Sunglasses facts for kids
Sunglasses or sun glasses (informally called shades) are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist, featuring lenses that are colored, polarized or darkened. In the early 20th century, they were also known as sun cheaters (cheaters then being an American slang term for glasses).
The American Optometric Association recommends wearing sunglasses that block ultraviolet radiation (UV) whenever a person is in the sunlight to protect the eyes from UV and blue light, which can cause several serious eye problems. Its usage is mandatory immediately after some surgical procedures, such as LASIK, and recommended for a certain time period in dusty areas, when leaving the house and in front of a TV screen or computer monitor after LASEK. It is important to note that dark glasses that do not block UV radiation can be more damaging to the eyes than not wearing eye protection at all, since they tend to open the pupil and allow more UV rays into the eye. Since the 1940s, sunglasses have been a popular fashion accessory, especially on the beach.
Images for kids
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Inuit snow goggles function by reducing exposure to sunlight, not by reducing its intensity
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Effect of pair of polarized filters
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Broad temple arms protect against "stray light" entering from the sides
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Sunglasses with slim temple arms
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Protecting his eyes from exposure due to exophthalmos, sunglasses have become the trademark of German singer Heino
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Sunglasses worn by an ocean kayaker
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Athlete Mo Farah wearing iridescent lenses in Doha Qatar.
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1969 on board the Eagle: Buzz Aldrin stows his sunglasses before the Moon landing
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1969: Helmet visor protecting Aldrin's eyes on the Moon
See also
In Spanish: Gafas de sol para niños
