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The first vision aid, usually made out of quartz or glass. -
The 1st glasses. Had no sides; the wearer would often have to hold them to their face. -
Nicholas of Cusa used concave lenses to correct nearsightedness
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Long side pieces to go over the ears. Had loops at the end to be inserted into a wig. -
Benjamin Franklin invented bifocals to correct nearsightedness and farsightedness -
During the 1800s glasses began being sold for a reasonable price.
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Sir George Biddle Airy invented glasses to correct astigmatism
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small frame that fits snugly over the face and pinched the nose. -
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Lighter and cheaper -
Thin and distortion free.