Large series comparison between a new high-resolution and contemporary aberrometer in wavefront-guided LASIK to treat low to moderate myopia

Session Details

Session Title: Presented Poster Session 21: Keratorefractive Surgery Outcomes - Myopia 3

Session Date/Time: Tuesday 16/09/2014 | 09:30-11:00

Paper Time: 10:15

Venue: Pod 3 (Poster Village)

First Author: : S.Schallhorn USA

Co Author(s): :    S. Hannan              

Abstract Details

Purpose:

To provide a retrospective comparison of one month outcomes of wavefront-guided (WFG) LASIK using a new (iDesign, Abbott Medical Optics) and contemporary (WaveScan, Abbott Medical Optics) aberrometer for the treatment of low to moderate myopia.

Setting:

Multi-center practice in the UK (Optical Express)

Methods:

Consecutive WFG LASIK conducted in a multi-center practice in the UK (Optical Express) performed with either the new or contemporary aberrometer to treat low to moderate myopia (up to -6D sphere) and cylinder (up to 6D) were retrospectively analyzed. Flap creation methods and other surgical parameters were the same in both groups. Uncorrected visual acuity (UCVA) and predictability of refraction as well as patient-reported outcomes were evaluated at 1 month postoperative.

Results:

There were 8,905 consecutive eyes of 4,721 patients treated using the new aberrometer and 27,290 eyes of 14,589 patients treated with the contemporary aberrometer included in the study. Demographic and preop characteristics were well-matched between the two groups. At 1 month postop, more eyes achieved 20/16 and 20/20 uncorrected distant vision with the new aberrometer compared to the contemporary (new aberrometer: 84.0% and 95.4%; contemporary: 79.7% and 93.8% of eyes with 20/16 and 20/20 UCVA, respectively). The refractive predictability was excellent, with 95.4% and 93.9% of eyes were within 0.5 D of intended MSE in the new and contemporary groups, respectively. The cylinder correction ratio was >0.9 for all levels of astigmatism correction but the new aberrometer had less variance in outcomes and a significantly higher percentage of patients with <=0.5D of cylinder postoperative (95.8%) compared to the contemporary cohort (92.6%). The loss of > 2 lines of best corrected visual acuity was very low in both groups (0.1% and 0.2% in the new and contemporary groups). More patients were satisfied with the outcome of the procedure outcome with the new aberrometer (96.5% vs 95.2%, respectively, p=0.01, chi-squared).

Conclusions:

In this retrospective evaluation of early postoperative outcomes, the new aberrometer WFG LASIK had improved efficacy (UCVA, refractive predictability, and cylinder correction) and higher patient satisfaction compared to contemporary WFG LASIK.

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