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1286
Eyeglasses are invented in Italy
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1286
Eyeglasses invented
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1440
Rate of literacy goes up, due to printing press- glasses become widely used
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1440
Printing press invented- glasses used more
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Benjamin F. creates bifocals
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Glasses more accepted- Everyday wear (Simplified)
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Sunglasses begin to be manufactured- WW2 pilots, then for people
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Lenses & Frames changed to plastic- safer