Stereopsis

Stereopsis is the sensation, produced by the visual system, that objects in a scene extend into depth and lie at different distances from one another and from the observer. Humans experience it chiefly through two mechanisms: binocular depth vision, which compares the slightly different images each eye receives from its own vantage point, and motion based depth cues such as optical flow and parallax that arise as the observer moves. The word comes from the Greek stereos, meaning solid, and opsis, meaning appearance or sight. Binocular stereopsis itself operates at two levels: fine stereopsis, which supports recognizing shapes and objects, and coarse stereopsis, which supports locating things in space. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/