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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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Human eyes respond to light with wavelength in the range of approximately, READ ON...
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The pit deepened over time, the opening diminished in size, and the number of photoreceptor cells increased, forming an effective pinhole camera that was capable of slightly distinguishing dim shapes.[19] Assuming two pixels per line pair (one pixel per line) and a square field of 120 degrees, this would be equivalent to approximately 120×60×1. 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
Light must first pass though the centre of the iris, the pupil. The angle of the sharp vision being just a few degrees per second (Westheimer and McKee, 1954). If none are stimulated, black is seen. Hence, a dynamic contrast ratio of about 1,000,000:1 (about 20 stops) is possible. The intensity of light (e.[13] * The vascular tunic, also known as the tunica nervosa oculi, is the outer layer of the
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