Modelling the performance of accommodating intraocular lenses

A. Ho, F. Manns, T. Pham, S. Evans, J. M. Parel

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

Pseudo-accommodating intra-ocular lenses (P-IOL) have been available for some time and the availability of accommodating IOL (A-IOL) is imminent. While these types of devices have been tested empirically, few studies have addressed the fundamental parameters governing their performance limits. We modelled the amplitude of accommodation of A-IOLs and P-IOLs to analyse parameters controlling their performance. Methods. Two types of two-element A-IOLs (those with a mobile anterior optical element, or a mobile posterior element) were modelled. Paraxial models were developed to identify key controlling parameters and potential optimal configurations, followed by finite modelling using computer assisted ray-tracing employing equi-convex/concave optical elements. A range of configurations representing varying focal lengths of front and back optical elements were tested. Degenerate cases representing P-IOLs were also tested. Results. P-IOLs have limited rate of pseudo-accommodation with axial shift (approximately 1.2D/mm). For A-IOLs, configurations with positive power front elements returned best rate of accommodation (up to approximately 3.0D/mm when the front element focal length is 25 mm). Conclusions. Considering the maximum potential amounts of axial shifts available, P-IOLs were predicted to provide less than ID of accommodation whereas A-IOLs may provide up to 3-4D of accommodation, depending on design configuration.

Original languageEnglish (US)
Article number5314-12
Pages (from-to)36-47
Number of pages12
JournalProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume5
Issue number3
DOIs
StatePublished - Dec 1 2004
EventOphthalmic Technologies XIV - San Jose, CA, United States
Duration: Jan 24 2004Jan 27 2004

Keywords

  • Accommodation
  • Intraocular lens
  • Modelling
  • Pseudo-accommodation
  • Ray-tracing

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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