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Benjamin
Franklin was born in 1706 in Boston, Massachusetts to a family of 17
children and two hard-working parents. He grew to become a master of
many trades. Franklin was a printer, a publisher, a civic leader, a
statesman and a scientist. Franklin vital figure in American
history.
Benjamin
Franklin created the first bifocals to wear. C. Hertel of Germany
made the first bifocal test lens in 1716. It is doubtful that
Franklin knew of Hertel’s test lens when he created actual, wearable
bifocals. Franklin split two lenses of different strengths (one for
far and one for near) and fused them together. Patients needed a
certain amount of adjustment time to see properly through bifocals,
but after that the results were excellent for the time period. |
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