Hermann von Helmholtz (1821-1894), the famous German professor of physiology and physics, invented the ophthalmoscope in 1850. For the 150th anniversary of this discovery, which revolutionized the practice of ophthalmology, a commemorative medallic plaquette was issued by the Cogan Ophthalmic History Society. It was struck by the Medalcraft Mint (Green Bay, Wis) in either silver or bronze.
The obverse, Figure 1, depicts the bust of von Helmoltz facing right with the inscription "Hermann von Helmholtz, 1821-1894."
April 2003. Arch Ophthalmol. 2003;121(4):587. doi:10.1001/archopht.121.4.587