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It is a binocular cue.
The two binocular depth cues are retinal(binocular) disparity and convergence. They help us judge reality by giving us a perception of how far away an object is.
Retinal disparity
A picture that uses the principle of binocular disparity to create the perception of a three-dimensional image is a stereoscopic image. Stereoscopic imaging shows two slightly offset photographs to produce the three-dimensional effect.
disparity