Slab-off, Reverse Slab-off and Bi-centric Grinding

By Andrew S. Bruce, ABOM
Tuesday, February 18, 2014 1:00 PM The most common way of correcting vertical imbalance is to induce a vertical prismatic effect in the lower half of one lens. This type of correction is referred to as bi-centric grinding, or slab-off.

The Evolution of ANSI Z80.1 Spectacle Lens Standards

By Dick Whitney (ANSI Z80.1 Chairman)
Tuesday, February 11, 2014 3:10 PM "I follow ANSI Standards when inspecting mounted lenses prior to dispensing."

Verification of Slab-off

By Andrew S. Bruce, ABOM
Monday, February 03, 2014 10:30 AM There are two ways basic ways to verify slab-off: Comparing the vertical prismatic effects of the two lenses through a lensometer and checking for actual image displacement at the reading level.

A Prism Tutorial, Part 3

By Andrew S. Bruce, ABOM
Tuesday, December 03, 2013 3:51 PM First, it is an effect of the prescription as determined by the doctor, so we cannot fix it, but we can correct for it. Some methods are capable of correcting for more imbalance than others.

Anisometropia and Antimetropia

By Andrew S. Bruce, ABOM
Sunday, November 24, 2013 10:00 AM According to “The Dictionary of Ophthalmic Optics” (Keeney, Hagman, & Fratello), Anisometropia is defined as, “Unequal refractive errors in the two eyes.” 

A Prism Tutorial, Part 1

By Andrew S. Bruce, ABOM
Tuesday, November 19, 2013 1:00 PM Powered lenses are, in effect, prisms either mounted base to base (plus lenses), or apex to apex (minus lenses).

Two Short Kids and Two Photons

By Ari Siletz
Wednesday, October 16, 2013 11:00 AM Children waiting in line get on an amusement park ride dread the sign that says "You Must Be This Tall to Ride." Particles of light (photons) on their way to break a molecular bond run into a similar problem.

New Lensometry iPad App

By Staff
Wednesday, September 18, 2013 6:29 PM

Digital can be a wonderful tool and in his interactive book on Lensometry, Mark Bullimore, MCOptom, PhD, FAAO brings learning the Lensometer to life through interactive video and an embedded glossary.

Index of Refraction Explained By A Race?

By Ari Siletz
Wednesday, August 14, 2013 5:26 PM An optician, a nurse, and a pharmacist are competing in a reality show. A coffee thermos is left floating just offshore from the beach and the first one to reach it gets a hot cup of coffee.

Anti-Reflective Coating...Are We Looking at This Wrong?

By Norm Kester, Quantum Innovations
Tuesday, July 23, 2013 2:00 PM When I am on a plane, in an airport or at a dinner and people ask me what I do, I respond by saying, "I bend light and count molecules for a living." This is a pretty grand statement and most times I am proud of the complex, medically beneficial science that I am in.

Your Vision Is Fluid - Shouldn't Eyewear Be Too?

By Barry Santini, ABOM
Monday, July 15, 2013 12:00 PM Everyone knows human eyesight is variable in nature. Whether it be yearly, weekly or hourly—vision is fluid.

Stop the Mirror Confusion

By Norm Kester, Quantum Innovations
Friday, May 24, 2013 6:23 PM "Is that mirror a Flash or a Dielectric?" "All bright mirrors are metal mirrors." Have you heard these or maybe said them yourself?

Is Your AR Coating Stressed Out?

By Norm Kester, Quantum Innovations
Wednesday, May 08, 2013 4:37 PM I have had many conversations through the years regarding Cracking and Crazing of AR coating, and what causes each. In this article, I want to discuss several of the things that lead to Cracking and Crazing in an effort to understand the relationship between the lens, the layers of the coating and the coating as a whole.

Choosing Base Curves

By Brian Boddy, ABO-AC, Acoma Optical, Mark Mattison-Shupnick, ABOM
Tuesday, March 12, 2013 5:53 PM Base curves, we've learned are an effective way to provide adequate vision, over the entire lens, for a range of sphere and cylinder prescriptions.

AR... No Better Time to Jump In

By Julie Bos
Wednesday, March 06, 2013 8:30 AM Whether you’re considering in-house AR coating for the first time or have been doing it for years, the world of AR coating is continually evolving. Find out what’s new in equipment and formulations.
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