1. A report on the percentage of near-sight found to exist in the class of 1880 at Harvard College with some account of similar investigations: An account of the phakometer of Snellen Author(s): Derby, Hasket, 1835-1914, author Publication: Cambridge : Printed at the Riverside Press, 1877 Subject(s): Myopia -- epidemiologyStudentsOphthalmology -- instrumentationSnellen, H. (Herman), 1834-1908.Harvard College (1780- )
