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Bifocals. A bifocal lens with areas of differing magnification. Bifocals with separate lenses. In this case, the Swedish ethnologist Jan-Öjvind Swahn [ sv]. Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism .
Benjamin Franklin FRS FRSA FRSE (January 17, 1706 [ O.S. January 6, 1705] [ Note 1] – April 17, 1790) was an American polymath: a leading writer, scientist, inventor, statesman, diplomat, printer, publisher and political philosopher. [ 1] Among the most influential intellectuals of his time, Franklin was one of the Founding Fathers of the ...
Benjamin Franklin in the 1780s developed the bifocals. Bifocal lenses advanced little in the first half of the 19th century. The terms bifocal and trifocal were introduced in London by John Isaac Hawkins, whose trifocals were patented in 1827. In 1884 B. M. Hanna was granted patents on two forms of bifocals which become commercially ...
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 ...
Michael Douglas says he had his work cut out for him turning into Benjamin Franklin for his new Apple TV+ series.. Talking with ET's Cassie DiLaura ahead of the release of his show, Franklin, the ...
Ben and Me. Ben and Me is an American animated two-reel short subject produced by Walt Disney Productions and released theatrically on November 10, 1953. [ 1] It was adapted from the book of the same name written by author/illustrator Robert Lawson and first published in 1939. Though both book and film deal with the relationship between a mouse ...