May 2015 Lenses

How Do You Know Your Lens Is The Right Power? (Part Two)

In Part One of this three-part series, I described the history and early use the American Optical (AO) “NBS Truepower lens set” developed in 1916, which was used to assess the calibration of the AO Lensometer when first introduced to the market.

May 2015 Lenses

How Do You Know Your Lens Is The Right Power? (Part One)

I was recently asked what I thought was the most valuable item in the Optical Heritage Museum collection.

April 2015 Lenses

Why Conventional Bifocals Are Reversed To Properly Measure The Addition Power of a Bifocal Lens

The topic of measuring bifocal add powers is a common source of confusion in the industry.

June 2014 Lenses

Being Involved In Our Profession Can Make a Difference

In a previous Opticians Handbook article, I gave a general overview of the evolution of the ANSI Z80.1 standard and how it has changed over time.

February 2014 Lenses

The Evolution of ANSI Z80.1 Spectacle Lens Standards

"I follow ANSI Standards when inspecting mounted lenses prior to dispensing."

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September 2024

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Understanding the Modern Eyewear Consumer

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