Bifocal lenses were invented by Benjamin Franklin in the 18th century. He is believed to have created them in his home in Philadelphia, Pennsylvania, as a solution for his own vision problems. Franklin's design involved combining two different optical prescriptions into a single lens, allowing for both distance and near vision correction.
Bifocal
My gran has some bifocal glasses.
science bifocal
they were made in 1784 he didnt actuallly counstruct it a man in France or London did it for him
Benjamin Franklin
Bifocal contacts lenses are a better option..:)
Benjamin Franklin in America is usually regarded as the inventor of the Bifocal glasses .
Bifocal is a type of corrective lens. Bifocal lenses are divided into two sections, usually the top for seeing far away objects and the bottom for seeing nearby objects.
It means you are using a bifocal contact lens that has a bifocal power of about +1.25 to +1.50. A high add would have the bifocal power of about +2.50.
Bifocal
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Bifocal lenses as a concept were not patented; there are dozens of patents related to bifocals, bifocal contacts, and processes to make bifocals.