title: Excimer Laser Versus Phakic Intraocular Lenses for Myopia and Astigmatism: A Meta-Analysis of Randomized Controlled Trials.
abstract: OBJECTIVE
  Meta-analysis of randomized controlled trials (RCTs) which compared excimer laser refractive surgery and phakic intraocular lenses (PIOLs) for the treatment of myopia and astigmatism.
  
  
  METHODS
  An electronic literature search was performed using the PubMed, EBSCO, CNKI, and Cochrane Library database to identify prospective RCTs which compared excimer laser refractive surgery and PIOL with a follow-up time of at least 12 months. Efficacy, accuracy, safety outcomes, and complications were analyzed by standardized mean difference, risk ratio, and the pooled estimates according to a fixed effect model or random effect model.
  
  
  RESULTS
  This review included 5 RCTs with a sum of 405 eyes. The range of myopia was 6.0 to 20.0 D with up to 4.0 D of astigmatism. The PIOL group was more likely to achieve a spherical equivalence within±1.0 D of target refraction at 12 months postoperatively (P=0.009), and was less likely to lose one or more lines of best spectacle corrected visual acuity than the LASER group (P=0.002). On the whole, there is no significant difference in efficacy and complications between the two kinds of surgeries.
  
  
  CONCLUSIONS
  This meta-analysis indicated that PIOLs were safer and more accurate within 12 months of follow-up compared with excimer laser surgical for refractive errors.
authors.affiliation: Department of Ophthalmology (C.H., L.Y., N.G.), Cangzhou Central Hospital, Cangzhou, China; and Department of Ophthalmology (C.H., J.M.), Second Hospital of Hebei Medical University, Shijiazhuang, China.
authors.forename: Haiting
authors.initials: H
authors.lastname: Chen
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Guangzeng
authors.initials: G
authors.lastname: Niu
authors.forename: Jingxue
authors.initials: J
authors.lastname: Ma
mesh_terms: D001251:Astigmatism / Q000601:surgery*; D006801:Humans; D054018:Lasers, Excimer / Q000009:adverse effects / Q000627:therapeutic use*; D009216:Myopia / Q000601:surgery*; D054120:Phakic Intraocular Lenses / Q000009:adverse effects; D016032:Randomized Controlled Trials as Topic; D014792:Visual Acuity