Non-corneal astigmatism?

Discussion in 'Optometry Archives' started by The Real Bev, Nov 2, 2007.

  1. The Real Bev

    The Real Bev Guest

    My opththalmologist also fits contacts, so she said she'd look at my
    corneas. Average thickness, but most of my astigmatism comes from elsewhere
    in the eye. She sounded like it was NOT an easy thing to determine other
    astigmatism sources so I asked no further questions. I should have, and I
    will when I go back in 6 months or when my current set of lenses dies.

    Anybody know what she meant?

    --
    Cheers, Bev
    =======================================================================
    "Windows Freedom Day: a holiday that moves each year, the date of which
    is calculated by adding up the total amount of time a typical person
    must spend restarting windows and then determining how many work weeks
    that would correspond to." -- Trygve Lode
     
    The Real Bev, Nov 2, 2007
    #1
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  2. The Real Bev

    p.clarkii Guest

    really it's impossible to get more precise than she told you. our
    current state of technology allows us to discern whether astigmatism
    is caused by corneal toricity, or "other non-corneal" causes. the
    most likely non-corneal causes are due to changes in the lens such as
    equatorial tilting, or possibly misalignment of the optical center of
    the lens compared to that of the cornea. your doctor is telling you
    the truth, and regardless the treatment is the same.
     
    p.clarkii, Nov 2, 2007
    #2
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  3. The Real Bev

    Dr Judy Guest

    What she meant was that the amount of astigmatism in your glasses is
    not the same as the amount on your cornea. There is no easy way to
    measure astigmatism from the lens or due to toricity of the back
    surface of the cornea or of the retina, so she doesn't know for sure
    where the astigmatism is coming from. The lens is the most likely
    source.

    It means that standard rigid lens won't work and you will need toric
    rigid or toric soft lenses.

    Judy
     
    Dr Judy, Nov 2, 2007
    #3
  4. The Real Bev

    The Real Bev Guest

    Thanks, that's a good enough explanation. "If it isn't here, we haven't a
    clue where else it's coming from." I was envisioning something like a
    twisted eyeball.
    No toric RGPs (I tried 8 sets) worked and most of the toric softies don't
    work, even if the trial lens did :-(.
     
    The Real Bev, Nov 3, 2007
    #4
  5. The Real Bev

    The Real Bev Guest

    Rats, I didn't finish... She said my corneas were of average thickness, so
    that probably means that lasik is probably out of the question because they
    would have to add compensatory correction instead of just smoothing it out.
    Right?
     
    The Real Bev, Nov 3, 2007
    #5
  6. The Real Bev

    Guest Guest


    Not necessarily, there's always epi-lasik or PRK. Either one would
    leave you with plenty of cornea.
     
    Guest, Nov 4, 2007
    #6
  7. The Real Bev

    Dr Judy Guest

    Not sure what you mean by add correction -- are you hyperopic?

    LASIK can correct non corneal astigmatism, if that is what you are
    asking. Whether or not your average thickness cornea is thick enough
    for LASIK depends upon the exact thickness, pupil size, your exact
    prescription, whether custom abalation is needed, laser used, and the
    type of surgery (LASIK, LASEK, PRK ....). A laser centre will be able
    to tell you and initial consults are often free.

    Judy
     
    Dr Judy, Nov 4, 2007
    #7
  8. The Real Bev

    The Real Bev Guest

    Yeah. I meant that the cornea would have to be carved to counteract
    whatever was causing the rest of the astigmatism instead of just being
    nicely smoothed out. Nothing is ever simple.
    I'm satisfied with my ophthalmologist -- she frowned and said "That's
    something else entirely..." which sounds like a negative opinion to me. I'm
    not thinking about it seriously, just as a back-of-my-mind possibility.

    --
    Cheers, Bev
    =============================================
    You need only two tools: WD-40 and duct tape.
    If it doesn't move and it should, use WD-40.
    If it moves and shouldn't, use duct tape.
     
    The Real Bev, Nov 5, 2007
    #8
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