Lightweight Spectacles For Over-the-Prescription Spectacles Users Single Piece Polycarbonate Lens With Wide Temples With Vents For More Protection & Comfort, Wrap-Around Frameless Style For Exceptional Comfort, Protection & Fit. Distortion-Free & Impact-Resistant Lens. OPTICAL CLASS 1Conforming to EN 166: 2001/ANSI Z87.1 Standards.