Uvex S3160X Ambient OTG (Over The Glasses) Safety Eyewear, Medium Blue Frame, Clear UV Extreme Anti-Fog Lens Provides over-the-glass (OTG) coverage, offering you full protection while wearing you own prescription eyewear. Available in two lens sizes (medium and large) to fit a variety of users and prescription eyewear styles. The medium version has a 13% smaller lens than the larger version. Exceptional peripheral vision with soft, flexible nasal fingers conform to a variety of facial profiles and minimize slippage. Adjustable and bendable, wire-core temples offer complete flexibility with secure, customized fit. Meets ANSI Z87.1-2003 (High Impact), Certified to CSA Z94.3 standards, 99.9% UV.