Herman Snellen (1834–1908)

Dutch ophthalmologist. MD, Utrecht, 1857; chir. Dr, 1858. Assistant physician, Nederlandsch Gasthuis voor behoeftige en minvermogende ooglijders (the Netherlands Hospital for Eye Patients), Utrecht, 1858; chief physician, 1862. Professor of ophthalmology, Utrecht, 1877; rector of the university, 1892. In 1862, developed optotypes, eye charts with different-sized letters to measure visual acuity.