[Southbridge, MA]: American Optical Company, n.d. [ca.1918]. Fourteenth Enlarged edition. Box. A complete set of 71 loose stereoscopic cards + a 4 page printed direction manual, housed in an oblong maroon box, with printed b/w label on the top. The cards are subdivided into 9 grouping, 50 are in b/w, and 21 in color. The set of cards was first compiled in 1890 by Dr. David Wells of MIT, using images originally created by Louis Émile Javal (1839 –1907), Kroll (1899), Dahlfeld, Hale, Keystone, and Bausch & Lomb. The set was first issued by the American Optical Company of Southbridge, MA, in 1912 and designed to cultivate "binocular vision and for treatment of Heterophoria", in optometry patients, using the AO Stereoscope Photometer. The current medical consensus among optometrists is that these non-invasive stereoscopic eye training techniques are not effective in treating these conditions. One subset of cards (E) was designed to by used for testing American aviators.
Box with some light water stains to the label, and some rubbing to extremities. Light abrasions to the text on the top of the box and the sides of the box top. Light sporadic foxing to the text manual as well as a few of the cards. Box in very good-, cards in very good- to very good condition overall. vg- to vg. Item #50621
Bibliographic reference: Raposo, Sara, "Stereoscopic Therapy: Fun of Remedy?" in International Journal of Film and Media Arts vol.1, no.2 pp.52-53.