With summer approaching, the National Eye Institute has reminded people to protect their eyesight by wearing sunglasses that block ultraviolet radiation whenever they go outside during daylight hours.
Ultraviolet radiation is energy radiated out from the sun that arrives on Earth in wavelengths too short for the human eye to see. Dr. Andrea Thau, president of the American Optometric Association, says, “The recommendations are that eyeglasses should block UVA and UVB radiation.”
When buying sunglasses, look for a tag or label that says 100% protection against both UVA and UVB or 100% protection against UV 400.
The UV 400 designation indicates that the lenses are able to block radiation equal to or shorter than 400 nanometers, which covers both UVA and UVB rays.