ANSI (American National Standards Institure) is the recognized entity that sets forth manufacturing standards in the U.S.  The current ANSI Z87.1-2003 Standard requires that sefety glasses and goggles provide:  adequate protection from the hazardsfor whcih they were designed, reasonable comfort, a secure fitwithout interferingwith movement or vision, the ability to easily be cleaned and disinfected, durability and the ability to over or incorporate prescription eyewear.