Wednesday, July 22, 2015 10:11 AM
To many spectacle wearers, lenses are simply two pieces of glass (OK, perhaps some patients have learned that most lenses today are in fact made from plastic materials) suspended in front of their eyes by some type of metal or plastic “holder”.
Wednesday, July 15, 2015 10:11 AM
When compared to CR-39 monomer, lenses made with Trivex material are up to 15 to 20 percent thinner and always about a third lighter. An aspheric design will further reduce thickness and weight. While there are other higher index materials that can make lenses even thinner, lightness depends on final lens volume and its specific gravity.
Wednesday, July 15, 2015 10:08 AM
Let’s now turn our attention to the topic of reference wavelength and the controversy that has been since the formation of International Organization for Standardization (ISO) Standards for ophthalmic lenses in 1979.
Wednesday, July 08, 2015 1:05 PM
In May of 2015, I participated in the latest round of ISO TC172/SC7/WG3 spectacle lens meetings in Shanghai, China. Every 18 months, delegates from around the world meet on a rotating basis in Europe, Asia or the US with the purpose of reviewing and updating standards.
Wednesday, July 08, 2015 10:15 AM
We all have to make cost-benefit decisions on a daily basis. Is it worth going 10 minutes out of your way to get that really good cup of coffee? If you install energy-efficient appliances in your home, will you get that return on investment?
Wednesday, July 08, 2015 10:10 AM
You open the oven door to check your pizza, your glasses fog up. You’re speeding down a ski slope, your glasses and your goggles fog up. You step out of an air-conditioned car into the summer swelter, your sunglasses fog up.
Wednesday, July 01, 2015 10:10 AM
Trivex material’s development has been consistent with the way new technologies build sophistication into products. In the past, a lens material had to be more closely matched with the prescription and the end results wanted. This is no longer the case.
Wednesday, June 24, 2015 10:03 AM
There was excitement at the West Coast Better Vision Conference in Florida on June 5, 2015. POF, the Professional Opticians of Florida Association, introduced the education program “Refraction for Opticians” to their membership.
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, June 10, 2015 10:00 AM
And so we move forward, on to part three of my groundbreaking series on blue blocking lenses, a collection of thoughts and observations that will sure to become part of optical lore and studied by apprentice opticians years down the road...
Wednesday, June 10, 2015 9:58 AM
PPG Industries recently conducted a survey among spectacle wearers in the U.S. that affirmed while consumers are interested in lenses that provide a combination of features, they are unfamiliar with their choices.
Wednesday, June 03, 2015 10:00 AM
Dispensing with the niceties (haha, optical pun!) of a long-winded, winding and witty introduction, I’m just going to get right on to it. After all, we all know why we’re here: This is the Blue Blocker crucible, where lenses are ground down and only the truth remains.
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.
Wednesday, May 20, 2015 11:00 AM
We are in a new age of consumerism. This new consumer desires nothing more than transparency and control of their health care spend.
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.