Posts Tagged ‘lens casting’

Digital Progressive Lenses.

Monday, March 7th, 2011

Project 365 "Tired of Waiting"

Advanced technology  is finally available to create free form digital progressive eyeglass lenses. This post will discuss a few reasons why custom lenses may be worth waiting for.  There are two basic ways of producing progressive lenses in about an hour:

1. Casting technology is where liquid lens material is added to a mold and then exposed to UV light to form the finished lens.

Disadvantage:  At this time anti-scratch and anti-reflective coatings that can be applied in office on lenses made in this fashion are inferior in quality and they are not available in the newer free form digital style lenses.

2. Semi-finished lenses is where the progressive bifocal has already been ground on the front surface of the lens and then the back surface is ground to meet your distance prescription.

Disadvantage: The anti-reflective and anti-scratch coatings are removed from the back surface in the process leaving only the front surface coatings in tact.  Also, these lenses are not available in the newer free form digital style lenses.

Custom free form digital style progressive lenses are made possible by advances in technology that can combine information from your individual refraction (the one or two portion of the exam),selected frame , and frame fitting geometry to deliver superior vision compared to conventional progressive lenses.

Learn more about free form digital lenses and schedule an appointment today. Gray Family Vision has two greater Portland Maine locationsto serve you in Gray and Windham.