Silhouette and trivex lenses - question about optics vs. normal lenses

Discussion in 'Optometry Archives' started by AJ, May 3, 2005.

  1. AJ

    AJ Guest

    I just picked up some Silhouette rimless glasses with trivex lenses and
    I am having a hard time adjusting to the optics. I thought the drill
    mounts might take some getting used to but it's been the poor optics
    that have confounded me. My question is, should I be able to notice a
    difference between regular plastic lenes and the trivex lenses in a
    drill mount? The lens shape isn't all that much different (although it
    is slightly wider and slightly less "tall"). My vision with the regular
    lenses (in normal frames) was very good.

    My script is: -3.25 + 1.25 x 10
    -3.00 + 1.00 x 178

    It almost seems like they are making me "cross-eyed" but I also notice
    the bending of lines (upward when looking down through the bottoms) and
    the floor seems much closer to me...sort of magnified. I'm going back
    to the Dr. but thought I would give these a week or so, so I could try
    to observe what might be off.

    Thanks for any help.
    AJ, May 3, 2005
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  2. AJ

    Mark A Guest

    Trivex lenses have very good optics compared to other mid or high index
    lenses and your Rx is not that strong to begin with (which can exacerbate
    optical problems with some lenses). So I do not think it is the lens
    material that is the problem. The lenses may not be placed correctly in your
    frame for where your frame sits on your face, or the Rx could be off, or the
    lens could be made incorrectly.

    It would also help to compare your old and new Rx to see what the difference
    Mark A, May 3, 2005
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  3. AJ

    AJ Guest

    I actually have the same rx in the normal (sola?) lens so I can do a
    pretty good A/B comparison. It's very odd when I do that and it appears
    from the replies so far I shouldn't expect to see that kind of response
    just because of trivex.
    AJ, May 3, 2005
  4. AJ

    Mark A Guest

    Sola is a manufacturer that uses many different lens materials, just like
    Hoya, Younger, Essilor, Rodenstock, etc. I assume your old lenses are
    regular plastic 1.50 (aka CR-39 or hard resin).

    If the Rx is the same, then you should not see that much difference in a
    single vision lens.
    Mark A, May 3, 2005
  5. So the solution is to have a 3rd party do careful lensometry on both
    pair, including marking the optical centers and comparing the distances
    between them (p.d.s). Post the results here. They might also want to
    check the base curves. Oh and one other thought re base curves, do you
    know if you got aspheric or spheric Trivex? The come both ways. If they
    gave you aspheric, that could be the problem, or it could be the solution.

    w.stacy, o.d.
    William Stacy, May 3, 2005
  6. AJ

    AJ Guest

    Thanks for all the input. My doc checked them and they found that the
    PDs were indeed incorrect. They've been sent back to the lab, etc. so
    hopefully they'll get it right this time. It was nice to know I wasn't
    just being a pain in the rear. I'm looking forward to getting these
    back as they truly are remarkable frames - very comfortable.
    AJ, May 9, 2005
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