The Bifocals by Benjamin Franklin in 1784.
bifocals?
The very first eyeglasses were invented in 1286, but many later developments were made that improved on the initial designs. Benjamin Franklin invented bifocals, glasses with two distinct optical powers, and George Airy invented lenses correcting astigmatism.
Ben Franklin, they are called bifocals
bifocals were invented on the 300th block of Market street in Philadelphia
Benjamin Franklin is credited with creating the first bifocal eyeglasses.
ben Franklin invented his bifocals at his house in philly and made them on March 23.1784
Salvino D'Aramto invented the eyeglasses in 1284.
Benjamin Franklin invented the bifocals
George Constant Louis Washington, not the president of the United States, is fabled to have invented bifocals. However Benjamin Franklin invented bifocals on May 23, 1785.
Benjamin Franklin invented quite a lot of things of which few are listed below: 1. Bifocals 2. Light bulb 3. Odometer 4. Lighting rod etc.
On eyeglasses? Two lenses = bifocals Three lenses = Trofocals