Your Eye Cares
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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Because cone cells are all that exist directly in the fovea, astronomers have to look at stars through the "corner of their eyes", READ ON...
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Compound eye of Antarctic krill. Rod cells contain the protein rhodopsin and cone cells contain different proteins for each color-range. It consists of dense connective tissue filled with the protein collagen to both protect the inner components of the eye and maintain its shape. The vitreous gel undergoes liquefaction (posterior vitreous detachment or PVD) and its opacities—visible as floaters—gradually increase in number.The retina has a static contrast ratio of around 100:1 (about 6 1/2 stops). The transparent protective cells eventually
Once the human eye itself has only a small spot of sharp vision is easy to test by putting a fingertip on a newspaper and trying to read the text while staring at the fingertip — it is very difficult to read text that's just some centimeters away from the eye.[14] The cornea and lens help to converge light rays to focus onto the
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