Outcomes of LASIK for Myopic Astigmatism Using a 1,050-Hz Excimer Laser and Seven-Dimensional Eye Tracker

To evaluate the efficacy, predictability, and safety of laser in situ keratomileusis (LASIK) for the correction of myopia and myopic astigmatism using the SCHWIND Amaris 1050RS excimer laser (SCHWIND eye-tech-solutions).

This was a prospective cohort study of 1,420 eyes with myopia or myopic astigmatism that underwent LASIK in a single tertiary center between January 2017 and April 2022. The IntraLase iFS femtosecond laser (Johnson & Johnson Vision) was used for flap creation and excimer laser ablation was performed using the SCHWIND Amaris 1050RS with aspheric aberration-free ablation profile, asymmetric pupillary offset, and seven-dimensional eye tracking. Preoperative mean spherical equivalent was -5.81 ± 2.41 diopters (D) (range: -0.63 to -13.63 D).

At 3 months, 95.1% and 99.6% of eyes achieved uncorrected distance visual acuity of 20/20 and 20/40 or better, respectively. The mean efficacy index was 0.99 ± 0.06 and the mean safety index was 1.0 ± 0.02. For predictability, 97.7% and 99.7% of eyes were within ±0.50 and ±1.00 D of the intended correction, respectively. The mean postoperative spherical equivalent was +0.02 ± 0.21 D, mean cylinder was 0.13 ± 0.25 D, mean vector-analyzed magnitude of cylindrical error was 0.09 ± 0.22 D, mean cylindrical angle of error was 0.64 ± 6.79 degrees, and mean cylindrical vector difference was 0.15 ± 0.26 D. None had significant surgical complications.

This study demonstrates excellent efficacy, predictability, and safety of the SCHWIND Amaris 1050RS excimer laser for the correction of myopic astigmatism. The seven-dimensional eye tracker was effective in compensating for eye movements intraoperatively. [.