Development of eyeglasses
- In the 14th century, Venetian craftsmen made eyeglasses. The lenses were convex to correct far-sightedness.
- In 1451 Nicholas of Cusa from Germany produced concave eyeglass for near-sighted people.
- In the 17th century, frames of steel were invented.
- British optician Edward Scarlett invented eyeglasses where the frame could be placed over the ears and nose.
- Benjamin Franklin invented bifocals.
- In 1827, Sir George Biddle Airy invented glasses to correct astigmatism.
- In 1971, a lens was developed which combined plastic with glass.
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