True stereopsis is perceived due to the following -: (A) Overlay of contours, (B) Motion parallax, (C) Bi- nasal disparity, (D) Linear perspective
Answer is C. Stereopsis is a term that is most often used to refer to the perception of depth and 3-dimensional structure obtained on the basis of visual information deriving from two eyes by individuals with normally developed binocular vision. It is used for binasal disparity Ref khurana 6/e p456