The XM340RX offers all the same features as our popular XM340 but with Bifocal magnification technology; 1.5 magnification; Featuring anti-scratch hard coating to help improve durability from application scratches. The soft rubberized temple tips and soft nose piece offers all day comfort; Along with the anti-fog coating, these lenses are also mounted to the frame with a ventilation space which helps minimize fogging. The XM340RX safety glasses meet ANSI Z87.1+ standards and provide increased impact protection as well as protecting the user from UV rays with a 99% UV Protection Rating.