title: Changes in wave-front aberrations after rigid gas permeable contact lens fitting in post-laser in situ keratomileusis patients with visual complaints.
abstract: OBJECTIVE
  To evaluate the effect of rigid gas permeable (RGP) contact lenses in reducing wave-front aberrations in post-laser in situ keratomileusis (LASIK) myopic patients.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  Thirty patients with visual complaints after conventional LASIK procedure for correcting myopia.
  
  
  METHODS
  The 30 patients were fitted with RGP contact lenses. Wave-front measurements were taken before and after RGP contact lens wearing.
  
  
  RESULTS
  Compared with bare eye examinations, root mean-square values of higher-order aberrations (HOAs) significantly decreased with RGP contact lens use. Among these, spherical aberration decreased from 0.507 (SD 0.304) microm to 0.164 (SD 0.121) microm (t = 7.186, p < 0.001); coma decreased from 0.470 (SD 0.312) microm to 0.165 (SD 0.090) microm (t = 5.566, p < 0.001); secondary coma decreased from 0.079 (SD 0.050) microm to 0.044 (SD 0.027) m (t = 4.118, p < 0.001); and total HOAs decreased from 0.782 (SD 0.449) microm to 0.307 (SD 0.140) microm (t = 6.710, p < 0.001).
  
  
  CONCLUSIONS
  Fitting RGP contact lenses effectively decreased HOAs induced by conventional myopic LASIK surgery. Possible reasons may be the elimination of irregularity and dissymmetry on the corneal anterior surface, relief of the aspherical extent of the central corneal surface, and enlargement of the effective optical zone.
authors.affiliation: Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China.
authors.forename: Gan
authors.initials: G
authors.lastname: Tan
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.forename: Xiaolian
authors.initials: X
authors.lastname: Chen
authors.forename: Hong
authors.initials: H
authors.lastname: He
authors.forename: Xingwu
authors.initials: X
authors.lastname: Zhong
mesh_terms: D057128:Aberrometry; D000293:Adolescent; D000328:Adult; D003261:Contact Lenses; D057108:Corneal Wavefront Aberration / Q000209:etiology / Q000628:therapy*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D020731:Keratomileusis, Laser In Situ; D008297:Male; D009216:Myopia / Q000601:surgery*; D011183:Postoperative Complications; D017755:Prosthesis Fitting; D014786:Vision Disorders / Q000209:etiology / Q000628:therapy*; D055815:Young Adult