This refers to the slight difference in two retinal images due to angle from which each eye views an object.
Convergence: This is another binocular cue where your brain calculates how much your eyes must turn inward in order for you see an object clearly.
Stereopsis: It's a term used for describing perception of depth and 3-dimensional structure obtained on basis of visual information deriving from two eyes by individuals with normally developed binocular vision.