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