Eye protectors with shade markings beginning 2-, 2C-, 3-, or 5- provide certified protection against UV radiation.
Lenses beginning 5-, referred to as smoke lenses, provide higher levels of UV protection because they are a darker shade allowing less light to pass through. Lenses providing UV protection are available on spectacles, goggles, and face shields.
To get the best levels of protection, lenses that have been manufactured using a special additive that filters UV light in the 400nm range should be used. These are commonly referred to as UV400 lenses.