p141fig04.18 The images formed on the two retinas in response to a single object in the world are displaced by different amounts with respect to their foveas.  This binocular disparity is a powerful cue for determining the depth of the object from an observer.<BR>|| Binocular Disparity.  Binocular disparities are used in the brain to reconstruct depth from 2D retinal inputs, for relatively near objects.