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There are different techniques used to create an illusionary 3-D image with the use of lenses:
Autostereoscopic 3-D display adds 3-D depth without glasses.
S3-D displays two offset images and creates a parallax, which produces a lack of equality between a set of eyes and invariably causes a stereoscopic cue to the brain. Because each eye sees something different, parallax causes retinal disparity.There are different levels of retinal disparity, depending on the level of 3-D technology used.
Some television sets can produce a 3-D effect with the use of liquid crystal display (LCD) shutter glasses that produce a stereoscopic image. Only a few high-end TVs can also produce glasses-free 3-D imagery.