BIFOCALS, 1760s. Benjamin Franklins sketch for bifocal
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Benjamin Franklin - Independence National Historical Park (U.S. National Park Service)
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SVS Vision - Do you wear Bifocal lenses? Did you know that Benjamin Franklin created the Bifocal lens by piecing together two lenses into one frame? He announced his creation on this
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Image of BIFOCALS, 1760s. - Benjamin Franklin's Sketch For Bifocal Eyeglasses, Which He Is Credited With Inventing. From Granger - Historical Picture Archive
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Bifocal Glasses Poster, Scientific Illustration, School
