measuring prism in progressive lenses

**Daniel Cunningham** · 08-23-2007, 11:49 AM

Hi:

One of my students asked me this. Why do we measure the prism in a progressive lens at the prism point and not the point on the lens through which the patient is looking?

Daniel

**MikesOptical** · 08-23-2007, 12:24 PM

sounds like a student trying to pass a test.

**Fezz** · 08-23-2007, 01:10 PM

This link was written by our very own Darryl Meister. It has just about everything you ever wanted to know about progressives.

http://www.opticampus.com/cecourse.p...essive_lenses/