1. Involving, producing, or resembling the effects of seeing something as three-dimensional.
2. A reference to a three-dimensional vision or any of various processes and devices for giving the illusion of depth from two-dimensional images or reproductions; such as, of a photograph or motion picture that has depth, as well as height and width.

Stereopsis, or stereoscopic vision, is believed to have an origin in the anatomic and physiological structures of the retinas of the eyes and the visual cortex.

It is present in normal binocular vision because the eyes view objects in space from two points, so that the retinal image patterns of the same object points in space are slightly different in each of the eyes.

1. Visual perception of depth which is a result partly of binocular vision and because the visual stimuli transmitted from each eye goes to both brain hemispheres.
2. The perception of depth, distance, and three dimensionality arising from binocular vision.
3. Vision in which the visual fields of the two eyes are unified.

Sensations from a common object received by the two eyes are superimposed, and as a result of the slight differences in the fields and the superimposition of the fields, the effects of depth and shape of the object are determined.