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A progressive lens design is like a bi- or tri-focal lens in that it corrects more than one vision problem at a time. However, these lenses have no visible lines, improving the cosmetic appearance of ...

Understanding vision requirements, selecting the right lens materials and considering protective coatings can make ...

Progressive multifocus glasses for all your need. The bottom part of the lens is full-power magnification, then used for nearly distance reading. The middle part is slightly reduced power ...