Polycarbonate lenses are superior to glass and plastics in strength and impact resistance. Lenses come in different colors. Clear lenses are for most general applications. Amber or orange lenses increase vision and clarity in low light conditions. Gray and green tints, and mirrored lenses provide protection in bright light or flash environments.
Polycarbonate lenses provide protection from standard UV radiation.
This standard lists strict requirements for impact and penetration resistance. Requirements include high mass impact and high velocity impact tests for spectacles, goggles, faceshields, and welding helmets. ANSI Z87.1-1989 specifies that eye protective devices do not provide unlimited protection and should not be used as substitutes for machine hoods, protective shields, and other equipment protective devices.