Clinical outcomes of Transepithelial photorefractive keratectomy to treat low to moderate myopic astigmatism

BMC Ophthalmol. 2018 May 9;18(1):115. doi: 10.1186/s12886-018-0775-5.


Background: To evaluate the refractive and visual outcomes of Transepithelial photorefractive keratectomy (TransPRK) in the treatment of low to moderate myopic astigmatism.

Methods: This retrospective study enrolled a total of 47 eyes that had undergone Transepithelial photorefractive keratectomy. Preoperative cylinder diopters ranged from - 0.75D to - 2.25D (mean - 1.11 ± 0.40D), and the sphere was between - 1.50D to - 5.75D. Visual outcomes and vector analysis of astigmatism that included error ratio (ER), correction ratio (CR), error of magnitude (EM) and error of angle (EA) were evaluated.

Results: At 6 months after TransPRK, all eyes had an uncorrected distance visual acuity of 20/20 or better, no eyes lost ≥2 lines of corrected distant visual acuity (CDVA), and 93.6% had residual refractive cylinder within ±0.50D of intended correction. On vector analysis, the mean correction ratio for refractive cylinder was 1.03 ± 0.30. The mean error magnitude was - 0.04 ± 0.36. The mean error of angle was 0.44° ± 7.42°and 80.9% of eyes had axis shift within ±10°. The absolute astigmatic error of magnitude was statistically significantly correlated with the intended cylinder correction (r = 0.48, P < 0.01).

Conclusions: TransPRK showed safe, effective and predictable results in the correction of low to moderate astigmatism and myopia.

Keywords: Astigmatism; Myopia; Transepithelial photorefractive keratectomy.

MeSH terms

  • Adult
  • Astigmatism / surgery*
  • Female
  • Humans
  • Lasers, Excimer
  • Male
  • Myopia / surgery*
  • Photorefractive Keratectomy / methods*
  • Refraction, Ocular
  • Retrospective Studies
  • Visual Acuity
  • Young Adult