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A glass sphere was laid on top of the text to magnify the letters
(teagleoptometry.com) -
Between 1285-1289
Made of convex shaped glass / crystal stone, they were set in bone, metal or leather mountings and balanced on the bridge of one's nose
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Tommaso de Modena’s painting depicts monks reading and writing manuscripts with one monk using a magnifying glass and another with a pair of glasses perched on the nose (glasseshistory.com)
Image - io9.com/strange-and-wonderful-moments-in-the-history-of-eyeglas-507302709 -
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Edward Scarlett, a London optician, developed rigid side pieces to place over the ears to keep them from falling of the face (ehow.com)
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teagleoptometry.com
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Benjamin Martin, a London optician created “Martin’s Margins” as a way to reduce the damage to eyes from excessive light. (antiquespectacles.com)
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(i90.com)
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glasseshistory.com