title: [Radial keratotomy: can we predict results?].
abstract: OBJECTIVE
  Results after keratotomy may be less than satisfactory. Based on different parameters, we performed statistical efficiency tests in order to improve criteria for good and poor prognosis for the first procedure.
  
  
  METHODS
  This study used the registries of 155 surgical procedures performed by the same team. Data collected from patient records included degree of myopia, preoperative keratometry, close preoperative pachymetry and postoperative visual acuity. Preoperative factors predicting poor postoperative visual acuity in this population were screened with several statistical tests: one simple test, one two-way (linear or barycentric) test and one principal component factorial test using visual analysis.
  
  
  RESULTS
  Prognosis was very different depending on whether myopia was greater than or less than 3.25 diopters. The visual analysis method gave maps capable of screening for prognosis. Results mapping is a new approach.
  
  
  CONCLUSIONS
  Chance of success is greatest in less myopic eyes (< 3.25 diopters) with low keratometry (< 43.5 diopters). Other eyes should not be operated. Easy-to-use maps were obtained and provided hetero unreached prognostic precision. Nevertheless, because of population composition, none of the methods could identify perfectly satisfactory prognosis criteria.
authors.affiliation: CHRU Lille (Lille 2), Service d'Ophtalmologie.
authors.forename: P
authors.initials: P
authors.lastname: Steen
authors.forename: J F
authors.initials: JF
authors.lastname: Rouland
authors.forename: J J
authors.initials: JJ
authors.lastname: Denimal
mesh_terms: D006801:Humans; D007646:Keratotomy, Radial; D009216:Myopia / Q000601:surgery*; D011184:Postoperative Period; D011237:Predictive Value of Tests; D011379:Prognosis; D012042:Registries; D012680:Sensitivity and Specificity
vernacular_title: Kératotomie radiaire: peut-on prévoir les résultats?