Crews BearKat Polycarbonate Bifocal Safety Glasses BKH15 available at Discount Safety Gear filter out 99% of UV radiation and they meet or exceed ANSI Z87.1 safety standards. Available in four strengths ranging from 1.0 Diopter to 2.5 Diopter, the glasses are made to prevent obstructions to vision because of the design of the one-piece wraparound lens. The fit is tight enough to provide total safety and virtually all of your vision is inside the lens view. Non-slip rubber head grips are included. They are comfortable and durable, and also serve as an inexpensive alternative to pricey designer sunglasses. They even have built-in readers.