title: 3-Year follow-up after Lasik: assessing the risk factors for retreatment.
abstract: The purpose of this study was to evaluate the correlation of important risk factors for LASIK retreatment and the retreatment rate. A retrospective cohort study was conducted. Records of patients who underwent LASIK between January 2011 and January 2012 at the Zambrano-Hellion Medical Center, Tec de Monterrey (México), and posteriorly underwent LASIK retreatment were identified and risk factors to receive retreatment were assessed using relative risk. Main outcomes were retreatment rate, risk factors for retreatment, and uncorrected distance visual acuity (UDVA). 482 eyes from 241 patients were available for a 36-month follow-up analysis. 68.5 % had primary myopic LASIK; 37 % were ≤ 2 diopters (D), 52 % were > 2 and < 6 D, and 11 % were ≥ 6 D of myopia. 31.5 % of the eyes had hyperopic LASIK. Retreatment was performed in 6.85 % eyes. Myopia > 6 D (RR 4.13), hyperopic refraction (RR 3.18), and age > 40 (RR 3.07) were the most important risk factors for retreatment (P = 0.004, P = 0.007, P = 0.006, respectively). UDVA was ≥ 20/40 in 92.1 % and ≥ 20/20 in 81.6 % of the retreated eyes and 82 % of the eyes within ± 0.50 D of target refraction. Increasing degrees of myopia, followed by hyperopic refraction, and age were the most important associated factors to retreatment. LASIK retreatment was safe and effective.
authors.affiliation: Service of Cornea and Refractive Surgery, Ophthalmology and Visual Sciences Institute, School of Medicine of the Tecnologico de Monterrey, Morones Prieto 3000 Pte., Los Doctores, 64710, Monterrey, Nuevo Leon, Mexico. jorge.valdez@itesm.mx.
authors.forename: Jorge E
authors.initials: JE
authors.lastname: Valdez-García
authors.affiliation: Service of Cornea and Refractive Surgery, Ophthalmology and Visual Sciences Institute, School of Medicine of the Tecnologico de Monterrey, Morones Prieto 3000 Pte., Los Doctores, 64710, Monterrey, Nuevo Leon, Mexico.
authors.forename: Julio C
authors.initials: JC
authors.lastname: Hernandez-Camarena
authors.affiliation: School of Medicine of the Tecnologico de Monterrey, Monterrey, Mexico.
authors.forename: Rosa
authors.initials: R
authors.lastname: Martínez-Muñoz
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006956:Hyperopia / Q000503:physiopathology / Q000601:surgery*; D020731:Keratomileusis, Laser In Situ; D008297:Male; D008800:Mexico; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D012029:Refraction, Ocular / Q000502:physiology; D012086:Reoperation / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D012307:Risk Factors; D014792:Visual Acuity / Q000502:physiology; D055815:Young Adult
keywords: LASIK; LASIK retreatment; Refractive surgery; Risk factors