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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Initial dark adaptation takes place in approximately four seconds of profound, uninterrupted darkness; full adaptation through adjustments, READ ON...
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This placement of the eyes helps to protect them from injury.The optokinetic reflex is a combination of a saccade and smooth pursuit movement. When, for example, looking out of the window in a moving train, the eyes can focus on a 'moving' tree for a short moment (through smooth pursuit), until the tree moves out of the field of vision. Initial dark adaptation takes place in approximately four seconds of profound, uninterrupted darkness; full adaptation through adjustments
. With each eye viewing a different angle, a fused image from all the eyes is produced in the brain, providing very wide-angle, high-resolution images. The area of the pupil is actively adjusted by the circular and radial muscles to maintain a relatively constant level of light entering the eye. The choroid gives the inner eye a dark color, which prevents disruptive reflections within the eye. This is why the darker
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