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Not infrequently, I happen upon articles and such that contain statements of questionable accuracy. Now, I'm sure that these authors generally have the best intentions, and may have even done a bit of "homework." I'm not trying to pick on them. But some "myths," "half-truths," and "rules of
Here's another all-around goodie lead by the great Darryl MeisterHave I told you today how much I hate poly?
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This is a good one to discuss progressive designs: https://www.optiboard.com/forums/sho...ountain+design
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Threads about tinting that I found helpful:
OK, here's what I think I know: 1. Some substrates aren't inherently tintable, like polycarbonate, and only the scratch coat tints. 2. Therefore, there are tintable (softer?) coatings put on some of these lenses, so you can get a decent tint. Otherwise it's pretty poor tint absorption. 3. Some substrates tint easily, e.g.
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Progressives explained & "Swim"
Progressives for smarter than "Dummies".
From 2005- A Dr. Sheedy article on PAL's and Minkowitz's Theorem I find interesting and not found with a search of the OB. Correct me if I'm wrong- but isn't this broadly speaking why Position of Wear compensated lenses are more often a better lens? Can a guru chime in with a clarification of the last sentence from the
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I don't think many of us can do this trick, but it's so impressive that it needs immortalized.
I have a patient who absolutely needs this plastic frame, for a variety of legit reasons. The frame is "close" to a nice bridge fit, but is a little larger than ideal, and it could cause a problem with the optics. I need to either attach a nosepad assembly or shrink the bridge (preferably). I know that you can
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I have been reading a lot about the free form PALs, but what I don’t understand is the issue about the base curve. It is clear to me that these base-curve-series are not needed anymore, as they were for the traditional PALs. Nowadays the companies write something like “... each Rx has its own ideal base curve...”, which is true
A brain-busting dialogue between two optical heavyweights.
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I do not understand why we don't have to consider Rx lens thickness when measuring fitted back vertex distance. Especially in a high plus lens the thickness is significant and the "back" of the lens is much closer to the cornea then the demo lens. Can someone smarter than me please explain?
All you could hope to know about vertex distance.
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June 2020- Zeiss lens options:
OK, so now I'm hearing that VSP's effective ban on Essilor products is going to allow only Unity Via (formerly a Zeiss product from what I hear) and Hoya and Zeiss. So an OD that has sucked at the teat of, say, Shamir is going to find that he's going to get his reimbursements cut. That would be me. So I would like to learn
I got a feeling in September I may be referencing this often.
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https://www.optiboard.com/forums/showthread.php/69836-Tintable-high-index-lenses?p=559765#post559765OK, here's what I think I know: 1. Some substrates aren't inherently tintable, like polycarbonate, and only the scratch coat tints. 2. Therefore, there are tintable (softer?) coatings put on some of these lenses, so you can get a decent tint. Otherwise it's pretty poor tint absorption. 3. Some substrates tint easily, e.g.
This is a good reference thread on how tinting is done on different materials. (Warning: colorful language)
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Hydrophobicity Oleophobic Coating...
How good is the top coat of an AR?
https://www.optiboard.com/forums/showthread.php/72046-Hoya-lenses-getting-dirty-quickly
Added this thread 01/29/2021 Insufficient uv curing of coats with picture of lens and test for lab techs:
https://www.optiboard.com/forums/showthread.php/66245-OptiBoard-Hall-of-FameLast edited by Uncle Fester; 01-29-2021, 02:52 PM.
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