Ortho-K - Max correction zone

Discussion in 'Optometry Archives' started by Scot, Sep 26, 2006.

  1. Scot

    Scot Guest

    Hey all, I am back again. Just looking for another quick pointer with
    a few more facts.

    Ortho k patient, using euclid lenses.
    history: Experiencing glare at night.
    Cause: Correction zone is not large enough

    I have had a second opinion and additional topography shots taken via a
    doctor that supports Paragon CRT, just to get a true alternate
    position. I am currently maxed on the euclid correction zone, and the
    paragon consultants state that their max is similar. Fit is "good" and
    centration is spot on when I sleep in my lenses. They do decenter a
    bit towards the medially? (towards my nose) if I wear the lenses while
    awake, but since I only wear them while sleeping it is not an issue.

    So I am seeking the wisdom of the crew. My iris's measure 6.5mm in
    moderate to dark light and my lenses are 11mm with a 6.6 correction

    Anyone know of a lens system that can correct a larger zone? Base
    prescription is -2.25/-2.5 with a slight astigmatism in one eye. Well
    within the limits (-.25)

    Please: no responses if you are not a doctor or have valuable
    information about OK.

    BTW: BE Retainer states that their curve "seems" to treat a larger
    area, but unfortunately there are no doctors supporting the BE system
    in my area. Anyone have any first hand knowledge?
    Scot, Sep 26, 2006
  2. Scot

    Dr. Leukoma Guest

    Can nobody design a custom lens for you to go another 0.5mm larger?

    Dr. Leukoma, Sep 27, 2006
  3. Scot

    Scot Guest

    Both paragon CRT and euclid state that 11.000/6.600 is the max that
    their lenses can go and remain useful, even with a fairly low beginning

    (11.000/6.600 0.000(1.000) 8.590 and 8.430 in the other eye if it
    Scot, Sep 27, 2006
  4. Scot

    Dr. Leukoma Guest

    Dr. Leukoma, Sep 27, 2006
  5. Scot

    Scot Guest

    I read through that and it seems that the formulas are saying 7mm is
    possible, but that it may fade too quickly or not correct enough even
    with my prescription.

    That being said, the manufacturers (euclid and paragon) both state that
    they only go up to 6.6 and that more would not help in my situation.
    This leaves me at a bit of quandry and what I am curious about is more
    on the other brands that are available with different curves. Being an
    end user the information is very difficult to come by.

    Scot, Sep 28, 2006
  6. Scot

    Dr. Leukoma Guest

    Indeed, it will. The manufacturers have to have their designs approved
    by the FDA, and so cannot veer from their designs. Therefore, you will
    have to seek out a private OD who will go out on a limb for you and
    design a custom lens, and you will have to give him your consent to

    Dr. Leukoma, Sep 28, 2006
  7. Scot

    Ace Guest

    Are yours too small a zone? My orthoK practitioner said he can go up to
    8mm zone!
    If my math is right, an 8mm zone would correct up to -2 diopters. Youd
    be 20/25 instead of 20/20 then.
    Ace, Oct 12, 2006
  8. Scot

    serebel Guest

    Ignore the retard here, he has no OK doc, has no education, lives in
    his mommie's basement, no job, and no future.
    serebel, Oct 12, 2006
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