| Eye movement is controlled by six muscles that are directly attached to the eyeball. The four rectus muscles form a relatively straight line from their points of origin, while the two oblique muscles approach the surface of the eye at an angle. All the muscles combine to keep the eyeball in nearly constant motion in order to maximize human vision, which is capable of focusing on about 100,000 distinct points in the visual field. These muscles also enable both eyes to focus on the same point simultaneously, thereby creating effective depth perception. |
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