Mechanical properties of intra-ocular lenses

Klaus Ehrmann, Eon Kim, Jean-Marie A Parel

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Cataract surgery usually involves the replacement of the natural crystalline lens with a rigid or foldable intra-ocular lens to restore clear vision for the patient. While great efforts have been placed on optimising the shape and optical characteristics of IOLs, little is know about the mechanical properties of these devices and how they interact with the capsular bag once implanted. Mechanical properties measurements were performed on 8 of the most commonly implanted IOLs using a custom build micro tensometer. Measurement data will be presented for the stiffness of the haptic elements, the buckling resistance of foldable IOLs, the dynamic behaviour of the different lens materials and the axial compressibility. The biggest difference between the lens types was found between one-piece and 3-piece lenses with respect to the flexibility of the haptic elements.

Original languageEnglish
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
StatePublished - May 26 2008
EventOphthalmic Technologies XVIII - San Jose, CA, United States
Duration: Jan 19 2008Jan 21 2008


OtherOphthalmic Technologies XVIII
CountryUnited States
CitySan Jose, CA



  • Capsular bag
  • Haptic pressure
  • Intra-ocular lens
  • Lens foldability

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Ehrmann, K., Kim, E., & Parel, J-M. A. (2008). Mechanical properties of intra-ocular lenses. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE (Vol. 6844). [68440O]