Davidson type Optometer, apparatus for ophthalmic testing, unsigned, British, c.1880. Consists of two mahogany discs rotating on axis and having lenses mounted on the periphery, mounted on a brass stand, (one lens lacking) Davidson type Optometer 1875-1885
Optometer (sight testing apparatus) to design of John Couper (Ophthalmic surgeon) made by Curry & Paxton, 195 Great Portland Street, London W, c.1890. Optometer (sight testing apparatus) to design of John Couper 1885-1895
Optometer, engraved "Optometre de Maurice Perrin and Mascart, S.Maw Son and Thompson, London, E.C., in box 10 3/8"x5 7/8"x3", no key, c.1880. Optometer, engraved "Optometre de Maurice Perrin and Mascart 1875-1885