OX™ over-the-glass eyewear extends the view, increases the comfort and provides custom fit and adjustability for prescription eyeglass wearers. It's the best of both worlds. Prescription eyeglass wearers get the added safety of the all-around polycarbonate lens without sacrificing the vision, comfort and familiarity of their own personal glasses. Tough, high-impact polycarbonate lens provides 99.% UV protection.