100% UV protection sunglasses - All Questions Answered
2020-4-21u2002·u2002The best then are 100% UV protection sunglasses. 'UV400' is the label given to these sunglasses. 400 here represents the wavelength in nanometers that these lenses protect up to. With UV400 lenses, UV-A and UV-B rays are easily blocked as UV-A has a wavelength range of 315 to 400 nanometers and UV …
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