Vector analysis, rotational stability and visual outcome after implantation of a new toric intraocular lens for the compensation of regular corneal astigmatism during cataract surgery

Session Details

Session Title: Toric IOLs

Session Date/Time: Sunday 14/09/2014 | 16:30-18:30

Paper Time: 17:39

Venue: Capital Hall B

First Author: : A.Dexl AUSTRIA

Co Author(s): :    A. Bachernegg   E. Krall   E. Arlt   C. Strohmaier   G. Jell   G. Grabner

Abstract Details

Purpose:

To evaluate vector analysis, rotational stability, refractive and visual outcome of a new toric intraocular lens (tIOL) for correction of preexisting corneal astigmatism during routine cataract surgery.

Setting:

Paracelsus Medical University Salzburg, Department of Ophthalmology

Methods:

In this prospective, interventional case-series 30 toric, aspheric Bi-Flex T tIOL’s were implanted in 20 patients with topographic corneal astigmatism between 1.5 and 4.0 D and evaluated within the first year after implantation. Appropriate IOL-Torus alignment was facilitated by combined imaging/eye-tracking technology. Postoperative evaluation included refraction, as well as uncorrected and corrected distance visual acuities (UDVA, CDVA). For each visit photodocumentation in retroillumination was performed to evaluate torus position and potential tIOL rotation. Vector analysis of refractive astigmatism was performed using Alpins method.

Results:

At 12 months a reduction of the refractive astigmatism from 1.93±0.90 D (range: 0.50 to 4.0) to 0.01±0.12 D (range: 0 to 1.5) could be found with patients achieving mean UDVA of 0.06±0.16 logMAR (range: -0.18 to 0.40; ~20/20). Intraoperative to 12 month postoperative comparison of IOL axis alignment showed low levels of rotation (1.3±1.66°; range: -4° to +5°). Vector Analysis showed Target Induced Astigmatism of 2.35±0.66, Surgically Induced Astigmatism of 2.39±0.73, Correction Index of 1.02±0.25 and a Difference Vector of 0.41±0.45.

Conclusions:

Implantation of the new Bi-Flex T IOL was a safe, stable and effective method to correct preexisting regular corneal astigmatism during cataract surgery. To evaluate the correct axis for IOL torus alignment combined imaging/eye-tracking technology seems to be a promising technology.

Financial Interest:

One or more of the authors... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, One or more of the authors... research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented