title: Capsular bending ring to prevent posterior capsule opacification: 2 year follow-up.
abstract: OBJECTIVE
  To evaluate the preventive effect of a capsular bending ring on anterior and posterior capsule (PCO) opacification in a 2 year clinical study.
  
  
  METHODS
  Jinshikai Medical Foundation, Nishi Eye Hospital, Osaka, Japan.
  
  
  METHODS
  This study comprised 60 patients with senile cataract (35 women, 25 men) with a mean age of 69 years. An open poly(methyl methacrylate) capsular bending ring with a truncated edge profile designed to create a sharp bend in the equatorial capsule was implanted in 1 eye of patients with a hydroxyethyl methacrylate intraocular lens (IOL). The contralateral eye, which acted as a control, received an IOL but no ring. Patients were examined 6 months (n = 52), 1 year (n = 48), and 2 years (n = 42) postoperatively. Anterior capsule opacification was determined by slitlamp evaluation. Anterior capsule shrinkage (area within the capsulorhexis) and PCO were evaluated and scored using a computer software package for image analysis. Posterior capsule opacification was also measured by the rate of neodymium:YAG (Nd:YAG) capsulotomies.
  
  
  RESULTS
  Anterior capsule opacification and shrinkage were significantly less in eyes with the ring. The mean PCO score was 0.235 +/- 0.215 (SD), 0.287 +/- 0.200, and 0.398 +/- 0.248 with the ring and 0.530 +/- 0.190, 0.670 +/- 0.225, and 1.111 +/- 0.298 without the ring at 6 months, 1 year, and 2 years, respectively (P <.01 at each follow-up). An Nd:YAG laser capsulotomy was performed in 4 eyes with and 17 eyes without the ring after 2 years (P <.01).
  
  
  CONCLUSIONS
  The capsular bending ring significantly reduced anterior capsule fibrosis and shrinkage as well as PCO. The ring may be useful in patients who are at high risk of developing eye complications from capsule opacification that require Nd:YAG laser capsulotomy, in those expected to have vitreoretinal surgery and photocoagulation, and in cases of pediatric cataract.
authors.affiliation: Nishi Eye Hospital, Osaka, Japan. okihiro@nishi-ganka.or.jp
authors.forename: O
authors.initials: O
authors.lastname: Nishi
authors.forename: K
authors.initials: K
authors.lastname: Nishi
authors.forename: R
authors.initials: R
authors.lastname: Menapace
authors.forename: J
authors.initials: J
authors.lastname: Akura
mesh_terms: D000368:Aged; D019923:Capsulorhexis / Q000379:methods; D002386:Cataract / Q000517:prevention & control*; D005260:Female; D005355:Fibrosis / Q000517:prevention & control; D005500:Follow-Up Studies; D006801:Humans; D007903:Lens Capsule, Crystalline / Q000473:pathology / Q000601:surgery*; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification / Q000379:methods; D019904:Polymethyl Methacrylate; D011183:Postoperative Complications / Q000517:prevention & control*; D019736:Prostheses and Implants; D019919:Prosthesis Implantation; D014792:Visual Acuity
chemical_list: D019904:Polymethyl Methacrylate