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Effect on the depth-of-focus of the induction of different levels of spherical aberration with multifocal fully scleral contact lenses

Poster Details

First Author: Fez SPAIN

Co Author(s):    A. Tolosa   V. Camps   M. Caballero   D. Pinero           

Abstract Details


To evaluate the effect of different levels of induction of spherical aberration (SA) on depth of focus (DoF) with multifocal fully scleral contact lenses (MFSL).


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. The MFSL design was simulated with a fixed conic constant for the posterior lens surface of -0.4 and a variable conic constant for the anterior surface. The modulation transfer function (MTF) was calculated with each model for a 6-mm pupil, spatial frequency of 18 cycles/�Â�º, vergence levels among 0 and 6 D, and with no tear film meniscus


For a vergence level of 3 D, the lens with a posterior conic constant of -0.3 provided the highest MTF value for the three eye models evaluated. In contrast, for a vergence level of 4 D, a posterior conic constant of -0.1 provides better MTF value in the eye models with SA of 0.00 and 0.40 �Â�µm. For intermediate distance (vergence level of 1 D), a posterior conic constant of -0.6 provides better MTF in the eye models with SA of 0.40 and -0.20 �Â�µm


A customized geometry of the posterior surface of a MFSL according to the ocular SA and the patient�â�€�™s vergence demands is required for optimizing the DoF provided

Financial Disclosure:

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

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