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Proceedings Paper

Modelling the performance of accommodating intraocular lenses
Author(s): Arthur Ho; Fabrice Manns; Therese Pham; Simon Evans; Jean-Marie Parel
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Paper Abstract

Purpose. 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 1D of accommodation whereas A-IOLs may provide up to 3-4D of accommodation, depending on design configuration.

Paper Details

Date Published: 13 July 2004
PDF: 12 pages
Proc. SPIE 5314, Ophthalmic Technologies XIV, (13 July 2004); doi: 10.1117/12.540879
Show Author Affiliations
Arthur Ho, Vision Cooperative Research Ctr. (Australia)
CCLRU, Univ. of New South Wales (Australia)
Fabrice Manns, Univ. of Miami School of Medicine (United States)
Univ. of Miami (United States)
Therese Pham, Vision Cooperative Research Ctr. (Australia)
Simon Evans, Vision Cooperative Research Ctr. (Australia)
Jean-Marie Parel, Univ. of Miami School of Medicine (United States)
Univ. of Liege, CHU Sart-Tilman (Belgium)

Published in SPIE Proceedings Vol. 5314:
Ophthalmic Technologies XIV
Fabrice Manns; Per G. Soderberg; Arthur Ho, Editor(s)

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