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Stereoscopy (also called stereoscopic or 3-D imaging) refers to a technique for creating or enhancing the illusion of depth in an image by presenting two offset images separately to the left and right eye of the viewer.

Both of these 2-D offset images are then combined in the brain to give the perception of 3-D depth.

Three strategies have been used to accomplish this:

  1. Have the viewer wear eyeglasses to combine separate images from two offset sources (Stereopsis)
  2. Have the viewer wear eyeglasses to filter offset images from a single source separated to each eye
  3. Have the lightsource split the images directionally into the viewer’s eyes (no glasses required)

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