Evaluation of porcine crystalline lenses in comparison with molded polymer gel lenses with an improved ex vivo accommodation simulator

Klaus Ehrmann, Arthur Ho, Jean Marie Parel

Research output: Contribution to journalConference article


The ex vivo accommodation simulator stretches crystalline lenses radially under controlled conditions, while monitoring the changes in zonular tension and lens diameter. A dual coaxial laser beam system was added for measuring changes in optical power as the lens is stretched. The EVAS instrument was fully characterized and calibrated. The results from 3 porcine eyes will be presented. Several crystalline lenses, similar in shape and size to porcine lenses, were cast molded in silicone gels of different stiffness. These lenses were evaluated using the EVAS instrument and custom made lens holding fixtures. With their well defined shape and material properties, results from these measurements will be useful for cross-validation of finite element models.

Original languageEnglish (US)
Article number40
Pages (from-to)240-251
Number of pages12
JournalProgress in Biomedical Optics and Imaging - Proceedings of SPIE
StatePublished - Jul 21 2005
EventOphtalmic Technologies XV - San Jose, CA, United States
Duration: Jan 22 2005Jan 25 2005



  • Accommodation simulation
  • Crystalline lens
  • Lens stretcher
  • Restoring accommodation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

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