GENERAL KNOWLEDGE

Detailed explanation-1: -Bifocals are commonly prescribed to people with presbyopia, a condition that Franklin suffered. Franklin wrote, in August 1784 to his friend George Whatley, 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."

Detailed explanation-2: -Bifocal lenses are eyeglasses that provide two different lens powers, correcting vision at both long and short distances. Bifocals are commonly used to help the eye adjust vision to focus on objects that are close once it begins to lose the ability to transition focus due to age-related conditions like presbyopia.

Detailed explanation-3: -History of Bifocal Lenses Benjamin Franklin is credited for inventing bifocals in 1784. He created them because he was tired of switching eyeglasses for far and near.

Detailed explanation-4: -Bifocal eyeglass lenses contain two lens powers to help you see objects at all distances after you lose the ability to naturally change the focus of your eyes due to age, also known as presbyopia.