The best digital lens on the market today, the Physio W3 lens is digitally carved on both sides to provide the most comfortable, and widest viewing area possible. The name has been change to W3 from “Enhanced”, which means that the lens is digitally carved on both the front and back side of the lens. This results in less distortion and a wider “corridor” or viewing area in the middle of the lens. As a result, you get the most comfortable and easy to wear progressive lens that is available on the market today. The recommended prescription range for this lens is -6.00 to +6.00 sphere, and -3.00 to +3.00 cylinder (slab off and prism excluded).