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 ...

Whether you prefer dailies or monthlies, have astigmatism, or tend to get dry eyes, here are the best contact lenses ...

Though still only in the prototype stage, this flat lens could one day be used on space telescopes, and perhaps even on ...

they weren’t using the special Fresnel-style lenses. There had been speculation about building this type of lens, but Fresnel was apparently unaware of them when he proposed his lens for ...