20/20 In Hindsight: The Snellen Eye Chart
Have you ever wondered where that chart with the big E in every eye doctor’s office came from?
History
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A Brief History of Eyeglasses
The first eyeglasses are believed to have been invented between 1268 and 1289. Although there are some who would claim otherwise, glasses are widely accepted as originating in Italy. The inventor, however, is not known. These first spectacles were made of natural crystal, and were handheld due to their weight. Crystal lenses could not be […]