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Salvino D'Armate invented the first eyeglasses that perched on the bridge of the nose. They were used to treat farsightedness.
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Edward Scarlett invented the back part of glasses to stay on your ears.
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Benjamin Franklin harnessed the power of concave lenses for nearsighted people.
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Sir George Airy invented lenses to help people with a defect in the eye that distorts images.
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Plastic lenses were less breakable, lighter and thinner.