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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This area is called the fovea, and covers about 2 degrees of visual angle in people.[12][15] The retina contains the photosensitive rod and cone cells and associated neurons. In humans, the eyebrows redirect flowing substances (such as rainwater or sweat) away from the eye. To maximise vision and light absorption, the retina is a relatively smooth (but curved) layer. With each eye viewing a different angle, a fused image from all the eyes is produced in the brain, providing
The vitreous gel undergoes liquefaction (posterior vitreous detachment or PVD) and its opacities—visible as floaters—gradually increase in number.[12][14][15] The choroid contains blood vessels that supply the retinal cells with necessary oxygen and remove the waste products of respiration. The process is nonlinear and multifaceted, so an interruption by light nearly starts the adaptation process over again.[2][3][4] The majority of the advancements in early eyes are believed to have
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