Bifocals, eyeglasses with two distinct optical powers, are most commonly prescribed to people with presbyopia (a progressively diminished ability to focus on near objects) who also require a correction for myopia (nearsighted or shortsighted), hyperopia (farsighted or longsighted), and/or astigmatism.
Benjamin Franklin is generally credited with the invention of bifocals.
Bifocals in Atlantis[]
Bifocals were eyeglasses whose corrective lenses each contain regions with two distinct optical powers. They were invented in the 18th century by Custis Cawthorne, who later became a founding father of the United States of Atlantis.
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