De Zeng phorometer

Catalogue Number: 1062
De Zeng phorometer
Category: Equipment
Sub-Category: Refractor Phoropter Phorometer
Year Of Publication/Manufacture: c1920
Time Period: 1900 to 1939
Place Of Publication/Manufacture: Camden, N.J., U.S.A.
Publisher/Manufacturer: De Zeng Standard Co
Description Of Item: Stand model trial frame elaborated with rotary prisms, Maddox Rods & Stevens Phorometer. Adjustable PD & level. Metal, glass, black paint & chrome finish. Stamped: DE ZENG STANDARD Co. CAMDEN N.J. MAKERS. PATENTS PENDING. H: 16.5 cm x W: 23.0 cm
Historical Significance: Henry DeZeng was a prolific inventor of many eye and ear, nose and throat instruments but his first love was the ophthalmoscope. This is reflected in his many patents. He made the first practical electric ophthalmoscope, the first with a non-corrosive mirror, the first with illuminated lens indicating numbers and the first commercially produced ophthalmoscope with a battery contained in the handle. The list goes on, including being the first to use filters, a rheostat and standard commercial lamps. The DeZeng Company became part of American Optical in the early 1920s: Henry ended his career with a flourish, producing the Professional and the wonderfully named Knickerbocker ophthalmoscopes! A second copy is catalogued at # 479. The Museum holds a phorometer made by the American Optical Company (Cat # 1053) under a patent held by Henry L DeZeng. It also holds a DeZeng ophthalmoscope (Cat No 907) and a Wellsworth DeZeng retinoscope. (Cat no 908).
How Acquired: Donated by William Johns, Melbourne optometrist mid 20th C and the inaurual Director of Studies of the College
Condition: Fair
Location: Archive room. West wall. Unit 3 Drawer 5

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