The invention of spectacles and the advent of printing.
Dreyfus
J
J
D001634:Bibliographies as Topic; D004864:Equipment and Supplies / Q000266:history*; D049690:History, Ancient; D049692:History, Early Modern 1451-1600; D049691:History, Medieval; D049711:History, Modern 1601-; D011327:Printing / Q000266:history*; D014786:Vision Disorders / Q000266:history*