binocular disparity

noun
  1. physiol the small differences in the positions of the parts of the images falling on each eye that results when each eye views the scene from a slightly different position; these differences make stereoscopic vision possible
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012