How to ask optician to round off edges of lenses?

Discussion in 'Optometry Archives' started by A.G.McDowell, Dec 8, 2007.

  1. A.G.McDowell

    A.G.McDowell Guest

    I expect to order a new pair of glasses shortly. I need strong concave
    lenses. Twenty years ago, when I didn't need quite such a strong
    prescription but high refractive index glass didn't exist, I had 'coke
    bottle' style glasses, with parts of the lenses near my nose ground
    flat. I didn't see through that bit, so it had no practical effect on
    the view, but if it hadn't been done the sharp edges there would have
    stopped me from wearing them, or at least made them uncomfortable and
    dangerous.

    Last year I paid far too much for a pair of glasses with lenses that are
    9mm thick near the nose, making them uncomfortable to wear, even after I
    had taken them back for them to try again to get the lenses mounted in
    the frame (they admit they botched this the first time). There has been
    very little material shaved off, just enough to avoid having a razor
    sharp edge. I suspect that shaving off material here is no longer
    required often enough for them to do it routinely. Is there a phrase I
    should use to ask for it, or do I just point at last year's pair and say
    "please don't do this again"?
     
    A.G.McDowell, Dec 8, 2007
    #1
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  2. A.G.McDowell

    Mark A Guest

    You need to be careful about beveled or polished edges, because they can
    sometimes allow light to enter the edge of the lens and cause glare.

    It would help to know your Rx, but assuming it is fairly strong, then you
    probably want a 1.67 index or higher lens with a aspheric design to keep the
    lens reasonably thin at the edges.
     
    Mark A, Dec 8, 2007
    #2
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  3. A.G.McDowell

    A.G.McDowell Guest

    Thanks for that. My current prescription is about -18 dioptres with +2
    dioptres of cylinder on both eyes. The problem pair of glasses have high
    refractive index plastic lenses. The year before last I had glass lenses
    which I am currently wearing instead, and don't have this problem -
    they're about 6.5mm thick near the nose. I ask for plastic lenses if
    possible, because I ride a bicycle and worry about broken glass near my
    eyes if I come off. Last year the optician said they could do them in
    plastic. The year before last a different optician had said I had to
    have glass. Maybe I should go for glass again. Certainly there is
    nothing to be gained by cycling with glass lenses in an out of date
    prescription.
     
    A.G.McDowell, Dec 9, 2007
    #3
  4. A.G.McDowell

    Mark A Guest

    You are probably going to want (or need) at least a 1.74 index lens. These
    can be very thin at middle, so I would avoid glass if possible.
     
    Mark A, Dec 9, 2007
    #4
  5. A.G.McDowell

    Jan Guest

    A.G.McDowell schreef:
    Consider an Adidas frame, several frame's have the possibility of a tiny
    insert frame which you "click" at the backside.
    Use high index plastic glasses (1.74)
    The above is mentioned for using in sport.

    Maybe this helps,

    Jan (normally Dutch spoken)
     
    Jan, Dec 10, 2007
    #5
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