First Spectacles 'Upanetra' by Adi Sankaracharya in 5th century BCE - Ancient Technology
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Glasses - Wikipedia
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When were eyeglasses invented?
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Glasses - Wikipedia
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Top ten innovations in eyewear (a brief history). | by Wires Glasses | Medium
When did people start using spectacles for weak eyesight? Who was the first recorded celebrity in India to wear spectacles ? - Quora
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Glasses - Wikipedia
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The Fascinating History of Eyeglasses | All About Eyes
