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Who invented bifocal lenses?

Read about the man who invented bifocal lenses and the craftsman who welded the lenses.

Bifocal lenses allow people to correct their vision in two different ways with one set of glasses.[©Jupiter Images, 2009]
©Jupiter Images, 2009
Bifocal lenses allow people to correct their vision in two different ways with one set of glasses.

The man who invented the bifocal lens in 1784 was Benjamin Franklin (1706 - 1790). At that time, the two lenses were joined in a metallic frame.

In 1899, J.L. Borsch welded the two lenses together. One-part bifocal lenses were developed by Bentron and Emerson in 1910 for the Carl Zeiss Company.

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