1. Beiträge zur Kenntniss der Refractions- und Accommodationsanomalien Author(s): Donders, F. C. (Franciscus Cornelis), 1818-1889, author Publication: [Berlin] : [publisher not identified], [1860?] Subject(s): Eye DiseasesRefractive ErrorsAsthenopia
2. Eye-strain: its bearings upon the duration of human life Author(s): Ranney, Ambrose L. (Ambrose Loomis), 1848-1905, author Publication: [New York?] : [publisher not identifed], [1889?] Subject(s): AsthenopiaRefractive ErrorsNeurologic Manifestations
