DeWalt Reinforcer Rx Bifocal Safety Glasses-Smoke The DEWALT Reinforcer Rx combines a safety glass with a reading glass Magnification diopter is molded into the polycarbonate lens creating a safety glass and Reading glass all-in-one Soft, rubber non-slip nosepiece provides maximum all day comfort Tough, polycarbonate lens is impact resistant and provides 99.9% UV protection Distortion free lens provides fatigue free use