Automated assessment of point spread function break up time after laser vision correction procedures
First Author: Y.Weill ISRAEL
Co Author(s): D. Zadok A. Abulafia L. Wasser A. Shoshani D. Smadja
To analyze the early postoperative impact of laser vision correction procedures on the stability of the visual function using a double-pass aberrometer device.
Ophthalmology Department, Shaare Zedek Medical Center, Jerusalem, Israel. iSEARCH, Innovation Shaarezedek Eye Advanced Research Center Hub, Jerusalem, Israel
Retrospective and comparative study including 100 eyes of 100 patients analyzed preoperatively and 3 months after PRK (50 eyes) and LASIK (50 eyes). The visual function stability analysis was performed using a double-pass aberrometry (HD Analyzer, Visiometrics S.L, Terrassa, Spain) and included vision break-up time (VBUT), objective scattering index (OSI), modulation transfer function (MTF), and Strehl Ratio (SR). Results were compared between PRK and LASIK surgery.
No statistical significant difference was found at 3 months postoperatively in VBUT, with mean changes of 0.38± 1.11 (p = 0.24) and 0.33± 2.95 (p = 0.61), respectively in LASIK and PRK groups. No statistically significant difference in VBUT was observed at baseline (p=0.85) and at 3 months postoperative (p=0.13) between LASIK and PRK. Postoperative optical quality metric MTF, SR and OSI, remained unchanged at the 3 months follow up in both groups as compared to baseline values (p=0.11, p=0.23, p=0.39 respectively).
Both laser vision correction procedures, LASIK and PRK, were not associated with an early decrease in retinal point spread function stability nor degradation of optical quality parameters.