Depth perception is the
visual ability to perceive the world in three
dimensions. It is a trait common to many higher
animals. Depth perception allows the beholder to accurately gauge the distance to an object. In modern terminology,
stereopsis is depth perception from
binocular vision through exploitation of
parallax. Depth perception does indeed rely primarily on binocular vision, but it also uses many other monocular cues to form the final integrated perception. There are monocular cues that would be significant to a "one-eyed" person, and more complex inferred cues, that require both eyes to be perceiving stereo while the monocular cues are noted. This "third" group relies on processing within the brain of the person, as they see a full field of view with both eyes.
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