Plastic Frame Stylish Mountain Bike Glasses , Mountain Climbing Sunglasses Colorful

Authentic prescription lenses available. B-Thin utilizes software that can make the most advanced calculations to create a more customized lens and the ultimate in lightweight optics (Freeform Digital technology is part of this lens). An axial compensation of the prescription takes into account the size of the frame and the wearer's facial anatomy if necessary. This ensures optimum precision, comfort and frame balance for sports glasses. Available in 99% of prescriptions. B-Thin lenses are up to 72% thinner and 45% lighter than other lens technology. Available in polycarbonate and Trivex lens materials. Both are impact resistant but Trivex has slightly better optical clarity. Photochromic (light changing) lenses are only available in Trivex material. Trivex lenses also include backside AR for free. It can be added on to Polycarbonate lens material lenses. Available prescriptions +6.00 to -6.00 total power (sphere plus cylinder) with maximum of 4.00 cylinder power.