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Proceedings Paper

Experimental characterization of the imaging properties of multifocal intraocular lenses
Author(s): Pier Giorgio Gobbi; Francesco Fasce; Stefano Bozza; Rosario Brancato
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Paper Abstract

Many different types of intraocular lenses (IOL) are currently available for implantation, both as crystalline lens replacements and as phakic refractive elements. Their optical design is increasingly sophisticated, including aspherical surface profiles and multi-zone multifocal structures, however a quantitative and comparative characterization of their imaging properties is lacking. Also a qualitative visualization of their properties would be very useful for patients in the lens choice process. To this end an experimental eye model has been developed to allow for simulated in-vivo testing of IOLs. The model cornea is made of PMMA with a dioptric power of 43 D, and it has an aspherical profile designed to minimize spherical aberration across the visible spectrum. The eye model has a variable iris and a mechanical support to accomodate IOLs, immersed in physiological solution. The eye length is variable and the retina is replaced by a glass plate. The image formed on this "retina" is optically conjugated to a CCD camera, with a suitable magnification in order to mimic the human fovea resolution, and displayed onto a monitor. With such an opto-mechanical eye model, two types of images have been used to characterize IOLs: letter charts and variable contrast gratings, in order to directly simulate human visual acuity and contrast sensitivity.

Paper Details

Date Published: 14 July 2003
PDF: 8 pages
Proc. SPIE 4951, Ophthalmic Technologies XIII, (14 July 2003); doi: 10.1117/12.482467
Show Author Affiliations
Pier Giorgio Gobbi, Univ. Hospital San Raffaele (Italy)
Francesco Fasce, Univ. Hospital San Raffaele (Italy)
Stefano Bozza, Univ. Hospital San Raffaele (Italy)
Rosario Brancato, Univ. Hospital San Raffaele (Italy)

Published in SPIE Proceedings Vol. 4951:
Ophthalmic Technologies XIII
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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