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Sunglasses: Difference between revisions
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Flat panes of [[Smoky quartz]] which offered no corrective powers but did protect the eyes from glare were used in China in the [[12th century]] or possibly earlier. Contemporary documents describe the use of such crystals by judges in Chinese [[court]]s to conceal their facial expressions while questioning witnesses.{{Fact|date=March 2007}} | Flat panes of [[Smoky quartz]] which offered no corrective powers but did protect the eyes from glare were used in China in the [[12th century]] or possibly earlier. Contemporary documents describe the use of such crystals by judges in Chinese [[court]]s to conceal their facial expressions while questioning witnesses.{{Fact|date=March 2007}} | ||
[[James Ayscough]] began experimenting with tinted lenses in spectacles in the mid- | [[James Ayscough]] began experimenting with tinted lenses in spectacles in the mid-18th century. These were not "sunglasses" as such; Ayscough believed blue- or green-tinted glass could correct for specific vision impairments. Protection from the sun's rays was not a concern of his. | ||
=== Modern developments === | === Modern developments === | ||
