Uvex S3773 Genesis Reading Magnifiers Safety Eyewear +2-1/2, Black Frame, Standard Gray Ultra-Dura Hardcoat Lens Three position rachet lens inclination adjusts to complete the fitting system and provides unsurpassed extended wear comfort A unique ventilation channel between the frame and lens vents the eye socket area to deliver an outstanding level of moisture and fog control Soft flexible fingers on the nose piece adjust and conform to almost any nasal profile to reduce slippage Economical and easy lens replacement system allows for multiple lens tints and extends the life of the eyewear Meets ANSI Z87+ and CSA Z94.3 standards and military Vo ballistic impact test (7 times higher than ANSI requirements)