title: [Multifactor analysis of the reasons causing undercorrection after laser in situ keratomileusis].
abstract: OBJECTIVE
  To investigate the relationship between various factors and the undercorrection after laser in situ keratomileusis (LASIK).
  
  
  METHODS
  Of 1 391 eyes (696 cases), the undercorrection eyes grouped by left or right eye were analyzed by Chi-square test and logistic regression analysis based on age, sex, occupation, address, family history of myopia and all ophthalmologic examination results before and after LASIK.
  
  
  RESULTS
  The results of logistic regression analysis showed that the undercorrection after LASIK of both groups was related to four factors: the duration of myopia (left eye OR = 1.076, 95% CI: 1.030 - 1.124; right eye OR = 1.093, 95% CI: 1.046 - 1.142), preoperative refractive power (left eye OR = 7.799, 95% CI: 1.755 - 34.654; right eye OR = 28.823, 95% CI: 5.750 - 144.467), preoperative best corrected vision (left eye OR = 0.000, 95% CI: 0.000 - 0.262; right eye OR = 0.000, 95% CI: 0.000 - 0.144) and the corneal thickness (left eye OR = 0.976, 95% CI: 0.965 - 0.987; right eye OR = 0.975, 95% CI: 0.964 - 0.986).
  
  
  CONCLUSIONS
  Longer duration of myopia and the more refractive power seemed to be the risk factors, while the better corrected vision and the thicker thickness of cornea the protect factors of undercorrection after LASIK.
authors.affiliation: Department of Ophthalmology, the First Affiliated Hospital of China Medical University, Shenyang 110001, China.
authors.forename: Han-qiang
authors.initials: HQ
authors.lastname: Liu
authors.forename: Jing-pu
authors.initials: JP
authors.lastname: Shi
authors.forename: Chang-rong
authors.initials: CR
authors.lastname: Ma
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.forename: Xiao-li
authors.initials: XL
authors.lastname: Ma
authors.forename: Ying
authors.initials: Y
authors.lastname: Jin
authors.forename: Xue-hai
authors.initials: XH
authors.lastname: Jin
authors.forename: Hai-long
authors.initials: HL
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000706:statistics & numerical data; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009216:Myopia / Q000453:epidemiology / Q000601:surgery*; D012307:Risk Factors; D017211:Treatment Failure; D014792:Visual Acuity