Sunglasses lenses are categorized from 0 to 4. Knockaround sunglasses fall under category 3 which work best in above average light conditions and offer high sun glare reduction. Our Blue Light Blocker lenses fall under category 1, while our Clear lenses fall under category 0. Both Clear and Blue Light Blocker lenses are not sunglasses and offer very low sun glare reduction.
If you have additional questions regarding our sunglasses, please contact our Customer Support Team here.