title: Clinical Outcomes of an Optimized Prolate Ablation Procedure for Correcting Residual Refractive Errors Following Laser Surgery.
abstract: OBJECTIVE
  The purpose of this study was to investigate the clinical efficacy of an optimized prolate ablation procedure for correcting residual refractive errors following laser surgery.
  
  
  METHODS
  We analyzed 24 eyes of 15 patients who underwent an optimized prolate ablation procedure for the correction of residual refractive errors following laserin situkeratomileusis, laser-assisted subepithelial keratectomy, or photorefractive keratectomy surgeries. Preoperative ophthalmic examinations were performed, and uncorrected distance visual acuity, corrected distance visual acuity, manifest refraction values (sphere, cylinder, and spherical equivalent), point spread function, modulation transfer function, corneal asphericity (Q value), ocular aberrations, and corneal haze measurements were obtained postoperatively at 1, 3, and 6 months.
  
  
  RESULTS
  Uncorrected distance visual acuity improved and refractive errors decreased significantly at 1, 3, and 6 months postoperatively. Total coma aberration increased at 3 and 6 months postoperatively, while changes in all other aberrations were not statistically significant. Similarly, no significant changes in point spread function were detected, but modulation transfer function increased significantly at the postoperative time points measured.
  
  
  CONCLUSIONS
  The optimized prolate ablation procedure was effective in terms of improving visual acuity and objective visual performance for the correction of persistent refractive errors following laser surgery.
authors.affiliation: The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Byunghoon
authors.initials: B
authors.lastname: Chung
authors.affiliation: The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Hun
authors.initials: H
authors.lastname: Lee
authors.affiliation: Lee Eye Clinic, Busan, Korea.
authors.forename: Bong Joon
authors.initials: BJ
authors.lastname: Choi
authors.affiliation: The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Kyung Ryul
authors.initials: KR
authors.lastname: Seo
authors.affiliation: The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.; Corneal Dystrophy Research Institute, Severance Biomedical Science Institute, and Brain Korea 21 Project for Medical Science, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Eung Kwon
authors.initials: EK
authors.lastname: Kim
authors.affiliation: Lee Eye Clinic, Busan, Korea.
authors.forename: Dae Yune
authors.initials: DY
authors.lastname: Kim
authors.affiliation: The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Tae-Im
authors.initials: TI
authors.lastname: Kim
mesh_terms: D000328:Adult; D003315:Cornea / Q000473:pathology / Q000601:surgery*; D019781:Corneal Topography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D049008:Keratectomy, Subepithelial, Laser-Assisted / Q000379:methods*; D020731:Keratomileusis, Laser In Situ / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D012029:Refraction, Ocular; D012086:Reoperation; D012189:Retrospective Studies; D013997:Time Factors; D014792:Visual Acuity
keywords: Optimized prolate ablation; Refractive surgery; Residual refractive errors