Wavefront lasik and floaters

Discussion in 'Laser Eye Surgery' started by Richard Schumacher, Aug 31, 2003.

  1. How can floaters not mess up wavefront lasik? It seems to me that the
    procedure would just smear out their effects and make that smearing a
    permanent degradation in the correction.
    Richard Schumacher, Aug 31, 2003
    1. Advertisements

  2. Floaters, and other anomalies, can cause the wavefront analysis to
    fail. The systems are designed to recognize such artifacts and ignore
    them, interpolate around them, or abort the diagnostic.

    The Hartman-Schack wavefront technology has the same limitation with
    patients who have highly opacified cataracts or highly irregular
    corneas. The ray-tracing wavefront technology (Tracey Technologies)
    does not suffer from this same limitation.

    If a person has too many floaters, cataract, irregular cornea, etc,
    Hartman-Schack wavefront will not provide an analysis, but ray tracing

    Glenn Hagele
    Executive Director
    Council for Refractive Surgery Quality Assurance
    glenn dot hagele at usaeyes dot org

    I am not a doctor.
    Glenn Hagele - Council for Refractive Surgery Qual, Aug 31, 2003
    1. Advertisements

  3. Ray tracing is a method of calculating the performance of an optical system given a description of each of
    the elements in the system. Unless there's some new use of the term, it's not a measurement technique. The
    problem for Lasik is determining a useable description of the floaters, which of course are very irregular
    and time-variant. In principle it should be possible to characterize and remove the effects of the floaters
    from the analysis, leaving a correction that would be more-or-less ideal if only the floaters were not
    present, but in practice it would be very difficult.

    I think I'll just have to keep waiting for a safe way to remove floaters. I should live so long...
    Richard Schumacher, Sep 17, 2003
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.