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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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No photosensitive cells whatsoever exist at this point, it is thus "blind".The retina has a static contrast ratio of around, READ ON...
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These are then transmitted to the brain via the optic nerve. As for the optic nerve, once it is damaged it cannot be fixed. 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. The vitreous gel undergoes liquefaction (posterior vitreous detachment or PVD) and its opacities—visible as floaters—gradually increase in number.
It is largely responsible for color vision in humans, and enables high acuity, such as is necessary in reading. This area is called the fovea, and covers about 2 degrees of visual angle in people. Prey animals and competing predators alike would be forced to rapidly match or exceed any such capabilities to survive. If the grid is 1 meter away, then the grid should be about 8. The different forms
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