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Related Experiment Videos

Excimer laser photorefractive keratectomy for hyperopia

D Dausch1, Z Smecka, R Klein

  • 1Department of Ophthalmology, Marienhospital, Amberg, Germany.

Journal of Cataract and Refractive Surgery
|March 1, 1997
PubMed
Summary

Enlarging the treatment zone for hyperopic photorefractive keratectomy (PRK) to 9.0 mm improved refractive outcome predictability. This PRK approach demonstrated efficiency and safety for hyperopia correction up to +8.25 D.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Surgery

Background:

  • Hyperopic photorefractive keratectomy (PRK) aims to correct farsightedness.
  • Achieving consistent refractive outcomes in hyperopic PRK can be challenging.
  • Enlarging the treatment zone is a potential strategy to improve PRK outcomes.

Purpose of the Study:

  • To evaluate the refractive predictability and visual outcomes of hyperopic PRK using an enlarged 9.0 mm treatment zone.
  • To assess the safety and efficacy of this modified PRK technique for moderate to high hyperopia.

Main Methods:

  • A prospective clinical study involving 68 hyperopic eyes (62 patients) undergoing PRK with a 9.0 mm treatment zone.
  • Excimer laser (MEL 60) used for corrections ranging from +2.00 D to +8.25 D.

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  • Follow-up extended to 12 months, assessing predictability, safety, and efficacy.

    • Main Results:

    • At 12 months, 81% of eyes achieved predictability within 1.00 D and 59% within 0.50 D of intended correction.
    • Best corrected visual acuity was maintained or improved in 92% of eyes.
    • Efficacy was high, with 97% achieving uncorrected visual acuity of 20/40 or better, and 40% achieving 20/20.

    Conclusions:

    • Photorefractive keratectomy utilizing a 9.0 mm treatment zone is effective and safe for hyperopia up to +8.25 D.
    • The procedure offers good predictability, contributing to successful refractive outcomes.
    • Attention to optical zone centration is crucial for optimizing results in hyperopic PRK.