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Bifocals are eyeglasses with two distinct optical powers correcting vision at both long and short distances. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia , hyperopia , and/or astigmatism .
The first half of the 18th century saw British optician Edward Scarlett perfect temple eyeglasses which would rest on the nose and the ears. The innovations presented by Scarlett would not only spark some to look at aesthetic customization of eyewear for fashion within Europe but also lead Benjamin Franklin to invent bifocals in colonial America. [12]
Bifocals are eyeglasses whose corrective lenses contain regions with two distinct optical powers. Benjamin Franklin is credited with the invention of the first pair of bifocals in the early 1760s, though according to the Library Company of Philadelphia , the first indication of Dr. Franklin wearing his double spectacles comes from a political ...
Man with glasses. A woman with glasses. Glasses, also known as eyeglasses or spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.
His numerous important inventions include the lightning rod, bifocals, glass harmonica and the Franklin stove. [8] He founded many civic organizations , including the Library Company , Philadelphia 's first fire department , [ 9 ] and the University of Pennsylvania . [ 10 ]
Around 1286, possibly in Pisa, Italy, the first pair of eyeglasses was made, although it is unclear who the inventor was. [51] The earliest known working telescopes were the refracting telescopes that appeared in the Netherlands in 1608.