Eyeglasses come in a variety of types. This includes a single-vision lens with one power or strength over the entire lens, or a bifocal or trifocal lens with multiple strengths over the entire lens.

Please provide your email address to receive an email when new articles are posted on . NEW YORK – Shamir announced the launch of Glacier Expression, a premium antireflective coating, and an update to ...

Many people face the challenges of nearsightedness (presbyopia), farsightedness (hyperopia) and perhaps worse, both conditions at once. While bifocal and trifocal lenses are typically prescribed for ...