Catalogue Number: 3198
American Optical Monocular Indirect Ophthalmoscope Model 11305
Designer/inventor: George F Schenk & Milton H Sussman
Year Of Publication/Manufacture: c1972
Time Period: 1940 to 1999
Place Of Publication/Manufacture: Buffalo, New York, USA
Publisher/Manufacturer: American Optical Corporation
Description Of Item: Monocular indirect ophthalmoscope (MIO) Model 11305 with coiled lead and AO transformer/voltage selector Model 11457. Instrument of metal, glass and plastic, with sliding lens cover and continuously variable focus. Marked on base:'MADE IN U.S.A. SERIAL NO AL1497 MODEL 11305. Dimensions of instrument: 190 x 132 x 35 mm.
Historical Significance: This instrument was used by John Nathan. The Patent Application was filed on 13 September 1968, and the patent No US3586424 was published on 22 June 1971, copy in Archive Office Patent File. The patent was assigned to the American Optical Corporation. The MIO quickly became popular and was widely adopted in the 1970's having the advantages of an erect image, a wide field of view and ease of examining eyes with small pupils. The AO MIO is illustrated in American Optical promotional brochures from 1969, see Cat No 1781.
How Acquired: Donated by John Nathan
Date Acquired: Jan 2017
Condition: Good but missing forehead rest.
Location: Archive room. West wall. Unit 6 Drawer 3