Posters

AT LISA tri toric 939MP: clinical and refractive results

Poster Details

First Author: T.Monteiro PORTUGAL

Co Author(s):    N. Franqueira   F. Faria Correia   R. Dourado Leite   K. Oliveira   J. Mendes   F. Vaz

Abstract Details

Purpose:

To evaluate the eficcacy and effectiveness of refractive lensectomy with toric trifocal intraocular lens (IOL) implantation with AT LISA tri toric 939MP (Carl Zeiss Meditec, Jena, Germany) for the correction of presbyopia.

Setting:

Hospital Braga, Braga, Portugal Hospital CUF, Porto, Portugal

Methods:

Prospective non-randomized study, including all patients submitted to bilateral and symetric implantation of the AT LISA tri toric 939MP after crystaline lens extraction for the correction of presbyopia. Inclusion criteria: minimum follow-up 3 months, BCVA pre-operative of 20/25 or superior, corneal astigmatism > 1,00 D and angle to angle horizontal and vertical distance > 11,00 mm (OCT Visante, Carls Zeiss). Parameters evaluated: uncorrected (UCVA) and corrected (BCVA) distance visual acuity (snellen chart) for far, intermediate (80 cm) and near (40 cm) distances, manifest refraction, constrast sensitivty charts under photofpic and mesopic conditions, defocus curve, the degree of IOL rotation after surgery. All surgeries were performed under topical anaesthesia, using a 2.40 mm incision, and a preloaded capsular tension ring (Morcher®) was implanted. The lens power was selected using optical biometry with coherence interferometry (IOL-Master®, Carl Zeiss Meditec, Jena, Germany) and the online IOL calculator available for toric lenses.

Results:

A total of 40 eyes were analyzed, corresponding to 20 patients who underwent bilateral implantation, with a follow-up that ranges from 1 to 6 months. The mean axial length was 22,99 mm (range between 20,77 and 26.28 mm), mean IOL cylinder implanted was 2.,32 (range from 1,00 to 3,50 D). Postoperative refractive results: mean spherical error of -0,08 D, mean cylindrical subjective refractive error of -0.49 D. No patient lost lines of BCVA. Postoperative uncorrected monocular vision: 0.94, 0.94 and 0.75 for distances far, intermediate and near, respectively. Defocus curve demonstrates an uncorrected visual acuity of 20/25 or better in binocular vision for all distances. No YAG posterior capsulotomies were performed at 12 months. All patients are glasses independente for all tasks of near and intermediate distance. The rate of halos/glare reported was less than 20% of patients. We observed no rotation of the IOL during follow-up, all IOL's under 5 degree of intended vs achieved target axis of implanattion. Contrast sensivity was within normal range for all light conditions.

Conclusions:

The trifocal lens AT LISA tri toric 939MP proved to be effective and safe in the correction of presbyopia, revealing a high level of visual acuity for distances far, intermediate and near. The toric IOL platform provides the same visual and refractive results as the spherical model, showing a safe and effective correction of corneal astigmatism. FINANCIAL INTEREST: NONE