The Rugged Blue Reader Safety Glasses feature reading lenses that are built right in with four different diopter strengths including 1.0, 1.5, 2.0, and 2.5. These sturdy readers feature a wraparound lens for better vision along with a polycarbonate frame/lens. The polycarbonate design resists breakage and makes cleaning extremely easy. ANSI Z89.1 & CE EN116 rated.