A member asked:

What are multifocal glasses lenses?

A doctor has provided 1 answer

Bifocal substitute: These are eyeglass lenses with a continuous grind so no line is visible. They offer a large distance and near area for correction and a narrower central band of intermediate clarity. They cost a little more but offer a cosmetic and sometimes optical advantage for those in the presbyopic age.

Answered 4/10/2014

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Is it normal for glasses lenses to turn yellowish with time?

A doctor has provided 1 answer