See also stereoscopic vision
stereoscope - Computer Definition
A handheld viewer that provides the illusion of a 3D image by using two 2D images (stereo images). Dating back to the 1890s and only for still images, stereoscopes were the first attempts at going beyond 2D. For more details about 3D, see 3D visualization, anaglyph 3D, polarized 3D, active 3D, lenticular 3D, parallax 3D and 3D glasses.