As pointed out by the specialist in optics at the Universidad Complutense de Madrid, Ricardo Bernárdez Vilaboa “the level of protection depends on the category of the filter that appears with a number on the rod of the glasses inside a circle. The numbering is from 1 to 5 and accompanies as an information note to any sunglasses. The number indicates the recommended use from light attenuation (1) to exceptional luminosity (5) “.
This post was last modified on July 7, 2017 10:25 am
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