What is UV 400 protection on sunglasses? - All About Vision
2021-9-27u2002·u2002A pair of sunglasses may have dark lenses, which could be presumed to block rays, but that doesn't mean the shades provide adequate UV protection. If those sunglasses with dark lenses don't include UV protection, those darker shades are actually worse for your eyes than not wearing any protective eyewear at all.
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