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Thread: polarization axis tolerance for reputable brand polarized sunglasses?

  1. #1
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    polarization axis tolerance for reputable brand polarized sunglasses?

    Hello,

    Last week i bought a polarized pair of sunglasses from a reputable manufacturer. The first thing i noticed when i wore them outside that i was seeing the reflections more pronounced in one eye. And i was also seeing reflections from different parts of a reflective surface in each eye, like curved car bodies and windows. I later in the day checked the glasses against a computer screen and saw the polarizing axes were off slightly.

    Next day i returned the glasses and told the seller that the lenses were cut wrong and it was difficult for me to wear them, they will check it.

    It is the first time i got a pair of branded polarized sunglasses and i was really disappointed. Normally when i cut polarized lenses, i try to align them within one degree of tolerance so me or my customer wouldn't be disturbed by the weird looking glares.

    I checked the forum for previous discussions about the topic and people say that 5 degrees of axis tolerance is okay.

    In the attached photo you can see the slight difference between each lens against an lcd screen.

    So is it me that is more sensitive to such differing glares in each eye or should i expect the brand to be normally much better and ask for a replacement?
    Attached Thumbnails Attached Thumbnails IMG_20190613_161256.jpg  

  2. #2
    Master OptiBoarder OptiBoard Silver Supporter Barry Santini's Avatar
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    Tolerance is tolerance

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    Quote Originally Posted by Barry Santini View Post
    Tolerance is tolerance
    Yeah it is, but how much? 0.5? 1? 2? 5? 10? Is it normal for me(and probably some other people) to find a pair unusable which was manufactured within the tolerances? Looking at the asphalt, water reflections and any shiny surface was just very disturbing for me.

  4. #4
    OptiWizard
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    I think Barry means that if you can't tolerate it, it is out of tolerance, no matter what the axis difference is.

  5. #5
    One eye sees, the other feels. OptiBoard Gold Supporter
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    Axis of polarization

    If there is a marking on the spectacle lens indication the intended direction of horizontal orientation of polarization, then the actual plan [sic] of transmittance shall be at 90 ± 3° from this marking.

    https://www.thevisioncouncil.org/sit...rence%20v2.pdf

    Hope this helps,

    Robert Martellaro

    Plane, not plan. The opposite of Lense, where the e stands for error.


    Last edited by Robert Martellaro; 06-18-2019 at 05:01 PM.
    Roberts Optical Ltd.
    Wauwatosa Wi.
    www.roberts-optical.com
    ~~~~~~~~~~~~~~~~~~
    Science is a way of trying not to fool yourself. - Richard P. Feynman

  6. #6
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    thanks for the info, i'll return the glasses since they are way too off

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