Related Experiment Video
Updated: Jun 20, 2026
Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
Published on: September 20, 2024
Stability of the posterior corneal surface after laser surface ablation for myopia
Hae Jung Sun1, Jong Woon Park, Sun Woong Kim
1Department of Ophthalmology, Soonchunhyang University Hospital, Bucheon, Korea.
Purpose:
The purpose of this study was to evaluate changes in the posterior corneal surface before and after laser surface ablation using the Pentacam.
Methods:
Thirty consecutive myopic eyes having laser surface ablation (14 photorefractive keratectomies, 16 laser-assisted subepithelial keratectomies) were evaluated preoperatively and postoperatively with the Pentacam. Changes in the posterior corneal curvature, posterior elevation, and anterior chamber depth were measured.
Results:
The 30 eyes had a mean correction of -4.50 D (range, -2.12 to -8.0) and a mean ablation depth of 58.4 microm (range, 21-106 microm). The change in mean posterior corneal curvature was -0.02 +/- 0.07 mm in the central 4-mm zone (P = 0.106) and the mean posterior displacement was 0.47 +/- 4.23 microm (P = 0.551). The mean change in the anterior chamber depth was -0.06 +/- 0.08 mm (P < 0.001). The amount of forward shift of the posterior corneal surface had no correlation with the residual corneal thickness and ablation depth.
Conclusions:
There was no significant change in the posterior corneal surface after laser surface ablation.
