Because our eyes are set a couple of inches apart, a slightly different image of an object is cast on the retina of each eye. When the two retinal images of an object in view are very different, we perceive that the object is close by, and when the two retinal images are nearly identical, we perceive that the object is far away. This depth perception cue is called:

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This depth perception cue is called binocular disparity, as it refers to the difference in retinal images between the two eyes. The brain uses this difference to create a three-dimensional perception of the world, allowing us to perceive depth and distance.

Because Our Eyes Are Set a Couple of Inches Apart