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Ability to determine visually the distance between objects.

We can determine the relative distance of objects in two different ways. One uses cues involving only one eye; the second requires two eyes. When something is far from us, we rely on monocular cues, those that require the use of only one eye. For closer objects, we use both monocular cues and binocular cues, those that necessitate both eyes.

The ability to perceive depth seems to exist early in life. Research with infants has revealed that by two months of age, babies can perceive depth. Prior to that, they may be unable to do so in part because of weak eye muscles that do not let them use binocular depth cues.

Monocular Depth Cues. Psychologists have identified two...