Patents have been taken out in recent years by several major lens manufacturers disclosing progressive designs of unusual configuration. Some simply embody improvements in the design and manufacture ...

Since the introduction of the very first progressive lenses, the inevitable non-adaptation has followed. Why? Because we are asking our patients to cope with ‘bendy blended lenses’ that give different ...

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 ...