title: Benjamin Franklin, F.R.S., Sir Joshua Reynolds, F.R.S., P.R.A., Benjamin West, P.R.A. and the invention of bifocals.
authors.forename: J R
authors.initials: JR
authors.lastname: Levene
mesh_terms: D049711:History, Modern 1601-; D009885:Ophthalmology / Q000266:history*; D006113:United Kingdom; D014481:United States