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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

Purpose:

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)

Setting:

Department of Optics, Pharmacology and Anatomy. University of Alicante

Methods:

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

Results:

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

Conclusions:

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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