voltX 'DEFENDER ULTRA' Safety Goggles Clear & Smoke Lens, CE EN166BT UV400 lens

Independently Certified to CE EN166BT, EN170. How strong are voltX Safety glass lenses?. How are voltX Safety glasses tested, and to what standards?. Refractive Power and Astigmatism. UV400 LENS PROVIDE 100% PROTECTION AGAINST HARMFUL UV RAYS.