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Optical role of the tear film meniscus in a specific model of multifocal fully scleral contact lens

Poster Details

First Author: M.Caballero SPAIN

Co Author(s):    A. Tolosa   D. Pinero   D. de Fez   V. Camps           

Abstract Details


To evaluate the optical role of the tear film meniscus in eyes fitted with a specific model of multifocal fully scleral lens (MFSL) inducing negative spherical aberration (SA)


Department of Optics, Pharmacology and Anatomy. University of Alicante


Optical simulations were performed using the optical design software OPTALIX (Optenso, Heerbrugg, Switzerland) and a modified version of the Navarro eye model with three different SA 0.40, 0.00 and -0.2 �ï��­m. A MFSL design was simulated with conic constants of -0.1 and -0.4 for the anterior and posterior lens surfaces. The effect on the modulation transfer function (MTF) was calculated with each model for a 6-mm pupil, optotype of visual acuity 0.20 logMAR, vergence levels among 0 and 6 D, and tear film meniscus between 50 and 250 �Â�µm


In the model eye with SA of 0.4 �Â�µm, there was a decrease in the MTF factor with increasing meniscus thickness for vergence levels between -1 and -3 D, with the worst outcome for the meniscus of 250 �Â�µm. A similar trend was also observed in the model eye with SA of -0.2 �Â�µm. In contrast, the reduction of the MTF with increasing meniscus thickness was minimal in the model eye with SA of 0.00 �Â�µm


The induction of negative SA for increasing the depth of focus with MFSL has a different optical impact depending on the meniscus thickness and therefore it should be considered in the fitting guides of this type of lenses

Financial Disclosure:

research is funded, fully or partially, by a competing company

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