Plain English Meaning

Visual clues your brain uses to judge distance that work with just one eye open — things like how big something looks, whether it blocks something else, and how hazy it appears.

Full Definition

Visual depth and distance indicators that can be perceived using only one eye. Monocular cues include relative size, overlap (interposition), texture gradient, linear perspective, aerial perspective (haze), light and shadow, and motion parallax. Pilots rely on these cues to judge distance to terrain, runways, and other aircraft, especially at ranges where binocular vision is no longer effective.

Context Anchor

Seen in discussions of distance estimation and depth perception, especially when judging , terrain, , or by sight.