Two year results: sharp versus rounded optic edges on silicone lenses

J Cataract Refract Surg. 2000 Apr;26(4):566-70. doi: 10.1016/s0886-3350(00)00323-0.


To evaluate the role of optic edge design of 2 silicone intraocular lenses (IOLs) in 2 year clinical results. Department of Ophthalmology, University of Vienna, Medical School, Allgemeines Krankenhaus, Austria. In this comparative clinical study, 50 eyes had phacoemulsification and implantation of a high-refractive 3-piece silicone IOL with sharp optic edges (CeeOn model 911F) (n = 25) or a 3-piece silicone lens with rounded optic edges (CeeOn model 920) (n = 25). Biomicroscopic findings, including those of specular microscopic examination of the anterior lens surface, were documented and the results analyzed. After 2 years, a significant between-group difference in posterior capsule opacification (PCO) but not in anterior capsule alterations was observed. Behind all CeeOn 911F sharp-edge IOLs, the capsule remained clear; in 2 of 23 capsules behind the CeeOn 920 rounded-edge, a neodymium: YAG laser capsulotomy had to be performed for dense central fibrotic PCO. Seven of 21 of the remaining eyes had first-degree central fibrotic PCO, 14 of 23 had peripheral mixed fibrotic and slender Elschnig pearl PCO, and 8 of 23 had second-degree peripheral PCO. Specular microscopic findings did not differ between the 2 groups. No severe IOL decentration occurred in any eye; 25% in the sharp-edge group and 40% in the rounded-edge group had minimal decentration. The silicone IOL with the sharp optic edge design was associated with significantly reduced PCO 2 years postoperatively.

Publication types

  • Clinical Trial
  • Clinical Trial, Phase III
  • Comparative Study
  • Multicenter Study
  • Randomized Controlled Trial

MeSH terms

  • Aged
  • Aged, 80 and over
  • Biocompatible Materials
  • Cataract / etiology*
  • Cataract / pathology
  • Female
  • Follow-Up Studies
  • Humans
  • Laser Therapy
  • Lens Capsule, Crystalline / pathology*
  • Lens Capsule, Crystalline / surgery
  • Lens Implantation, Intraocular
  • Lenses, Intraocular / adverse effects*
  • Male
  • Middle Aged
  • Phacoemulsification
  • Prosthesis Design
  • Refraction, Ocular
  • Silicone Elastomers / adverse effects*
  • Treatment Outcome
  • Visual Acuity


  • Biocompatible Materials
  • Silicone Elastomers