Wrap Around eyewear features comfortable molded wrap styling in durable tortoise nylon frame with uni-fit bridge and leaded side shields for added protection. Provides excellent peripheral visibility. Model 53 available with Rx* lenses. - Front & Side Lenses: 0.75mm Pb Equivalency Optical Lead Glass - Optional Rx* (Model 53 only): Single Vision (SV), Bifocal (BI) and Trifocal (TRI) - Model 53E: Front & Side Lenses 0.50mm Pb Equivalency Optical Leaded Glass - Non Rx