ESCRS - PO494 - Comparison Of Visual Outcomes And Performance Of Topography-Guided Versus Wavefront-Optimised Lasik Using Ray Tracing Aberrometry (Itrace).

Comparison Of Visual Outcomes And Performance Of Topography-Guided Versus Wavefront-Optimised Lasik Using Ray Tracing Aberrometry (Itrace).

Published 2022 - 40th Congress of the ESCRS

Reference: PO494 | Type: Free paper | DOI: 10.82333/a7kw-k227

Authors: Sraddha Limbu 1 , Amit Gupta* 1 , Mayur Jain 1 , Barkha Gupta 1 , Arun K Jain 1 , Chintan Malhotra 1 , Sonam Yangzes 1

1Advanced Eye Centre,PGIMER,Chandigarh,India

Purpose

Comparison of visual outcomes and performance of Topography-guided versus Wavefront-optimised LASIK using Ray Tracing aberrometry (iTrace). 

Setting

Cataract, Cornea and Refractive Services,
Advanced Eye Centre,

Post Graduate Institute of Medical Education and Research (PGIMER),
Chandigarh, India.

Methods

This contralateral-eye study included 80 LASIK patients (160 eyes) randomised into: TG LASIK or WFO LASIK. Visual parameters, contrast sensitivity and iTrace parameters were compared at baseline versus 3 months postoperatively.

Results

TG versus WFO LASIK eyes, MRSE was -0.03 ± 0.136 versus -0.01 ± 0.14, (P
= 0.446), spherical aberration induced per diopter 0.01±0.008 versus 0.00±0.013 (p=0.008), corneal coma 0.01 ± 0.019 versus 0.02 ± 0.019 (p=0.010), Q value 0.18 versus 0.21 (p=0.024), corneal Strehl ratio -0.08± 0.072 versus -0.08±0.078 and modulation transfer function -0.07±0.055 versus - 0.07± 0.063, actual ablation depth per diopter 16.02 ± 3.05 μm versus 16.24 ± 3.92 μm. There was no difference in contrast.

Conclusions

While both TG and WFO LASIK had comparable visual performance, there
were significant differences in the postoperative corneal aberration profiles by ray tracing aberrometry, which may determine the surgeons choice of procedure for refractive surgery.