20/20

May 2014 Lenses

Lens Materials Are Changing: Are You Ahead of the Curve?

Glass, Polycarbonate, CR-39, Trivex, 1.60... So many lenses, so little time! Do you ever find yourself overwhelmed by the amount of lens material options available on today's market?
November 2011 Lenses

Cylinder Rx's and Practice Opportunies

In an analysis of prescriptions received by the laboratory, as many as 46 percent of the cylinder prescription distribution is equal to or more than 0.75 diopters (Fig. 4).
November 2011 Lenses

Aspheric and Double Aspheric Lenses

The opportunities for single-vision aspheric lenses are relatively well known. Aspheric lenses improve the cosmetics of a pair of glasses by using surface curves that are flatter centrally and progressively flattened (in plus prescriptions) as one moves from lens center to edge.
November 2011 Lenses

Aspheric Lenses

In contemporary frames, we have new challenges. First, smaller frames tend to be “flatter”. in larger frames, lenses often bulge out the front especially in plus powers.

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September 2021

September 2021

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