4
The lens and perspective
Perception and depth
The eye/brain judges depth by binocular cues (available to two eyes) and monocular cues (available to one eye). Because the eyes are about 6 cm apart the retinas of the eyes receive slightly different images. It is the comparison of these two images and by movement of the head that information about depth is achieved with binocular vision. The short fashion for three-dimensional films in the 1950s replicated stereoscopic vision by having two overlapping images forming the projected image that were separated when viewed by green and red spectacles. Apart from this fashion, a television or film shot is a ‘one-eyed’ system and indications of depth are achieved by:
relative size of known objects ...
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