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Refractive changes after phototherapeutic keratectomy

M Amm, G I Duncker

    Journal of Cataract and Refractive Surgery
    |July 1, 1997
    PubMed
    Summary
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    Phototherapeutic keratectomy (PTK) can cause refractive errors, with hyperopic shifts being the most common. Strategies like larger treatment zones and careful ablation depth management can mitigate these changes.

    Area of Science:

    • Ophthalmology
    • Corneal Surgery
    • Refractive Error Analysis

    Background:

    • Phototherapeutic keratectomy (PTK) is a surgical procedure to treat corneal irregularities.
    • Understanding refractive outcomes post-PTK is crucial for patient management.

    Purpose of the Study:

    • To evaluate refractive error changes following phototherapeutic keratectomy (PTK).

    Main Methods:

    • Utilized the MEL 60 excimer laser for PTK in 45 patients with diverse corneal conditions.
    • Assessed refractive errors, keratometry, and corneal topography pre- and post-operatively.
    • Follow-up extended up to 24 months.

    Main Results:

    • 26 patients maintained stable refractions post-PTK.

    Related Experiment Videos

  • 13 patients experienced a hyperopic shift, with one reaching +4.0 diopters.
  • Seven patients showed increased astigmatism; three had a myopic shift.

    • Conclusions:

    • PTK can induce various refractive changes, most notably hyperopic shifts.
    • A correlation exists between hyperopia degree and ablation depth.
    • Preventive measures include large treatment zones, polishing programs, and staged treatments.