Historical image: Helmholtz ophthalmoscope, 1851.
D005858:Germany; D049672:History, 19th Century; D009885:Ophthalmology / Q000266:history*; D019721:Ophthalmoscopes / Q000266:history*; D009887:Ophthalmoscopy / Q000266:history*; D010825:Physics / Q000266:history