Word: binoculars
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...movies first got excited about color in the early 1930s, but the single camera, projecting a single picture, lacked binocular vision. It saw the scene as a one-eyed man sees...
...Binocular Cameras. Two camera lenses can approximate the two human eyes. They take two pictures of the scene from slightly different angles. Both pictures are thrown on the same screen, and the viewers are given means of seeing only one of them with each eye. The trick is worked with polarized light...
...viewers get glasses with lenses of Polaroid plastic. One lens passes light from the screen that is polarized vertically. The other passes light polarized horizontally. Thus each eye sees only one of the pictures. Since each eye sees the scene from a slightly different angle, as in natural binocular vision, objects appear to have definite distance...
Peripheral Vision. Besides binocular vision, human eyes have another ability that conventional movies lack: they see a much wider field. A man with normal vision can see about 200°, while the ordinary movie camera sees 35°. Actually, the eyes see most of their field in a vague way. Only the center is sharp and detailed. The purpose of "peripheral vision" (the rest of the field) is to tell the eyes what to look at. When some interesting object appears "in the corner of the eye," a quick movement shifts it to the center of vision. In conventional movies...
...disclose exact technical details. But film executives who viewed his work pronounced it good. Heart of the device is a prism composed of two paper-thin sheets of glass fitted together at a 45° angle. This is inserted behind the camera's lens, works something like the binocular vision of human eyes. The illusion of roundness goes onto the film so that no special projector equipment is necessary and spectators do not have to wear stereoscopic glasses...