ABSTRACT
The perception of depth and distance involves both judging the distance of an object from the people and judging the distance between other objects in the environment. However, accommodation in humans operates across a limited range of distances and the process is relatively slow, it is thought to offer rather imprecise information. Stereopsis refers to the three-dimensional nature of vision that is possible when the people use two eyes rather than just one. The accuracy of the people perception of distance and depth generally depends on the interaction of a number of these cues, and their sensitivity to differences in distance using multiple cues is roughly equal to the sum of the sensitivity for each cue acting separately. Computational theorists have devised algorithms for solving this correspondence problem. However, it is possible to construct artificial situations where cues contradict each other, and therefore cannot be summed.
