Titanium Oval eyewear features ultra lightweight composition and adjustable non-slip silicone nose pads for maximum long wearing comfort. Included fitted side shields increase scatter radiation protection. Available with Rx* lenses. Model 55 - Front Lenses: 0.75mm Pb Equivalency Optical Lead Glass - Includes Side Shields: 0.50mm Pb Equivalency Lead Foil - Optional Rx*: Single Vision (SV), Bifocal (BI) and Trifocal (TRI)