Optical devices worn on the face to correct vision problems or protect the eyes, consisting of lenses mounted in frames.
From Old English 'glæs,' related to 'gleam.' The plural form developed because early spectacles were two separate lenses. First eyeglasses appeared in 13th-century Italy among monks and scholars.
The first sunglasses were created by Inuit peoples using walrus ivory with narrow slits to reduce glare from snow. Modern prescription glasses can now be made so thin they're nearly invisible thanks to high-index lens materials.
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