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Thread: Question about polarized lenses

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    Question about polarized lenses

    If I were to edge polarized trivex lenses for a silhouette style compression drill mount, would it be likely to de-laminate or should that be pretty safe? I haven't dealt much with edging polarized lenses outside of hide-a-bevel yet. Thanks!

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    OptiBoard Apprentice OptiBoard Silver Supporter Optical Roy's Avatar
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    I have not had any such issues with Trivex de-laminating in that set up.
    Roy W. Jackson, Sr. ABOC

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    Quote Originally Posted by Optical Roy View Post
    I have not had any such issues with Trivex de-laminating in that set up.
    +1

    Neither have I.

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    Trivex and Poly modern polarized lenses have very little delamination in my experience regardless of processing, much better products than 10 years ago imho. (At least with the manufacturers I use)

    Hi index resin lenses, while beautiful, have a bit more risk of delamination during mounting, CR39 has the worst delamination now days.

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    Polarized lenses contain a laminated filter that allows only vertically oriented light to pass through. This blocks the horizontally oriented light so that glare is almost eliminated. The most common colors of polarized lenses are gray and brown.

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    Compulsive Truthteller OptiBoard Gold Supporter Uncle Fester's Avatar
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    fwiw-
    The shop I worked at in the later 70's had us and several others test the new cr-39 lenses as Polaroid Corp. was based nearby. When they first got introduced they almost all delaminated after a few months.

    Dr. Land put the best minds in the business to work and they fixed it within a year or so.

    Drilled CR-39 (Poly lenses were not created yet) however, always remained an issue.

    peter- You can perform a neat party trick for optical geeks to demonstrate how the crystal aligns to block phased light, on the polarizing film, by talking a small sheet of plastic wrap with 2 dowels at each end to create an open scroll.

    Scatter some uncooked rice grains over the wrap and then use the dowels to stretch the plastic and watch the rice align in one direction.

    This makes that "partially open Venetian blind" effect that I use to describe what polarization does to patients.

    I think I first read about this trick here on OB near when I first joined. Anyone remember what that crystals name is?
    Last edited by Uncle Fester; 10-15-2020 at 09:05 AM. Reason: added thought...

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    I've always said/read iodine crystals. The interwebs more specifically say iodoquinine sulphate or herapathite. I have never heard those names until just now. I think I'll stick with Iodine crystals.

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    I'm a big advocate for trivex but I do find it delaminates a lot more than poly. My experience is based mainly on drivewear, and glazing into supras though.

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    Quote Originally Posted by Robert_S View Post
    I'm a big advocate for trivex but I do find it delaminates a lot more than poly. My experience is based mainly on drivewear, and glazing into supras though.
    It definitely does, poly by far is the most durable polarized lens (glass excluded)

    Even patients who I use trivex for their clear lenses I will sometimes use poly for their sunwear depending on rx and frame because in many instances it is a superior choice.

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    Glad it's not just me!

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