Trivia: Which medical invention is credited to Ben Franklin?
Bifocals
Hearing aids
X-rays
Stethoscope
Correct Answer: Bifocals
So why is this answer correct? : Bifocals are one of Ben Franklin’s most famous inventions, allowing wearers to see both close-up and at a distance using the same lens. Franklin himself suffered from presbyopia, or far-sightedness that develops later in life. In August of 1784, Franklin described his excitement for his invention of “double spectacles” to his friend George Whatley in a letter. He happily proclaimed that his eyes were useful once again.