How much do we know about astigmatism?
Grosvenor
Theodore
T
D001251:Astigmatism / Q000266:history*; D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049691:History, Medieval; D006801:Humans; D009907:Optometry / Q000266:history*