Posters

Analysis of the clinical outcomes of trans-epithelial PRK using Amaris 1050RS excimer laser in extremely high myopia (more than -8 diopter): comparison of trans-PRK with LASEK (surface ablation with alcohol) and EVO-ICL in extremely high myopia

Poster Details

First Author: J.Oh SOUTH KOREA

Co Author(s):                        

Abstract Details

Purpose:

To compare the clinical outcomes(efficacy, safety, predictability, effective ablation zone, wavefront data) following Trans-PRK and LASEK(Surface ablation with alcohol) using Amaris 1050RS Eximer Laser and compare Wavefront Data(WD) following Trans-PRK, LASEK and EVO-ICL (V4c ICL; Starr Surgical, Switzerland) in extremely high myopia (more than -8Diopter).

Setting:

190 extremely high myopic eyes with or without astigmatism were treated by Trans-PRK, LASEK and EVO- ICL. 72 eyes underwent Trans-PRK, 42 eyes underwent LASEK using Amaris 1050RS Eximer Laser and 76 eyes underwent EVO-ICL.

Methods:

Trans-PRK and LASEK groups were compared by Uncorrected Distance Visual Acuity (UDVA), refractive efficacy and stability at postoperative 2weeks, 2months and 6months. The difference between topographic Effective Optical Zone (EOZ) and Planned Optical Zone (POZ) after Trans-PRK & LASEK were compared at postoperative 2months. To compare for visual quality, pre-&postoperative WD(Root-Mean-Square (RMS), Spherical(SA) & Higher Order Aberrations(HOAs)) with Trans-PRK, LASEK & EVO- ICL were evaluated. Pre-&postoperative WD and measurement of EOZ & POZ were performed with SIRIUS wavefront analyser.

Results:

UDVA(log MAR) in Trans-PRK(0.04±0.09) at 2wks showed faster recovery than LASEK(0.14±0.11). Spherical Equivalent(SE) at 6mths was -0.07±0.68D in Trans-PRK and -0.33±0.85D in LASEK. Variation of SE between 2wks and 6mths was smaller in Trans-PRK (0.23±0.07D) than LASEK (0.58±0.19D). Topographic EOZ in Trans-PRK was larger (0.37±0.38mm) than POZ. In LASEK, topographic EOZ was smaller (-0.38±0.24mm) than POZ. WD(RMS:5mm) in Trans-PRK improved from preop data. In LASEK, all WD increased. Postop WD with EVO- ICL did not show statistically significant difference in comparison to preop WD.

Conclusions:

Trans-PRK using Amaris 1050RS Eximer Laser was a safe, effective and predictable procedure to correct extremely high myopia. Trans-PRK group showed rapid vision recovery, refractive stability and better vision quality than LASEK. Trans-PRK group showed improvement(12.8%) of WD (RMS: 5mm) compared to preoperative WD, while other data increased. EOZ largeness(6.8%) than POZ was accounted for this result. But in cases of large pupil, high demand of vision quality, EVO- ICL should be considered first because all WD were more stable compared to other groups.

Financial Disclosure:

None