title: John Frederick William Herschel on testing for astigmatism in 1845.
authors.affiliation: School of Optometry, University of California, Berkeley 94720.
authors.forename: J M
authors.initials: JM
authors.lastname: Enoch
authors.forename: R F
authors.initials: RF
authors.lastname: Heitz
authors.forename: V
authors.initials: V
authors.lastname: Lakshminarayanan
mesh_terms: D001251:Astigmatism / Q000175:diagnosis*; D004739:England; D049672:History, 19th Century; D009885:Ophthalmology / Q000266:history