The Varilux Physio Enhanced 1.67 Index lens is the best lens in this category. "Enhanced" 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 -9.75 to +6.00 sphere, and -4.00 to +3.00 cylinder (slab off and prism excluded).
The Varilux Physio Enhanced 1.67 Index lens is even more comfortable to wear than the Physio or the Comfort Lens. It is comparable to the Definity Digital Lens.
In addition, the Physio lens improves contrast sensitivity by helping people in day to day situations as, driving at night, reading the newspaper and experiencing the vivid colors in a bouquet of flowers. Varilux has developed an innovative design and manufacturing process—W.A.V.E. Technology—which literally corrects progressive vision to deliver the sharpest progressive vision.
Sharp vision has two key components: Visual acuity and contrast sensitivity. By dramatically reducing or eliminating higher order aberrations, Varilux Physio delivers an improvement in contrast sensitivity—the ability to see visual details and colors--by up to 30%. Varilux Physio is the only lens proven to increase contrast sensitivity in all fields of vision.
The Varilux Physio is made by Essilor, the world's largest maker of high quality eyeglass lenses