Breakthrough Science Improves Free-form Progressive Lens Design and Optimization

By Deborah Kotob, ABOM

Release Date: February 15, 2022

Expiration Date: December 7, 2024

Learning Objectives

Upon completion of this course you should understand:

  1. To learn the importance of matching Rx power with a compatible, optically correct base curve.
  2. To learn how a progressive lens blank with a variable base curve front surface improves upon the single vision blanks typically used in freeform lens surfacing.
  3. To learn why variable base curves can improve progressive digital lenses' optical characteristics, range, and cosmetics.
  4. Learn about the contribution of mean sphere power error to produce lateral defocus in a progressive lens and a breakthrough patented PAL design methodology and technology that minimizes its effect for greater image stability (less swim).

Course Description

In this course, you will learn that the single vision blanks are not the ideal lens form foundation upon which to build a digital freeform progressive lens design and why. You will learn how the Camber™ variable curve blank, an innovative front surface technology, improves freeform progressive lens optimization over a single vision blank. Ultimately, optimal curves on a progressive lens's front and back surfaces produce the best lens form and optical performance. Lens designers/engineers prefer to work with two surfaces for a reason. A sophisticated variable base curve blank is the correct foundation for building the back surface design but merging complex curves from both surfaces also requires advanced design technology. In this course, you will also learn about the optical fundamentals behind the unique Camber™ progressive lens blank. You will learn about the new unique patented Steady Plus Methodology (only available on Camber PAL lenses) and Digital Ray-Path 2 technology. All Camber™ PAL lenses feature the Steady Plus Methodology, the most advanced backside freeform lens surface calculation technology, applied to the only variable base curve Camber™ blank. For the first time, IOT Digital Ray-Path 2 technology reduces mean sphere power error. Why is this important? Reducing mean power error lateral to the progressive corridor minimizes lateral defocus and the 'Swim' sensation. So, freeform technology is great! But does Camber™ with Steady Plus Methodology and IOT Digital Ray-Path 2 Technology make it better? The answer is yes.

Faculty/Editorial Board

Deborah Kotob, ABOM, is currently director of education for Jobson Medical Information LLC, has more than 20 years of experience as an optician. With over 10 years in lens manufacturing as a Sales Consultant, Trainer and LMS content developer. She lectures, trains, and conducts webinars on a variety of optical and practice development topics.

Credit Statement

This course is approved for one (1) hour of CE credit the American Board of Opticianry (ABO). 1 hour, Ophthalmic Technical level 2 Course STWJHI054-2.



This course has multiple parts.

To complete the course watch the video presentation and complete the activities, download and review the resources. To earn credit for this course review the test questions and take the test. Passing scores are reported to the ABO and your ABO account will be electronically updated.

Click here for Video.