Conventional stock lenses provide sharp view at the center of the lens, with some distortion in the peripheral areas. Grind lenses are made with advanced optical design technology and are specially surfaced to the correct thickness for the dimensions of the frame. These lenses provide sharp view and minimal distortion in the peripheral areas
Single vision lenses are those that have the same focal power throughout the lens. They can be used to treat short-sightedness, far-sightedness or astigmatism.