Vector analysis after implantation of a new toric intraocular lens for the correction of corneal astigmatism during cataract surgery

Poster Details

First Author: AloisDexl AUSTRIA

Co Author(s):    Alexander Bachernegg   Eva Arlt   Eva Krall   Theresa Rückl   Günther Grabner  

Abstract Details

Purpose:

To analyze the astigmatic changes after cataract surgery with the implantation of a new toric intraocular lens (IOL) using the Alpins vector method.

Setting:

: Paracelsus Medical University Salzburg (Austria), Dept. of Ophthalmology

Methods:

Aspheric Bi-Flex T toric IOLs were monolaterally or bilaterally implanted after phacoemulsification in patients with topographic corneal astigmatism between 1.5 diopters (D) and 4.0 D. Appropriate IOL-torus alignment was facilitated by combined imaging and eye-tracking technology. Refractive astigmatic changes (target astigmatism [TIA]; surgically induced astigmatism [SIA]; difference vector [DV]; correction index [CI]) were analyzed using the Alpins vectorial method within the first year after implantation.

Results:

The mean refractive astigmatism decreased from 1.93 D ± 0.90 to 0.30 ± 0.54 D. Patients achieved a mean uncorrected distance visual acuity of 0.05 ± 0.12 logMAR. The magnitude of the TIA vector was 0.6 X 180°, and the SIA vector was 0.8 x 177° generating a remaining DV of only 0.3 D x 82° and a CI of 1.16.

Conclusions:

Implantation of the new aspheric toric IOL was effective, safe, and stable in correcting preexisting regular corneal astigmatism during cataract surgery. Combined imaging and eye tracking seems to be a promising technology to evaluate the correct axis for IOL torus alignment. FINANCIAL INTEREST: ... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, ... research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented