title: Uveal and capsular biocompatibility of a single-piece, sharp-edged hydrophilic acrylic intraocular lens with collagen (Collamer): 1-year results.
abstract: OBJECTIVE
  To analyze uveal and capsular biocompatibility 1 year following implantation of a sharp-edged, hydrophilic, collagen-containing posterior chamber intraocular lens (IOL).
  
  
  METHODS
  Department of Ophthalmology, University of Vienna Medical School, Vienna, Austria.
  
  
  METHODS
  In a prospective study, a Collamer CC4204BF IOL was implanted in 30 eyes of patients with senile cataract. A standardized surgical technique and postoperative regimen were applied. To assess uveal biocompatibility, cellular inflammation on the anterior IOL surface was evaluated with a specular microscope. Capsular biocompatibility was registered semiquantitatively with a biomicroscope, based on an assessment of fibrosis on the anterior and posterior capsules. Tyndall values were measured with the Kowa FC-1000 laser flare-cell meter. Decentration of the lens was also registered.
  
  
  RESULTS
  One year after implantation, the values of flare and cell count in the anterior chamber were lower than preoperatively. Round and spindle-shaped, epithelioid, and foreign-body giant cells were not found on the anterior surface of the IOL. The capsulorhexis rim was moderately fibrosed in 56.6% of cases. Fibrosis of the capsule over the optic was also moderate in 36.6%. The central portion of the posterior capsule was devoid of fibrosis in 43.3% and mildly fibrosed in 50%. Three lenses revealed outgrowth of lens epithelial cells to the anterior surface of the IOL. A neodymium:YAG capsulotomy had to be performed in 1 case. All lenses were well centered in the capsular bag 1 year after implantation.
  
  
  CONCLUSIONS
  The absence of inflammatory cells on the anterior surface of the IOL indicates the high uveal biocompatibility of the lens. In terms of capsular biocompatibility, the results were satisfactory.
authors.affiliation: Department of Ophthalmology, University of Vienna, Medical School, Vienna, Austria.
authors.forename: Gebtraud
authors.initials: G
authors.lastname: Schild
authors.forename: Michael
authors.initials: M
authors.lastname: Amon
authors.forename: Claudette
authors.initials: C
authors.lastname: Abela-Formanek
authors.forename: Jörg
authors.initials: J
authors.lastname: Schauersberger
authors.forename: Gustav
authors.initials: G
authors.lastname: Bartl
authors.forename: Andreas
authors.initials: A
authors.lastname: Kruger
mesh_terms: D001672:Biocompatible Materials; D002452:Cell Count; D003094:Collagen; D005260:Female; D005355:Fibrosis; D005549:Foreign-Body Reaction / Q000517:prevention & control; D015726:Giant Cells / Q000473:pathology; D006801:Humans; D007903:Lens Capsule, Crystalline / Q000473:pathology*; D007905:Lens Diseases / Q000517:prevention & control*; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D018918:Phacoemulsification; D011102:Polyhydroxyethyl Methacrylate; D011446:Prospective Studies; D011474:Prosthesis Design; D014603:Uveal Diseases / Q000517:prevention & control*
chemical_list: D001672:Biocompatible Materials; D011102:Polyhydroxyethyl Methacrylate; D003094:Collagen