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LASIK for spherical refractive myopia: effect of topographic astigmatism (ocular residual astigmatism

Poster Details

First Author: A.Frings GERMANY

Co Author(s):    J. Steinberg   S. Linke   C. Skevas   M. Casagrande   V. Druchkiv   T. Katz

Abstract Details


In eyes with a preoperative plano refractive cylinder, it would appear that there is no rationale for astigmatic treatment. The aim of the present study was to determine the amount of topographic astigmatism in refractive plano eyes that results in reduced efficacy after myopic LASIK.


University Medical Centre Hamburg-Eppendorf, Germany.


This retrospective, cross-sectional data analysis included 267 eyes from 267 consecutive myopic patients with a refractive plano cylinder. Receiver operating characteristic (ROC) analysis was used to find the cut-off values of preoperative ocular residual astigmatism (= topographic astigmatism) that can best discriminate between groups of efficiency (EI) and safety (SI) indices in preoperative plano refractive cylinder eyes.


Preoperative ORA (or topographic astigmatism) of ≤0.9 diopters (D) resulted in an EI of at least 0.8 statistically significantly more frequently than eyes with a preoperative ORA of >0.9 D. Eyes with a high ORA preoperatively also had a high ORA postoperatively. OLS regression shows that each diopter of preoperative ORA reduced efficiency 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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