pseudoscope
/ˈs(j)uːdə(ʊ)skəʊp/Physiology and Psychology
noun
A binocular optical instrument for producing a stereoscopic image in which the appearance of depth is reversed by transposing the images seen by the left and right eyes.
Origin
Mid 19th century; earliest use found in Charles Wheatstone (1802–1875), developer of telegraphy. From pseudo- + -scope.