CRISTINA PEDRAZZINI / SCIENCE PHOTO LIBRARY CRISTINA PEDRAZZINI / SCIENCE PHOTO LIBRARY
Red/blue glasses used to produce 3D or stereoscopic vision. The glasses work by using the red and blue filters to provide each eye with a different image. The brain then combines the two images to form a three-dimensional image. This has the disadvantage of producing monochrome images. Other 3D viewing methods include stereoscopes and polarised filters.
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