What date did Benjamin Franklin invent the bifocals?

Answer 1

Glass lenses, for use as magnifiers or for starting fires, date to about 300 BC, but the first eyeglasses to aid or correct vision were almost certainly invented in 1280 in Florence, Italy by the Dominican friar Alessandro della Spina and / or his friend, the physicist Salvino degli Armati. Prescribed for far-sightedness, the glasses had convex lenses and were worn by Armati, who had injured his eyes while performing light refraction experiments and discovered that it was possible to enlarge the appearance of objects by looking through two pieces of convex glass.It was in the early fourteenth century that concave lenses were used to correct near-sightedness. In fact, Pope Leo X was depicted wearing glasses, with concave lenses, in a 1517 painting by Raphael. Whereas early eyeglasses were made of polished quartz, by the sixteenth century developments in glassmaking made it possible to mass produce them from glass. Bifocals, the combination of both concave and convex lenses for both types of vision correction, a top lens for distant viewing and a lower lens for reading, were developed around 1760 by the American statesman and inventor Benjamin Franklin.

Answer 2

In no year.

Benjamin Franklin did not invent bifocals; they had been invented by two other people, independently of each other, many years before.

Answer 3

Benjamin Franklin invented bifocals in 1784!!

Answer 4

Ben Franklin invented bifocals in August of 1784. He was quite pleased to finally have spectacles that allowed him to see things close up as well as at a distance.

Answer 5

1258 with help from Salvino D Armate ,they did this in Italy.

Answer 6

He made them in 1784 and I think he was visting France?

Answer 7

1784.