Ordinary sunglasses block UVA and UVB light from the front, but these ultraviolet rays can still reach your eyes from the unprotected sides. That's why Gargoyles developed their patented wrapback design. It provides distortion-free comfort and clarity with a 210º curved line of defense against light, dust and debris. Their Dual Lens Toric Curve™ with its patented zero-prism design, corrects for refraction so your eyes don't have to. The image your eyes receive is always accurate so they don't have to work overtime. The result is you're free to see without distortion, headaches or dizziness.