European Eyewear Safety norms

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Lens Marking

K Anti Scratch: resistance to surface deterioration by fine particles.
N Anti Fog: fog resistance. For the eyepieces to comply, they must remain free of fog for a minimum of 8 seconds at 100°C.
1 Continuous work - Permanent wearing
F Low energy impact, resists a 6 mm ball and 0.86 g at 45 m/s.
B Medium energy impact, resists a 6 mm ball and 0.86 g at 120 m/s.
T Impact resistance at extreme temperature, -5° (± 2°) & 55° (±2°)
9 Molten metal and hot solids
C unaltered colour perception
2-1.2 / EN 170 Clear eyepiece filter filtering 99% of UV rays, for indoor work / in accordance with EN 170 (Ultraviolet filters)
5-3.1/ EN 172 Tinted eyepiece filter filtering 99% of UV rays, for outdoor work / in accordance with EN 172 (Sun protection filters for industrial use)

Frame marking

EN 166:2001 Guarantee of minimum resistance of the protection to common risks related to personal protective equipment regarding safety, comfort and strength. 
3 Protection against droplets or splashing liquids.
4 protection against large spray particles > 5 microns.
F Low energy impact, resists a 6 mm ball and 0.86 g at 45 m/s.
B Medium energy impact, resists a 6 mm ball and 0.86 g at 120 m/s.
T Impact resistance at extreme temperature, -5° (± 2°) & 55° (±2°)
9 Molten metal and hot solids.