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EN166 F is the highest standard available in safety spectacles. At safetyspecs.co.uk ALL of our prescription safety glasses conform to EN166 F (as long as specified with polycarbonate or Trivex lens material) Click here to review our range of over 60 styles from different manufacturers. Eye Injuries.
The protective shade numbers refer to the darkness shade of safety glasses or welding shields, the higher the number the darker the glass. ANSI and the American Welding Society (AWS) publish a slightly more detailed chart, in ANSI Z49.1:2005 Safety in Welding, Cutting, and Allied Processes. In both cases, the recommendations offer the rule of thumb to âstart with a shade that is too dark to see the weld zone.