.The first sunglasses were invented sometime in 12th century China.
.Around 1430 vision-correcting eyeglasses were darkened and they were introduced into Italy via the Chinese.
.In 1929, Sam Foster, founder of the Foster Grant of Atlantic City , had put sunglasses into mass production in America and was doing a roaring trade through his company.
--1300c Chinese judges wore smoke-colored quartz lenses to conceal their eye expressions in court.
--1430c Vision-correcting darkened eyeglasses were introduced into China from Italy
--1700c James Ayscough believed blue-green-tinted glass could correct specific vision impairments.
--1929 Sam Foster found a ready market for sunglasses on the beaches of Atlantic City, New Jersey
--1936 Sunglasses become polarized, Ray Ban began using Edwin H. Land Polaroid filter.
--1960 A clever advertising campaign by Foster Grant makes sunglasses chic and popular.
--2004 Oakley, eyeware company, developed Thump, sunglasses with built-in digital audio player.