LENS -Regulations on protection levels: The European standar EN 1836:2006 provides 5 levels ranging from low to high protection, from 0 to 4 according to their transmittance (the percentage of UV rays that pass trhough the lens): 0: from 80 to 100% 1: from 44 to 80% 2: from 19 to 43% 3: from 9 [...]
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