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Related Experiment Videos

Corneal sensitivity after photorefractive keratectomy.

M Campos1, L Hertzog, J J Garbus

  • 1Doheny Eye Institute, Los Angeles, CA 90033-1088.

American Journal of Ophthalmology
|July 15, 1992
PubMed
Summary

Photorefractive keratectomy temporarily reduces corneal sensitivity. Sensitivity recovers within months, with faster recovery for astigmatism correction than severe myopia, and no increased risk of complications.

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Area of Science:

  • Ophthalmology
  • Corneal Surgery
  • Refractive Surgery

Background:

  • Corneal anesthesia/hypesthesia can complicate refractive surgery.
  • Excimer laser photorefractive keratectomy (PRK) is a common refractive procedure.
  • Assessing corneal sensitivity post-PRK is crucial for patient outcomes.

Purpose of the Study:

  • To measure corneal sensitivity following excimer laser photorefractive keratectomy.
  • To compare corneal sensitivity recovery in patients with compound astigmatism versus severe myopia.
  • To evaluate the incidence of delayed epithelial healing or recurrent corneal erosions.

Main Methods:

  • Utilized an esthesiometer to measure corneal sensitivity.
  • Compared sensitivity in unoperated corneas and fellow corneas post-PRK.

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  • Monitored patients for up to three months post-surgery.

    • Main Results:

    • Corneal sensitivity decreased significantly within six weeks post-PRK (mean 75.2% of normal).
    • Patients with compound astigmatism recovered 95.7% sensitivity; severe myopia patients recovered 86.2% within three months.
    • No cases of delayed epithelial healing or recurrent corneal erosions were observed.

    Conclusions:

    • Photorefractive keratectomy measurably reduces corneal sensitivity in myopic eyes for several weeks.
    • Corneal sensitivity generally recovers within months, with variations based on refractive error corrected.
    • PRK did not increase the risk of epithelial healing complications during the period of reduced sensitivity.