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The changes of posterior corneal curvature measured by Sirius topography in post-femtosecond LASIK patients

Poster Details

First Author: Q.Wang CHINA

Co Author(s):                        

Abstract Details


To investigated changes of posterior corneal curvature (ΔK ) in post Femtosecond LASIK patients using Sirius topography, and to analyse its relationship with ablation percentage,ablantion depth,residual bed thickness and equivalent power.


Prospective, non-random case series.


Seventy-three post Femtosecond LASIK patients (146 eyes; aged19~41 years, mean 23.7±5.1 years; equivalent power , -9.00~-3.00 D, mean-5.21±1.07D ) were recruited in this study.The posterior corneal curvature was measured by Sirius topography preoperatively and at one month post-surgery.The correlation between ΔK and ablation percentage,ablantion depth,residual bed thicknessand equivalent power were analyzed.


The posterior corneal curvature increased from -5.89±0.74D preoperatively to -7.01±0.81D at 1 month post-surgery. The ΔK was positively correlated with ablation percentage(r=0.213, P=0.025)and ablantion depth(r=0.197, P=0.032).The ΔK was negatively correlated with equivalent power(r=-0.246, P=0.019) and residual bed thickness(r=-0.329, P=0.013).


The ΔK is related to ablation percentage, ablantion depth, equivalent power and residual bed thickness.

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