Optical resolution of silicone and polymethylmethacrylate intraocular lenses

J Cataract Refract Surg. 1987 Nov;13(6):635-9. doi: 10.1016/s0886-3350(87)80153-0.


The optical resolution and contrast of 18 silicone and 18 polymethylmethacrylate (PMMA) intraocular lenses were determined before implantation in and after removal from rabbit eyes. A specially designed microphotographic system that allows documentation and comparison of the image quality of different lens types was used. Silicone intraocular lenses showed a mean axial resolution of 1.25, PMMA lenses showed 1.60, of an optotype analogous resolution target (1.0 = 20/20) at a 3 mm pupil opening preoperatively. At one to 16 weeks postoperatively, both types of IOLs demonstrated nearly unchanged resolution. Contrast, however, decreased to between 60% and 85% of the preoperative 100% standard. This decrease was due to precipitates deposited on the lens surface, to posterior capsule opacification, and to lens decentration.

Publication types

  • Comparative Study

MeSH terms

  • Animals
  • Lenses, Intraocular*
  • Methylmethacrylates*
  • Microscopy, Electron, Scanning
  • Models, Anatomic
  • Optics and Photonics*
  • Prosthesis Design
  • Rabbits
  • Silicones*
  • Visual Acuity


  • Methylmethacrylates
  • Silicones