title: Effect of trabeculectomy on the accuracy of intraocular lens calculations in patients with open-angle glaucoma.
abstract: BACKGROUND
  The objective of the study is to examine the effect of trabeculectomy on intraocular lens power calculations in patients with open-angle glaucoma (OAG) undergoing cataract surgery.
  
  
  METHODS
  The design is retrospective data analysis.
  
  
  METHODS
  There are a total of 55 eyes of 55 patients with OAG who had a cataract surgery alone or in combination with trabeculectomy.
  
  
  METHODS
  We classified OAG subjects into the following groups based on surgical history: only cataract surgery (OC group), cataract surgery after prior trabeculectomy (CAT group), and cataract surgery performed in combination with trabeculectomy (CCT group).
  
  
  METHODS
  Differences between actual and predicted postoperative refractive error.
  
  
  RESULTS
  Mean error (ME, difference between postoperative and predicted SE) in the CCT group was significantly lower (towards myopia) than that of the OC group (P = 0.008). Additionally, mean absolute error (MAE, absolute value of ME) in the CAT group was significantly greater than in the OC group (P = 0.006). Using linear mixed models, the ME calculated with the SRK II formula was more accurate than the ME predicted by the SRK T formula in the CAT (P = 0.032) and CCT (P = 0.035) groups.
  
  
  CONCLUSIONS
  The intraocular lens power prediction accuracy was lower in the CAT and CCT groups than in the OC group. The prediction error was greater in the CAT group than in the OC group, and the direction of the prediction error tended to be towards myopia in the CCT group. The SRK II formula may be more accurate in predicting residual refractive error in the CAT and CCT groups.
authors.affiliation: Department of Ophthalmology, Severance Hospital, Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Hyoung Won
authors.initials: HW
authors.lastname: Bae
authors.affiliation: Department of Ophthalmology, Severance Hospital, Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Yun Ha
authors.initials: YH
authors.lastname: Lee
authors.affiliation: Department of Ophthalmology, Severance Hospital, Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Do Wook
authors.initials: do W
authors.lastname: Kim
authors.affiliation: Department of Ophthalmology, Severance Hospital, Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Taekjune
authors.initials: T
authors.lastname: Lee
authors.affiliation: Department of Ophthalmology, Severance Hospital, Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Samin
authors.initials: S
authors.lastname: Hong
authors.affiliation: Department of Ophthalmology, Severance Hospital, Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Gong Je
authors.initials: GJ
authors.lastname: Seong
authors.affiliation: Department of Ophthalmology, Severance Hospital, Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Chan Yun
authors.initials: CY
authors.lastname: Kim
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D058452:Axial Length, Eye / Q000033:anatomy & histology; D001699:Biometry; D005260:Female; D005902:Glaucoma, Open-Angle / Q000601:surgery*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D055095:Optics and Photonics / Q000592:standards*; D018918:Phacoemulsification; D011183:Postoperative Complications; D012030:Refractive Errors / Q000175:diagnosis; D015203:Reproducibility of Results; D012189:Retrospective Studies; D014130:Trabeculectomy; D014792:Visual Acuity / Q000502:physiology
keywords: cataract surgery; combined surgery; open-angle glaucoma; power prediction; trabeculectomy