[Answer] Which medical invention is credited to Ben Franklin?

Step 1 : Introduction to the question "Which medical invention is credited to Ben Franklin?"

...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.

Step 2 : Answer to the question "Which medical invention is credited to Ben Franklin?"

Bifocals:

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