noun. An optical instrument with two eyepieces used to impart a three-dimensional effect to two photographs of the same scene taken at slightly different angles.

noun. An instrument resembling a catheter with a bell-like extremity, used in the diagnosis of stone in the bladder or of bullets and other foreign substances in the body.

noun. An optical instrument illustrating the phenomena of binocularvision, and serving to produce from two nearly similar pictures of an object the effect of a single picture with the appearance of relief and solidity belonging to ordinary vision.

noun. An optical instrument for giving to pictures the appearance of solid forms, as seen in nature. It combines in one, through a bending of the rays of light, two pictures, taken for the purpose from points of view a little way apart. It is furnished with two eyeglasses, and by refraction or reflection the pictures are superimposed, so as to appear as one to the observer.

noun. an instrument used for viewing pairs of stereoscopic photographs

noun. an optical device for viewing stereoscopic photographs

""The first effect of looking at a good photograph through the stereoscope is a surprise such as no painting ever produced," Oliver Wendell Holmes wrote in 1859."

achromatic mirror stereoscope  münsterberg's stereoscope  

optical device  

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