Base Curves, Power, Diameter Inconsistencies

Discussion in 'Optometry Archives' started by Kyle Taylor, Feb 17, 2004.

  1. Kyle Taylor

    Kyle Taylor Guest


    One year ago. I got a rigid gas permeable from a doctor
    with a spec of

    -8.0 power,
    7.85 base curve
    9mm diameter.

    When I let them re-specify it. They give the power of -8.0 and
    the others are supposed to be similar to the original. When I
    let a second eye doctor re-specify the same lens. He
    stated the laboratory (which differs from the first) indicates
    it is -7.5, 8.0 base curve and 9.2mm diameter. How could 2
    laboratory report different results? Isn't there a standard here
    or does this really happen?? Or is it possible the lens has deformed
    in less than one year?

    Is there a relationship between the following.

    -8.0 power turns into -7.5
    7.85 base curve turns into 8.0
    9mm diameter turns into 9.2



    Kyle Taylor, Feb 17, 2004
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  2. Kyle Taylor

    LarryDoc Guest

    You posted a similar report yesterday, to which I replied. Please read
    that first.

    The lens can "deform" in less than a year, but I've never seen one *grow
    larger* ;-)

    Curiously, though, the effective power and theoretically the fit of the
    two sets of lenses you post here would be nearly the same, possibly
    better. Perhaps the doc wisely made those changes to provide for better
    comfort and eye health? Or the lens design you had previously was not
    available from the second lab and this new one is, perhaps, "new and
    improved"? (If you cannot see as well, then, of course, it is not. ) Or
    a mistake was made. Either way.......

    Why not ask these questions of you eye doctor---you are paying him/her
    for those services and perhaps you don't have the whole picture here.


    Dr. Larry Bickford, O.D.
    Family Practice Eye Health & Vision Care

    The Eyecare Connection
    larrydoc at eye-care-contacts dot com (remove -)
    LarryDoc, Feb 17, 2004
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