June 27 of each year celebrates National Sunglasses Day.
Show us how "cool" you look in summer's most popular fashion accessory, and we will add your photo to our NBC 10 sunglasses slideshow.
According to the National Day Calendar website, here are facts you might not know about sunglasses:
The word "cheaters" is an American slang word for glasses. In the early 20th century, sunglasses were sometimes known as sun cheaters.
As a way to protect yourself from several serious eye problems that can be caused by ultraviolet radiation and blue light, healthcare professionals recommend eye protection whenever the sun comes out.
Stemming from a desire to mask their identities, sunglasses have long been associated with celebrities. It was in the 1940s that sunglasses, especially on the beach, really became a fashion accessory.
In 12th century China, sunglasses were made with flat panes of smoky quartz.
Sam Foster introduced inexpensive mass-produced sunglasses to America in 1929, selling them under the name Foster Grant.
An article in a 1938 Life magazine reports that sunglasses were a "new fad for wear on city streets…," stating that "20 million sunglasses were sold in the United States in 1937, of which only about 25 percent Americans needed them to protect their eyes."
Polarized sunglasses became available in 1936.
Dark lenses do not automatically filter out more harmful UV radiation and blue light than light lenses.
Inadequate dark lenses can be harmful as they provoke the pupil to open wider resulting in more unfiltered radiation entering the eye.
A 1995 study reported that "Expensive brands and polarizing sunglasses do not guarantee optimal UVA protection."
Sunglasses that are sold in the United States are regulated by the Food and Drug Administration and are required to conform to safety standards.
Shades is another term for sunglasses.
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