title: Prediction of refractive error in combined vitrectomy and cataract surgery with one-piece acrylic intraocular lens.
abstract: OBJECTIVE
  To compare the predicted and actual refractive errors of hydrophilic, one-piece, C-flex 570C (C-flex) intraocular lens (IOL) implantation in simultaneous vitrectomy and lens extraction in various conditions.
  
  
  METHODS
  One hundred fifty-nine eyes of patients who had lens extraction between March 2004 and September 2005 were enrolled in a retrospective study. Group 1 had lens extraction and IOL implantation, and Group 2 had lens extraction and IOL implantation with vitrectomy. IOL calculation was done with axial length and keratometry measurements. The actual and predicted refractive errors were compared at 1 and 6 months postoperatively. The factors influencing the postoperative refractive outcomes were analyzed.
  
  
  RESULTS
  The mean refractive predictive error (i.e., the actual minus predicted spherical equivalent) was +0.19+/-0.39 D (Diopter) and -0.26+/-0.45 D at 1 and 6 months postoperatively (all: p<0.001) in group 1, and -0.22+/-0.39 D and -0.06+/-0.62 D at 1 and 6 months postoperatively (p=0.013, p=0.399 respectively). In group 2, all surgical factors related to refractive errors were not statistically significant (all: p>0.05).
  
  
  CONCLUSIONS
  Refractive errors in combined surgery showed myopic shift of -0.50 D and -0.32 D at 1 and 6 months postoperatively compared with C-flex IOL implantation alone. With the hyperopic tendency of IOL and myopic tendency of vitrectomy, the combined surgery made postoperative refractive errors near emmetropia.
authors.affiliation: Department of Ophthalmology, Soonchunhyang University College of Medicine, Seoul, Korea.
authors.forename: Dong Kyu
authors.initials: DK
authors.lastname: Lee
authors.forename: Sung Jin
authors.initials: SJ
authors.lastname: Lee
authors.forename: Yong Sung
authors.initials: YS
authors.lastname: You
mesh_terms: D000180:Acrylic Resins; D000368:Aged; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008875:Middle Aged; D018918:Phacoemulsification / Q000379:methods*; D012030:Refractive Errors / Q000175:diagnosis*; D012189:Retrospective Studies; D014821:Vitrectomy / Q000379:methods*
chemical_list: D000180:Acrylic Resins