June 27·Every year

National Sunglasses Day

The first sunglasses were flat pieces of smoky quartz used by Inuit people to reduce snow glare, predating lenses by centuries. Sam Foster introduced mass-produced sunglasses in Atlantic City in 1929. Overexposure to UV light is a leading cause of cataracts — 94 million Americans own at least one pair, and most wear them incorrectly.