Posters

The impact of visual axis position on optical quality after implantation of multifocal intraocular lenses with different asphericity values

Poster Details

First Author: K.Mihaltz AUSTRIA

Co Author(s):    P. Vecsei-Marlovits                    

Abstract Details

Purpose:

To evaluate the effect of visual axis positioning on the optical performance of the Tecnis MIOL and the Diff-aA MIOL.

Setting:

Department of Ophthalmology, Hietzing Hospital, Vienna, Austria Karl Landsteiner Institute of Process Optimization and QM in Cataract Surgery, Vienna, Austria

Methods:

In this prospective, randomized comparative study 70 eyes of 65 subjects with senile cataract were implanted with the spherical aberration correcting diffractive, bifocal Tecnis ZLB00 IOL, and 60 eyes of 30 age matched subjects with the spherical aberration neutral, diffractive, bifocal Diffractiva IOL. Observation Procedure was performed 1, 3, 6 months postoperatively. Main Outcome Measures included uncorrected and corrected distance and near visual acuity, manifest refraction, ocular aberrations and visual quality metrics with 2mm and 4mm pupil, and the position of visual axis.

Results:

At the 6 month visit no significant difference was found in monocular and binocular uncorrected (UDVA) and corrected (CDVA) distance and near (UNVA, CNVA) visual acuity between the groups. Spherical and coma like aberrations were similar measured with a 2mm pupil, but with a 4mm pupil the SA was significantly larger (in negative direction) in the Diffractiva group. The higher order Strehl ratio and MTF was significantly larger in the Diffractiva group measured at 2mm entrance pupil, however this difference disappeared by the 4mm pupil measurements. Postoperative angle alpha distance had a significant influence on HO Strehl value.

Conclusions:

The size of angle alpha is a predictive factor of image quality by multifocal IOL patients.

Financial Disclosure:

None