Similarly, it is asked, who invented the bifocal spectacles What purpose do they serve?
Bifocals are commonly prescribed to people with presbyopia, a condition that Franklin suffered. Franklin wrote, in August 1784 to his friend George Whatley, that he was “happy in the invention of double spectacles , which serving for distant objects as well as near ones, make my eyes as useful to me as ever they were .”
Beside above, what was the purpose of the bifocal spectacles? Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism.
Similarly, it is asked, why did Benjamin Franklin invented the bifocal spectacles?
Benjamin Franklin (1706-1790), one of the Founding Fathers as well as an author, printer, and scientist, invented bifocals because he suffered from presbyopia, a condition that means “age of sight” and that makes it harder for the eye to adjust to seeing objects at different distances as one ages.
When were the bifocals invented?