uneven polarized sunglasses

Discussion in 'Glasses' started by porf67, Aug 2, 2006.

  1. porf67

    porf67 Guest

    Hi folks,

    I recently purchased a new pair of perscription sunglasses with
    polarized lenses. (They weren't cheap ones, ether...) The
    polarization on the lenses seem very uneven to me. If I look at a
    clear blue sky, I can see that the lenses looks splotchy, as if the
    direction of the polarization was not uniform throughout them. I see
    this as well if I examine them with a polarized camera filter.

    I've had polarized glasses before, and I've not noticed this, although
    it's not something I explicitly looked for. This pair seems
    particularly distracting - I've actually had these redone by the lab,
    with similar results both times.

    Before I take these back again, I'd like to know if I'm expecting too
    much. More specifically:
    - In general, how even should the polarization on perscription
    sunglasses be?
    - How much should a strongish perscription (~-5) affect the evenness of
    the polarization?
    - Would the fact that these are high IOR lenses affect how even a
    result I can expect?

    Thanks for any insight,
    porf67, Aug 2, 2006
    1. Advertisements

  2. porf67

    porf67 Guest

    Thanks for the response - it's very helpful. I'm aware of the effects
    you mention (stress patterns on glass, etc.) and this is entirely
    different. I guess they're going back again. Bleh.

    Thanks again.

    porf67, Aug 2, 2006
    1. Advertisements

  3. porf67

    David Combs Guest


    Not none with me!

    Looking at any kind of glare via reflection shows it --
    especially via tilting the head back and forth (left-right) --
    HUGE and OBVIOUS difference.

    Something in physics about non-porarized light, when
    reflected, or maybe glancing reflection, gets polarized
    at right angles to the plane of something -- was LONG ago,
    that course.

    And that effect is the *reason* for buying polarized
    glasses, for reduced glare reflected from highway when
    driving eg into setting sun.

    Ditto for piercing sky-reflection when looking at angle
    into eg a fishing-stream -- can see fish, bottom, etc
    much clearer.

    At least that's my experience -- although maybe not everyone's.


    David Combs, Aug 19, 2006
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.