invention of bifocal spectates
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The mounting of two half lenses into a single frame led to a number of early complications and rendered such spectacles quite fragile. In 1784, Benjamin Franklin developed bifocal glasses. ... John Isaac Hawkins, the inventor of trifocal lenses, coined the term bifocals in 1824 and credited Dr. Franklin.
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The mounting of two half lenses into a single frame led to a number of early complications and rendered such spectacles quite fragile. In 1784, Benjamin Franklin developed bifocal glasses. ... John Isaac Hawkins, the inventor of trifocal lenses, coined the term bifocals in 1824 and credited Dr. Franklin.
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