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Thread: Poly photochromic "crackling" .

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    Confused Poly photochromic "crackling" .

    Who might know the cause of poly lenses, mostly progressives which are photo-chromatic, to "crackle" on the front surface? They look like the bottom of a lake that has dried up. I'm sure many of you have seen this. My lab I use say it if from extreme temperature changes. By the way, they don't have AR on them. Thanks for any input.

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    i've seen this a lot in LifeRX lenses?
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    Master OptiBoarder MakeOptics's Avatar
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    Quote Originally Posted by Christine Murtha View Post
    Who might know the cause of poly lenses, mostly progressives which are photo-chromatic, to "crackle" on the front surface? They look like the bottom of a lake that has dried up. I'm sure many of you have seen this. My lab I use say it if from extreme temperature changes. By the way, they don't have AR on them. Thanks for any input.
    I have seen it as well, it's transitions not the VE lenses. I pointed it out to the transitions rep and she said that she has never heard of this before which was an outright lie since I have heard many folks mention it and the lab seems to know that it happens. I have been talking to my lab and we are hoping to switch to photofusion by Zeiss the lens looks promising if I can only get our lab to produce the in house digital on the SV blank I'm set.
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    Yes, it has been transitions with the essilor lenses.

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    Master OptiBoarder MakeOptics's Avatar
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    Quote Originally Posted by Christine Murtha View Post
    Yes, it has been transitions with the essilor lenses.
    I'm wondering if it's the TD2 or their hard coat?
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    We process all types of photochromatics and must say the VE delamination has been resolved..have not had one returned for this reason in some time. We process groove and drill jobs whenever possible in trivex transitions. I believe the issue raised in the this thread is heat or temp related. I have a friend who is a chef and his trns are al dente in a matter of weeks. I would say it is a poly transitions issue with the chromatic film.

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    Master OptiBoarder MakeOptics's Avatar
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    Quote Originally Posted by PRECISIONLAB View Post
    We process all types of photochromatics and must say the VE delamination has been resolved..have not had one returned for this reason in some time. We process groove and drill jobs whenever possible in trivex transitions. I believe the issue raised in the this thread is heat or temp related. I have a friend who is a chef and his trns are al dente in a matter of weeks. I would say it is a poly transitions issue with the chromatic film.
    Thank you for the comment, it is mainly the poly trans that exhibits this issue and it looks like a dried lake bed. The VE lenses still have issues as of a year ago, I gave up on them due to the delaminations I mainly stick to trivex in a FT to avoid having to go with the VE product. I might have to try a high heat and quench to see if I can simulate the issue with a set of cull lenses.
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    Thank you to all who gave feedback on this issue.

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    Quote Originally Posted by MakeOptics View Post
    I'm wondering if it's the TD2 or their hard coat?
    It's the hard coat. It happens on Transitions Progressives from vendors other than Essilor as well.
    There are rules. Knowing those are easy. There are exceptions to the rules. Knowing those are easy. Knowing when to use them is slightly less easy. There are exceptions to the exceptions. Knowing those is a little more tricky, and know when to use those is even more so. Our industry is FULL of all of the above.

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    Definitely delamination. I had that problem with photo chomics before. They said it was bad poly at the time. Then recently I had the problem with Kaenon polarized sunglasses. Again it was bad substrate according to them. In addition they were sitting under halogen lighting all day so maybe that had something to do with it.

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    I have also seen this A LOT in LifeRx lenses

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    Quote Originally Posted by WFruit View Post
    It's the hard coat. It happens on Transitions Progressives from vendors other than Essilor as well.
    Transitions ignores the problem and labs don't admit that the problem exists either. I remember Vision Ease tried the same thing but was held accountable, transitions is just ignoring the problem.
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    We have seen this with LifeRx which I do know some places have misled people thinking they are getting Transitions lenses but are actually LifeRx. I have not seen this in any true Transition lenses, at least not yet. We usually automatically assume it's LifeRx. I spoke with our lab about 2-3 months ago and said this was still an issue with LifeRx. We avoid the LifeRx pretty much all together because of this.

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    Poly cannot be imbibed like other materials and therefore is laminated with the photochromic element. Because Poly is so flexible and not particularly temperature or solvent resistant this regularly de-laminates.

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    It was a huge problem a couple years ago for me with the LifeRx FT bifocals and trifocals. If you catch it within 2 years, it is covered under manufacturer defect warranty. I had to call Vision-Ease and THEN have Vision Ease call my lab to let them know about the 2 year policy. If I have seen any recently, they are all much older than the 2 years....I think most of the wrinkles have been ironed out now, although I use more trivex so it's hard to tell.

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