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Related Experiment Videos

Astigmatic changes after excimer laser refractive surgery.

Susan H Yang1, Russell N Van Gelder, Jay S Pepose

  • 1Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, USA.

Journal of Cataract and Refractive Surgery
|April 26, 2002
PubMed
Summary

Spherical photorefractive keratectomy (PRK) often induces astigmatism, unlike LASIK. Astigmatic PRK and LASIK effectively reduce existing astigmatism, though astigmatic LASIK may result in a random axis.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Surgery

Background:

  • Excimer laser surgery, including photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK), are common refractive procedures.
  • Understanding the induced astigmatic changes is crucial for optimizing surgical outcomes and patient satisfaction.

Purpose of the Study:

  • To compare the astigmatic changes induced by spherical and astigmatic excimer laser procedures: PRK and LASIK.
  • To evaluate the impact of spherical vs. astigmatic ablation profiles on postoperative astigmatism.

Main Methods:

  • Retrospective analysis of 3-month refractive data from 317 eyes undergoing spherical PRK, astigmatic PRK (A-PRK), spherical LASIK, and astigmatic LASIK (A-LASIK).
  • Procedures performed by a single surgeon using VISX lasers over a 2-year period.

Related Experiment Videos

  • Focus on changes in absolute astigmatism and the qualitative nature of astigmatic shifts.

    • Main Results:

    • Spherical PRK induced a mean change of +0.15 D in absolute astigmatism and tended to cause with-the-rule (WTR) astigmatism.
    • Spherical LASIK resulted in a mean change of -0.07 D and was astigmatically neutral.
    • A-PRK and A-LASIK achieved significant astigmatism reduction (-1.02 D and -1.28 D, respectively).
    • Qualitative astigmatic changes differed between PRK-based and flap-based (LASIK) procedures.

    Conclusions:

    • Spherical PRK is more prone to inducing astigmatism, particularly WTR, compared to spherical LASIK.
    • Spherical LASIK demonstrated minimal impact on astigmatic magnitude or axis.
    • Astigmatic PRK and LASIK effectively corrected preoperative astigmatism along its original axis.
    • A-LASIK showed a tendency to induce a random resultant astigmatic axis in many patients.