Benjamin Franklin in America is usually regarded as the inventor of the Bifocal glasses .
My gran has some bifocal glasses.
Bifocal
Benjamin Franklin
The inventor of the bifocal glasses was Benjamin Franklin.
They were created in 1784.
no
1784
in his bedroom
No, you cannot change the bifocal prescription on glasses without changing the lens. The lens is what is prescribed by your eye doctor. The frame, however, can be changed.
One invention is bifocal glasses
He invented bifocal glasses.