Benjamin Franklin had an impressive CV that included titles like postmaster, politician, freemason, inventor, and diplomat. Which vision-improvement aid is he credited with inventing?
Answer Bifocal lenses
Benjamin Franklin wrote in 1784 that he was "happy in the invention of double spectacles, which serving for distant objects as well as near ones, make my eyes as useful to me as ever they were".
Asked by Kiera Hart · Last updated 5 years ago · 12.3M views
