About Sunglasses

Early sunglasses served a special purpose and it wasn't to block the rays of the sun. Smoke tinting was the first means of darkening eyeglasses, and the technology was developed in China prior to 1430. These darkened lenses were not vision-corrected, nor were they initially intended to reduce solar glare. For centuries, Chinese judges had routinely worn smoke-colored quartz lenses to conceal their eye expressions in court.

A judge's evaluation of evidence as credible or mendacious was to remain secret until a trial's conclusion. Smoke-tinted lenses came to serve also as sunglasses, but that was never their primary function. And around 1430, when vision-correcting eyeglasses were introduced into China from Italy , they, too, were darkened, though mainly for judicial use.

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.

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