Bifocals are used for distance seeing or at close up seeing.
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.
ben Franklin invented his bifocals at his house in philly and made them on March 23.1784
in Washington DC
he invented bifocals
I've read that Benjamin Franklin invented them...
The bifocals were invented in 1784, by Benjamin Franklin, because he had seeing problems, and put two lenses of glass together to magnify his vision.
Bifocals were invented by Benjamin Franklin in the United States around 1784. Franklin designed them to help him see both up close and far away without having to switch between different pairs of glasses.
Benjamin Franklin.
Glasses ...He invented Bifocals .
Benjamin Franklin
Benjamin Franklin is credited with inventing both the bifocals and the lightning rod. He created bifocals to address his presbyopia, a condition that causes difficulty in focusing on close objects, and he invented the lightning rod to protect buildings from lightning strikes by grounding the electrical charge.