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Effect of topographic astigmatism on refractive outcome in myopic eyes

Poster Details

First Author: A.Frings GERMANY

Co Author(s):    J. Steinberg   V. Druchkiv   T. Katz   S. Linke           

Abstract Details


In eyes with a preoperative plano refractive cylinder, it would appear that there is no rationale for astigmatic treatment. The aim of this retrospective, cross-sectional data analysis was to determine the amount of topographic astigmatism in refractive plano eyes that results in reduced efficacy after myopic laser in situ keratomileusis (LASIK).


Medical University Hospital Hamburg-Eppendorf, Germany; Universitätsklinikum Erlangen, Germany


This study included 267 eyes from 267 consecutive myopic patients with a refractive plano cylinder. Receiver operating characteristic analysis was used to find the cut-off values of preoperative topographic astigmatism that can best discriminate between groups of efficacy and safety indices in preoperative plano refractive cylinder eyes.


Preoperative topographic astigmatism of ≤0.9 diopters (D) resulted in an efficacy index of at least 0.8 statistically significantly more frequently than eyes with a preoperative ORA of >0.9 D. Eyes with a high topographic astigmatism preoperatively also had a high topographic astigmatism postoperatively. Regression analysis showed that each diopter of preoperative topographic astigmatism reduced efficacy by 0.07.


A preoperative corneal astigmatism of ≥0.9 D could (partially) be taken into account in the LASIK design, even if the subjective refractive astigmatism is neutral.

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