ABSTRACT
Purpose: This study aimed to evaluate the outcomes of astigmatic correction by single?step transepithelial photorefractive keratectomy (TransPRK) and femtosecond?assisted laser in?situ keratomileusis (Femto?LASIK) surgeries. Methods: A total of 218 subjects received TransPRK or Femto?LASIK surgery for the treatment of myopia and astigmatism (?2.25 to ?0.25 D). Refraction errors and uncorrected (UDVA) and corrected distance visual acuity (CDVA) were examined before and at 3 months after surgery. Astigmatism changes were assessed by vector analysis. Results: Preoperative parameters of the TransPRK group were similar to the Femto?LASIK group. UDVA and CDVA at 3 months were similar between both groups. Manifest refraction (MR) spherical equivalent in the TransPRK group (0 ± 0.20 D) was slightly lower compared with the Femto?LASIK group at 3 months (0.11 ± 0.25 D, P = 0.001). MR cylinder was ?0.06 ± 0.19 D in the TransPRK group and ?0.02 ± 0.15 D in the Femto?LASIK group at 3 months (P = 0.135). The index of success (IS) was 0.15 ± 0.36 in the TransPRK group and 0.06 ± 0.17 in the Femto?LASIK group (P = 0.125). The correction index (CI) was 1.03 ± 0.19 in the TransPRK group and 1.01 ± 0.11 in the Femto?LASIK group (P = 0.815). Conclusion: For low to moderate myopic astigmatism, TransPRK provided a comparable astigmatic treatment effect as Femto?LASIK. Myopic astigmatism was both slightly overcorrected after TransPRK and Femto?LASIK surgeries
ABSTRACT
Purpose: To evaluate the outcomes of transepithelial phototherapeutic keratectomy (transepithelial PTK) for treatment of posttraumatic recurrent corneal erosions. Methods: Twenty?four eyes of 22 patients with posttraumatic recurrent corneal erosions who were treated with transepithelial PTK from April 2018 to July 2020 were included in this retrospective study. The rates of recurrent erosions and complications were evaluated during the follow?up after surgery. Visual acuity and refraction were recorded preoperatively and 1 year after surgery. Total corneal astigmatism, total corneal irregular astigmatism, and total corneal spherical aberrations were recorded using corneal tomography preoperatively and 1 year after surgery. Results: Mean postoperative follow?up was 13 months (range: 12� months). None of the patients suffered from any complications or further erosions. Uncorrected distance visual acuity, best?corrected distance visual acuity, spherical equivalent, and cylinder remained stable at 1?year postoperatively compared with the baseline (P = 0.214, P = 0.461, P = 0.084, and P = 0.879, respectively). Moreover, there was no significant difference in total corneal astigmatism, total corneal irregular astigmatism, and total corneal spherical aberrations between baseline and 1?year postoperative visit (P = 0.938, P = 0.136, and P = 0.981, respectively). Conclusion: Transepithelial PTK was an effective treatment for patients with posttraumatic recurrent corneal erosions.