History. Benjamin Franklin is generally credited with the invention of bifocals. He decided to saw his lenses in half so he could read the lips of speakers of ...

10 мая 2024 г. · In a letter dated May 23, 1785, Benjamin Franklin reveals his design for what would later be called bifocal glasses.

Benjamin Franklin, who died 200 years ago, is generally credited with the invention of bifocals. However, serious historians have from time to time produced ...

In 1824, Peter Williams came up with the name “bifocals” for this type of corrective eyewear. Williams would later be credited with the invention of trifocal ...

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 ...

Franklin invented glasses that could be used in regular life and as an aid to reading. With this invention, the first bi-focal glasses were invented.

Patented by Benjamin Franklin in 1784, bifocal lens technology saw relatively few advances over the next 175 years. The bifocal lens with its two parts--the ...

Benjamin Franklin, who died 200 years ago, is generally credited with the invention of bifocals. However, serious historians have from time to time produced ...

The American scientist Benjamin Franklin invented bifocals . Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed.

Some major discoveries of Benjamin Franklin are 1. Bifocal spectacles 2. Glass armonica 3. Lightning rod 4. Street lamps 5. Odometer 6. Flexible urinary ...