Prospective randomized comparison of simultaneous and sequential bilateral photorefractive keratectomy for the correction of myopia

Ophthalmic Surg Lasers. 2000 Sep-Oct;31(5):400-10.


Background and objective: To evaluate the efficacy and safety of simultaneous bilateral photorefractive keratectomy (PRK).

Patients and methods: There were 52 patients (104 eyes) with myopia less than -6 diopters entered in this prospective trial and randomized to simultaneous or sequential bilateral PRK. Main outcome measures were uncorrected visual acuity (UCVA), percentage of eyes within +/-0.5 D of attempted outcome, present pain intensity (PPI) and total pain rating index (PRI(R)T) scores resulting from McGill the Pain Questionnaire, subjective symptoms, haze, and patient satisfaction. Follow-up extended to 14 months.

Results: There was no significant difference in UCVA (P=0.996) and percentage of eyes within +/-0.5 D of attempted correction (P=0.932). Present pain intensity and PRI(R)T scores were significantly higher in the sequential group (P=0.037; P=0.034). The percentage of satisfied patients after bilateral PRK was significantly higher in the simultaneous group (P=0.036).

Conclusions: Simultaneous bilateral PRK was safe and effective, without any significant difference from sequential treatment.

Publication types

  • Clinical Trial
  • Comparative Study
  • Evaluation Study
  • Randomized Controlled Trial

MeSH terms

  • Adult
  • Cornea / surgery*
  • Female
  • Humans
  • Lasers, Excimer
  • Male
  • Myopia / surgery*
  • Patient Satisfaction
  • Photorefractive Keratectomy / methods*
  • Postoperative Complications
  • Prognosis
  • Prospective Studies
  • Refraction, Ocular
  • Safety
  • Surveys and Questionnaires
  • Visual Acuity