Lens Type: Photochromic. Polycarbonate: Polycarbonate is lightweight, comfortable, impact resistant, and provides UV protection. Revo Serilium™ lenses use the finest optical-quality lens material and have strict manufacturing processes to avoid stress and limit birefringence. Revo sunglasses with LMS™ technology selectively manage blue light to provide clear sharp vision in all conditions and maximum protection for your eyes and against potentially harmful UV and HEV rays..