It is an optical device that is used to make photointerpretation. This device consists of two lenses placed at an ideal distance to allow a binocular view of maps which gives a feeling of relief or three-dimensional vision. There are different shapes and sizes. It is a device similar to 3D glasses.
stereoscopes-belonging to the expression : optical apparatus used to produce the sensation of three dimensions or relief, through two flat images of the same object, which, being seen each with one eye, merge into a single-