Bifocal Reading Glasses presents you the History of Bifocals:
The origin of reading bifocals begins with the origin of magnification, which dates all the way back to Egyptian hieroglyphs around 700 BC.
The earliest written record of such magnification appears to be the first century AD when Seneca the Younger, a tutor of Emperor Nero, wrote how small letters could be made more large and clear using a “globe or glass filled with water.” Appropriately, there is written evidence that Emperor Nero’s enjoyment of gladiator games was improved by the use of a vision-correcting lens in the form of an emerald.
Later, many believe corrective lenses of some form were utilized by Abbas Ibn Firnas in the 9th century AD. Abbas Ibn Firnas developed a method to create clear glass. He shaped and polished the glass into rocks of round he called reading stones. The earliest concrete evidence of these sorts of magnifying devices (utilizing a convex lens to magnify an image) seems to be the Book of Optics, published by Alhazen in about 1021.
Translating this vital source of knowledge into Latin during the 12th century led to the earliest eyeglasses Continue reading