title: Effect of intraocular lens optic edge design and material on fibrotic capsule opacification and capsulorhexis contraction.
abstract: OBJECTIVE
  To examine the influence of intraocular lens (IOL) optic edge design and optic material on fibrosis of the anterior and peripheral posterior capsules and on capsulorhexis contraction.
  
  
  METHODS
  Department of Ophthalmology, Medical University of Vienna, Vienna, Austria.
  
  
  METHODS
  This randomized controlled patient- and examiner-masked study comprised 210 eyes of 105 patients with bilateral age-related cataract. In Group 1 (n = 53), the Sensar OptiEdge AR40e hydrophobic acrylic IOL with a sharp posterior optic edge was compared with the AR40 acrylic IOL with a round edge. In Group 2 (n = 52), the ClariFlex OptiEdge silicone IOL with a sharp posterior optic edge was compared with the PhacoFlex SI-40 silicone IOL with a round edge All IOLs were manufactured by Advanced Medical Optics, Inc. Standardized digital slitlamp images of anterior capsule opacification (ACO) and fibrotic posterior capsule opacification (PCO) were taken 1 year postoperatively, and digital retroillumination images were taken at 1 week and 1 year. The intensity of fibrotic PCO was graded subjectively (score 0 to 4), ACO was graded objectively (score 0% to 100%), and the capsulorhexis area (mm(2)) was determined objectively.
  
  
  RESULTS
  One year after surgery, the mean ACO score was 32% in eyes with the sharp-edged acrylic IOL and 29% in eyes with the round-edged acrylic IOL (P<.05). In the silicone group, the mean was 31% and 26%, respectively (P<.05). The mean fibrotic PCO score was lower in eyes with a sharp-edged acrylic IOL than in eyes with a round-edged acrylic IOL (0.26 and 0.93, respectively; P<.05) and in eyes with a sharp-edged silicone IOL than in eyes with a round-edged silicone IOL (0.24 and 0.82, respectively; P<.001). At 1 year, the mean capsulorhexis area was statistically significantly smaller in eyes with a sharp-edged silicone IOL than in eyes with a round-edged silicone IOL (P<.05).
  
  
  CONCLUSIONS
  Acrylic and silicone IOLs with the sharp OptiEdge design led to significantly less fibrotic PCO but more ACO than round-edged acrylic and silicone IOLs. The sharp-edged silicone IOL caused significantly more capsulorhexis contraction than the round-edged silicone IOL and both acrylic IOLs.
authors.affiliation: Department of Ophthalmology, Medical University of Vienna, A-1090 Vienna, Austria. rupert.menapace@univie.ac.at
authors.forename: Stefan
authors.initials: S
authors.lastname: Sacu
authors.forename: Rupert
authors.initials: R
authors.lastname: Menapace
authors.forename: Wolf
authors.initials: W
authors.lastname: Buehl
authors.forename: Georg
authors.initials: G
authors.lastname: Rainer
authors.forename: Oliver
authors.initials: O
authors.lastname: Findl
mesh_terms: D000180:Acrylic Resins; D000368:Aged; D001672:Biocompatible Materials; D019923:Capsulorhexis / Q000009:adverse effects; D002386:Cataract / Q000209:etiology* / Q000517:prevention & control; D003286:Contracture / Q000209:etiology* / Q000517:prevention & control; D004311:Double-Blind Method; D005355:Fibrosis; D006801:Humans; D007903:Lens Capsule, Crystalline / Q000473:pathology*; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D018918:Phacoemulsification; D011183:Postoperative Complications; D011446:Prospective Studies; D011474:Prosthesis Design; D012826:Silicone Elastomers
chemical_list: D000180:Acrylic Resins; D001672:Biocompatible Materials; D012826:Silicone Elastomers