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Proceedings Paper

Optical aberrations induced by subclinical decentrations of the ablation pattern
Author(s): Michael Mrochen; Maik Kaemmerer; Peter Riedel; Peter Mierdel; Hans-Eberhard Krinke; Theo Seiler
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Paper Abstract

Purpose: The aim of this work was to study the effect of currently used ablation profiles along with eccentric ablations on the increase of higher order aberrations observed after PRK. Material and Methods: The optical aberrations of 10 eyes were tested before and after PRK. Refractive surgery was performed using a ArF-excimer laser system. In all cases, the ablation zone was 6 mm or larger. The spherical equivalent of the correction was ranging from -2.5 D to -6.0 D. The measured wavefront error was compared to numerical simulations done with the reduced eye model and currently used ablation profiles as well as compared with experimental results obtained from ablation on PMMA balls. Results: The aberration measurements result in a considerable change of the spherical- and coma-like wavefront errors. This result was in good correlation with the numerical simulations and the experimental results. Furthermore, it has been derived that the major contribution on the induced higher order aberrations are a result of the small decentration (less than 1.0 mm) of the ablation zone. Conclusions: Higher order spherical- and coma-like aberrations after PRK are mainly determined by the decentration of the ablation zone during laser refractive surgery. However, future laser systems should use efficient eye-tracking systems and aspherical ablation profiles to overcome this problem.

Paper Details

Date Published: 7 June 2000
PDF: 9 pages
Proc. SPIE 3908, Ophthalmic Technologies X, (7 June 2000); doi: 10.1117/12.387532
Show Author Affiliations
Michael Mrochen, Univ. of Dresden (Switzerland)
Maik Kaemmerer, Univ. of Dresden (Germany)
Peter Riedel, Univ. of Dresden (Germany)
Peter Mierdel, Univ. of Dresden (Germany)
Hans-Eberhard Krinke, Univ. of Dresden (Germany)
Theo Seiler, Univ. of Dresden (Germany)


Published in SPIE Proceedings Vol. 3908:
Ophthalmic Technologies X
Pascal O. Rol; Karen Margaret Joos; Fabrice Manns, Editor(s)

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