Optical metrology for immersed diffractive multifocal ophthalmic intracorneal lenses

P. Tankam; T. LÃ©pine; F. Castignoles; P. Chavel

doi:10.2971/jeos.2012.12037

Journal of the European Optical Society - Rapid publications, Vol 7 (2012)

Optical metrology for immersed diffractive multifocal ophthalmic intracorneal lenses

P. Tankam, T. LÃ©pine, F. Castignoles, P. Chavel

Abstract

This paper deals with the optical characterization of diffractive multifocal Intra-Corneal Lenses (ICLs) that we have developed in order to correct presbyopia. These diffractive multifocal lenses are made of a very soft material (permeable to oxygen and nutrients), with a thickness smaller than 100 Âµm and require liquid immersion. As a consequence, most of the conventional metrology methods are unsuited for their characterization. We developed specific setups to measure diffractive efficiencies and Modulation Transfer Function (MTF) adapted to such components. Experimental results are in good agreement with ZemaxÂ® simulations. For the best of our knowledge, it is the first time that optical characterization is devoted to the ICLs. Furthermore, most of the IOLâ€™s optical characterizations are focused on far vision MTF and donâ€™t assess the near vision MTF, which we study in this paper.

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