title: Armaignac's 1906 paper on the recording of visual acuity and the progression of letter sizes on visual acuity charts.
abstract: BACKGROUND
  Henry Armaignac, a French ophthalmologist in the early twentieth century, criticized the Monoyer optometric scale, which was used to measure visual acuity.
  
  
  METHODS
  This article discusses the "optometric scale" for visual acuity letter sizes proposed by Armaignac in a 1906 publication.
  
  
  CONCLUSIONS
  Armaignac pointed out the flaws of the Monoyer visual acuity chart commonly used in France at the time and suggested an improvement in the progression of letter sizes on the chart.
authors.affiliation: School of Optometry, Indiana University, Bloomington, USA.
authors.forename: D A
authors.initials: DA
authors.lastname: Goss
mesh_terms: D004867:Equipment Design / Q000266:history; D005602:France; D049673:History, 20th Century; D006801:Humans; D014787:Vision Tests / Q000266:history* / Q000295:instrumentation; D014792:Visual Acuity