
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One form is broken down by the particular EM wavelength that is red light, another green light, and lastly blue light. 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. In simple terms, this allows human beings to see red, green and blue light. These eyespots could only sense ambient brightness: they could distinguish light and dark, but not the direction of the lightsource.
* The nervous tunic, also known as the retina at the rear of the eye, where the light is sufficient to stimulate cells, allowing the individual to observe distant stars. In comparison to younger people, it is as though older persons wear medium-density sunglasses in bright light and extremely dark glasses in dim light. The optic disc, sometimes referred to as the anatomical blind spot, is a point on the retina
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