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Br J Ophthalmol 2009;93:1634-1638 doi:10.1136/bjo.2008.152579
  • Original Article
  • Clinical science

One-year outcomes of a bilateral randomised prospective clinical trial comparing PRK with mitomycin C and LASIK

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  1. A D Wallau,
  2. M Campos
  1. Vision Institute, Federal University of São Paulo Department of Ophthalmology, São Paulo, Brazil
  1. Correspondence to Dr A D Wallau, R Vaz e Silva, 41, 91040-150, Porto Alegre, RS, Brazil; anewallau{at}hotmail.com
  • Accepted 26 May 2009
  • Published Online First 4 November 2009

Abstract

Aim: To compare 1-year follow-up results of photorefractive keratectomy (PRK) with mitomycin C (MMC) and laser in situ keratomileusis (LASIK) for custom correction of myopia.

Methods: Eighty-eight eyes of 44 patients with moderate myopia were randomised to PRK with 0.002% MMC for 1 min in one eye and LASIK in the fellow eye. The 1-year follow-up was evaluated.

Results: There were no differences between LASIK and MMC-PRK eyes preoperatively. Forty-two patients completed the 1-year follow-up. MMC-PRK eyes achieved better uncorrected visual acuity (p = 0.03) and better best-spectacle-corrected visual acuity (p<0.001) 1 year after surgery. SE did not differ in the two groups during follow-up (p = 0.12). Clinically significant haze was not found in surface ablation eyes. LASIK eyes showed a greater higher-order aberration (p = 0.01) and lower contrast sensitivity (p<0.05) than MMC-PRK eyes postoperatively. Excellent vision was reported in 64% of LASIK and 74% of MMC-PRK eyes 1 year after surgery. The corneal resistance factor and corneal hysteresis (ORA, Reichert) were higher in LASIK than in MMC-PRK eyes (p<0.01) at the last follow-up.

Conclusions: Wavefront-guided PRK with 0.002% MMC was more effective than wavefront-guided LASIK for correction of moderate myopia. Further research is necessary to determine the optimal concentration, exposure time and long-term corneal side effect of MMC.

Footnotes

  • Presented at the European Society of Cataract and Refractive Surgery (ESCRS), Stockholm, September 2007.

  • Competing interests None.

  • Ethics approval This study was approved by the Ethics Committee of Federal University of São Paulo.

  • Patient consent Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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  • At a glance:At a glance Br J Ophthalmol 2009;93:idoi:10.1136/bjo.2009.174938
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