title: Correlations between Preoperative Angle Parameters and Postoperative Unpredicted Refractive Errors after Cataract Surgery in Open Angle Glaucoma (AOD 500).
abstract: OBJECTIVE
  To assess the accuracy of intraocular lens (IOL) power prediction for cataract surgery with open angle glaucoma (OAG) and to identify preoperative angle parameters correlated with postoperative unpredicted refractive errors.
  
  
  METHODS
  This study comprised 45 eyes from 45 OAG subjects and 63 eyes from 63 non-glaucomatous cataract subjects (controls). We investigated differences in preoperative predicted refractive errors and postoperative refractive errors for each group. Preoperative predicted refractive errors were obtained by biometry (IOL-master) and compared to postoperative refractive errors measured by auto-refractometer 2 months postoperatively. Anterior angle parameters were determined using swept source optical coherence tomography. We investigated correlations between preoperative angle parameters [angle open distance (AOD); trabecular iris surface area (TISA); angle recess area (ARA); trabecular iris angle (TIA)] and postoperative unpredicted refractive errors.
  
  
  RESULTS
  In patients with OAG, significant differences were noted between preoperative predicted and postoperative real refractive errors, with more myopia than predicted. No significant differences were recorded in controls. Angle parameters (AOD, ARA, TISA, and TIA) at the superior and inferior quadrant were significantly correlated with differences between predicted and postoperative refractive errors in OAG patients (-0.321 to -0.408, p<0.05). Superior quadrant AOD 500 was significantly correlated with postoperative refractive differences in multivariate linear regression analysis (β=-2.925, R²=0.404).
  
  
  CONCLUSIONS
  Clinically unpredicted refractive errors after cataract surgery were more common in OAG than in controls. Certain preoperative angle parameters, especially AOD 500 at the superior quadrant, were significantly correlated with these unpredicted errors.
authors.affiliation: Department of Ophthalmology, International St. Mary's Hospital, Catholic Kwandong University College of Medicine, Incheon, Korea.
authors.forename: Wonseok
authors.initials: W
authors.lastname: Lee
authors.affiliation: Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Hyoung Won
authors.initials: HW
authors.lastname: Bae
authors.affiliation: Department of Ophthalmology, Eulji University Hospital, Daejeon, Korea.
authors.forename: Si Hyung
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Chan Yun
authors.initials: CY
authors.lastname: Kim
authors.affiliation: Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea. gjseong@yuhs.ac.
authors.forename: Gong Je
authors.initials: GJ
authors.lastname: Seong
mesh_terms: D000368:Aged; D001699:Biometry; D002387:Cataract Extraction; D005260:Female; D005902:Glaucoma, Open-Angle / Q000150:complications*; D006801:Humans; D007498:Iris; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008875:Middle Aged; D009216:Myopia / Q000175:diagnosis / Q000209:etiology; D011184:Postoperative Period; D012030:Refractive Errors / Q000175:diagnosis / Q000209:etiology*; D041623:Tomography, Optical Coherence / Q000379:methods; D014787:Vision Tests
keywords: Open angle glaucoma; angle parameters; cataract surgery; postoperative refractive error