Accessories — 29 May 2012

Reading stones from 1000 AD
1268 Roger Bacon discussed possibilities of magnification with lenses

1284 Salvino D’Armate built the first spectacles which were used as reading glasses

1451 Nicholas of Cusa uses negative lenses to cure myopia (nearsightedness)

1604 Kepler describes the optics of near and far sightedness

1748: Benjamin Franklininvents the bifocal lens

1827: Sir George Biddel Airy invents spectacles for astigmatism

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