title: Historical roots of 20/20 as a (wrong) standard value of normal visual acuity.
authors.affiliation: Department of Ophthalmology, School of Medicine of Ribeiráo Preto, University of São Paulo.
authors.forename: A A
authors.initials: AA
authors.lastname: Velasco e Cruz
mesh_terms: D005260:Female; D049672:History, 19th Century; D006801:Humans; D009885:Ophthalmology / Q000266:history; D012015:Reference Standards; D014792:Visual Acuity