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Vector analysis of regular corneal astigmatism correction during cataract surgery by implanting a bitoric IOL

Session Details

Session Title: Toric IOL Outcomes

Session Date/Time: Monday 07/10/2013 | 16:30-18:30

Paper Time: 17:51

Venue: Auditorium (First Floor)

First Author: : E.Krall AUSTRIA

Co Author(s): :    M. Hohensinn   E. Arlt   J. Alió   J. Mendicute   G. Grabner   A.

Abstract Details

Purpose:

Aim of this study was to determine astigmatic changes and postoperative refractive and visual outcomes after implantation of the AT TORBI® 709M toric IOL (Carl Zeiss Meditec AG, Jena, Germany) during routine cataract surgery.

Setting:

Prospective multicenter interventional case series; 1: Vissum-Instituto de Oftalmológico de Alicante, Spain; 2: Ophthalmology Service, Donostia Hospital, San Sebastiįn, Spain; 3:Department of Ophthalmology, Paracelsus Medical University of Salzburg, Austria

Methods:

Within a prospective multicenter interventional case series the IOL AT TORBI® 709M was implanted to correct preexisting corneal astigmatism during routine cataract surgery. IOL power calculation was done with the internet-based calculator Z CALC. Pre- and postoperatively corneal state, visual acuity, subjective and objective refraction and corneal radii (using a topographer) were examined in all patients. All patients had postoperative examinations within the first week (visit 1) and 6-12 weeks (visit 2) after surgery. The astigmatic changes were evaluated using Alpins vector method, based on the 3 fundamental vectors – target-induced astigmatism (TIA), surgically induced astigmatism (SIA) and difference vector. The various relationships between these 3 vectors were calculated, including flattening effect, torque, magnitude of error, angle of error and correction index, providing complete description of astigmatic correction achieved.

Results:

In three centers a total of 84 eyes (71 patients) have been included within this trial. Postoperatively refractive cylinder could be reduced significantly (p<0.05), concurrent with visual improvement. The magnitude of SIA vector was slightly larger than the magnitude of TIA vector 3 month postoperatively. The mean magnitude of difference vector was 0.74 ± 0.44 D 3 month postoperatively. The mean magnitude of error was 0.04 ± 0.57 D and the correction index was 1.04 ± 0.34 both indicating a minimal overcorrection at 3 month, but remained stable within the follow-up period.

Conclusions:

The implantation of the monofocal, aspheric, bitoric IOL AT TORBI® 709M seems to offer a safe and effective procedure for treatment of eyes presenting cataract in combination with pre-existing regular corneal astigmatism. To verify these first short-time results further studies are necessary.

Financial Interest:

NONE