Wednesday, June 10, 2015 10:05 AM
I was fortunate to have access to the NBS 1916 calibration set, from which I was able to make my own secondary set, which I still use today. Since I had confidence in their powers, it has proved especially useful. What does one do if there is a need to assess an instrument but one does not have such a set?
Wednesday, May 27, 2015 1:07 PM
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.
Tuesday, May 12, 2015 3:00 PM
I was recently asked what I thought was the most valuable item in the Optical Heritage Museum collection.
Wednesday, April 1, 2015 11:30 AM
The topic of measuring bifocal add powers is a common source of confusion in the industry.
Tuesday, June 10, 2014 3:00 PM
In a previous Opticians Handbook article, I gave a
of the evolution of the ANSI Z80.1 standard and how it has changed over time.
Tuesday, February 11, 2014 3:10 PM
"I follow ANSI Standards when inspecting mounted lenses prior to dispensing."
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.
Monday, February 4, 2013 2:00 PM
In our last installment, it looked like an automated lens meter's arsenal of extreme precision, standards compliance, Abbe value compatibility, lens identification, instant transposition and extensive office-interface capabilities would trump a manual model on any given day.
Monday, January 28, 2013 2:33 PM
When the first automated lens meters arrived on the scene about three decades ago, they were heralded as the way of the future. Extremely precise readings, coupled with the reduced operator error were amongst the initial attractions.
Thursday, January 17, 2013 4:08 PM
There isn't a optical school in the country that doesn't spend a great deal of time training their student on how use a traditional lens meter for lens and prescription verification, and with good reason.
Sunday, November 27, 2011 9:32 PM
Factoid: There are lots of names for lensmeters i.e., the instruments that measure lens power and optical center or prism location. It's a bit like Kleenex.