Distance Estimation and Depth Perception

14 May 2000

ACES ATTACK!

Cues

•Binocular.

–Depend on the slightly different view each eye has of an object. These cues are only of value when the object is close enough to be viewed differently by each eye. Therefore, since this is often not the case within aviation, binocular cues are not discussed.

•Monocular…


	The cues to distance estimation and depth perception are easy to recognize when aircrew members use central vision under good illumination. As the light level decreases, their ability to judge distance accurately is degraded and their eyes are more vulnerable to illusions. Aircrew members can better judge distance at night if they understand the mechanisms of and cues to distance estimation and depth perception. Distance can be estimated by using individual cues or by using a variety of cues. Crew members normally use subconscious factors to determine distance. They can more accurately estimate distance if they understand those factors and then learn to look for or be aware of other distance cues. These cues to distance or depth perception may be monocular or binocular.
	Monocular: