Binocular vs. monocular depth cues
Which depth cue requires input from both eyes?
Answer B: explanation for every choice
A
Linear perspective, parallel lines appearing to converge with distance, works with one eye.
B
Correct. Each eye sees a slightly different image, and the brain uses the difference to judge depth.
C
Relative size, smaller images seeming farther away, works with one eye.
D
Motion parallax, nearby objects seeming to move faster than distant ones as you move, works with one eye.
TakeawayBinocular cues: retinal disparity and convergence. Perspective, size, interposition, and motion parallax are monocular.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID ps30.