These lenses are Category 3 - High sun-glare and good UV protection (AS/NZ 1067:2003) - compatible with standards in US and Europe to suit Genuine Tiffany & Co. sunglasses model 4174BF - size 56mm
Lens information:
Lenses are made from CR-39 Resin - thin, lightweight, clear and shatter-safe.
Particulars:
A/R coating: These lenses have Anti-Reflection (multi-coating) coating on the back surface of the lens, to improve contrast and eliminate glare from your own face, or from unwanted lights behind you (only the best/top-shelf lenses have this feature).