title: Capsule measuring ring to predict capsular bag diameter and follow its course after foldable intraocular lens implantation.
abstract: OBJECTIVE
  To evaluate the extent of capsular bag shrinkage after cataract surgery with intraocular lens (IOL) implantation and develop a regression formula to predict postoperative capsular bag size.
  
  
  METHODS
  Eye Hospital, Johannes Gutenberg-University, Mainz, Germany.
  
  
  METHODS
  The axial length (AL), anterior chamber depth, and corneal radius in 58 eyes were measured preoperatively. Cataract surgery was by phacoemulsification followed by implantation of a 3-piece, acrylic, posterior chamber IOL. The capsular bag diameter and anterior capsulorhexis were measured intraoperatively and 1 day and 1, 3, and 6 months postoperatively using a Koch capsule measuring ring (HumanOptics).
  
  
  RESULTS
  The mean capsular bag size was 10.53 mm intraoperatively, 10.31 mm at 1 day, 9.62 mm at 1 month, 9.07 mm at 3 months, and 9.01 mm at 6 months. The mean capsular bag shrinkage over the entire postoperative period was 14.8% (P<.001). Of the parameters studied, only AL had a positive correlation with capsule shrinkage. The correlation was moderate but statistically significant (P =.001).
  
  
  CONCLUSIONS
  A correlation was found between capsular bag shrinkage and AL. Using preoperative biometric data, a regression formula of moderate validity was determined to predict capsular bag shrinkage.
authors.affiliation: Department of Ophthalmology, Johannes Gutenberg-University, Mainz, Germany. tehrani@augen.klinik.uni-mainz.de
authors.forename: Mana
authors.initials: M
authors.lastname: Tehrani
authors.forename: H Burkhard
authors.initials: HB
authors.lastname: Dick
authors.forename: Frank
authors.initials: F
authors.lastname: Krummenauer
authors.forename: Gudrun
authors.initials: G
authors.lastname: Pfirrmann
authors.forename: Thomas
authors.initials: T
authors.lastname: Boyle
authors.forename: Bernhard M
authors.initials: BM
authors.lastname: Stoffelns
mesh_terms: D000180:Acrylic Resins; D019923:Capsulorhexis / Q000295:instrumentation; D003315:Cornea / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D007903:Lens Capsule, Crystalline / Q000473:pathology*; D019654:Lens Implantation, Intraocular / Q000009:adverse effects* / Q000295:instrumentation; D007910:Lenses, Intraocular; D008297:Male; D018918:Phacoemulsification; D011183:Postoperative Complications
chemical_list: D000180:Acrylic Resins