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Experimental correction of irregular corneal astigmatism using topography-based flying-spot-mode excimer laser
B Seitz1, A Langenbucher, M M Kus
1Department of Ophthalmology, University of Erlangen-Nürnberg, Germany. berthold.seitz@augen.med.uni-erlangen.de
Purpose:
To present a novel experimental approach for treating irregular corneal astigmatism.
Methods:
After decomposition of topographic analysis data into orthogonal Zernike polynomials, a regular target surface was defined, and the ablation profile was calculated. In a polymethylmethacrylate with an irregular surface, computer-controlled ablation was performed using a 193-nm excimer laser in "flying-spot mode."
Results:
The difference between flattest and steepest hemimeridians in the 3-mm zone, surface regularity index, and surface asymmetry index were reduced from 8.7 to 1.1 diopters, 1.19 to 0.39, and 1.84 to 0.14, respectively.
Conclusion:
Tying corneal topography into laser software offers a straightforward concept for correction of irregular corneal astigmatism in an experimental model.