Stereoscopy
![Pocket stereoscope with original test image. Used by military to examine stereoscopic pairs of aerial photographs.](/Images/godic/202502/13/Pocket_stereoscope2822.jpg")
![View of Boston, c. 1860; an early stereoscopic card for viewing a scene from nature](/Images/godic/202502/13/Charles_Street_Mall,_Boston_Common,_by_Soule,_John_P.,_1827-1904_32822.jpg")
![Kaiserpanorama consisted of a multi-station viewing apparatus and sets of stereo slides. Patented by A. Fuhrmann around 1890.[1]](/Images/godic/202502/13/August_Fuhrmann-Kaiserpanorama_18802822.jpg")
![Company of ladies watching stereoscopic photographs, painting by Jacob Spoel, before 1868. A very early depiction of people using a stereoscope.](/Images/godic/202502/13/Company_of_ladies_watching_stereoscopic_photographs_by_Jacob_Spoel_1820-18682822.jpg")
Stereoscopy (also called stereoscopics) is a technique for creating or enhancing the illusion of depth in an image by means of stereopsis for binocular vision. The word stereoscopy derives fromGreekστερεός (stereos), meaning "firm, solid",andσκοπέω (skopeō), meaning "to look, to see". Any stereoscopic image is called a stereogram. Originally, stereogram referred to a pair of stereo images which could be viewed using a stereoscope.