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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: D.de Fez SPAIN

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

Abstract Details

Purpose:

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).

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. 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

Results:

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

Conclusions:

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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