By Tina Lahti, ABOC
In Part 1 we learned that the individual designs of digital lenses take into account not just the prescription, but Position of Wear measurements, resulting in compensated power. In Part 2 we discussed which measurements are necessary, when to use default measurements, and lensometer power versus power to the wearer. Concluding the series, learn why your lab is your best resource for solving non-adapt issues.
Trouble shooting can be difficult with digital lenses
Commonly available digital processing technology is more advanced than commonly available inspection technology. The ability of opticians and even laboratories to find an error is limited. While it’s tempting to blame design or material for non-adapts the most common issues found during lab qualification are invalid execution of the calculated design, misalignment of the design relative to the PAL engravings, and processing errors caused by equipment. None of these things can be detected with a lensometer in an optical shop. It is very difficult to consistently make good digital lenses. Labs must rely on design companies to help them find issues regardless of the cause. Non-adapts on digital lens should always be discussed with the lab prior to assigning cause. A clue that a lab can consistently make good digital lenses is that they are qualified to process dual sided designs. Dual sided digital are the most advanced lenses on the market. If a lab can pass the rigid qualification standards required for dual sided designs, they are probably very good at what they do.
Don’t be afraid of compensated lenses
Though the technology can pose a few challenges for labs and opticians, the benefits to most wearers are obvious. Like polarization and new AR coatings, a clear majority of patients will have a wonderful experience the first time they try this innovative technology, and are unlikely to ever go back to standard progressive lenses.