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Ulrike Sponer, Schmidinger Gerald, Christian Skorpik, Stefan Pieh; Superficial Excimerlaser Treatment in Case of High Corneal Aberrations of Higher Orders. Invest. Ophthalmol. Vis. Sci. 2012;53(14):1472.
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Abilities to improve the image quality in corneas with high aberrations of higher orders using an excimerlaser system of the newest generation.
In 37 eyes after perforating keratoplasty, lamellar keratoplasty, after corneal injuries and corneal inflammations with a spherical equivalent from 0 to -9.0 diopters and a corneal astigmatism up to 10.0 diopters a superficial excimerlaser treatment with mitomycin application was performed. Corneal aberrations of higher order were determined preoperatively (root-mean-square (RMS) error 2.36 µm ± 1,05; PV- value 15.98 µm ± 7.32; diameter 6mm). Ablationprofile was calculated using the corneal wavefront and the subjective refraction. All treatments were done with the Amaris-Excimerlaser (Schwind) at the Department of Ophthalmology and Optometry, Medical University Vienna.
The follow-up time was 12 month. In all patients the corneal haze was below stage 1. The RMS- error improved to 1.48 µm ± 0.79 (minus 37.7%); the PV - value to 10.34 µm ± 7.22). Furthermore coma, trefoil and the spherical aberration could be reduced significantly.
Superficial excimerlaser treatment is a valid option for improving image quality in case of corneas with high irregularities. Small spot diameters and modern eyetracking systems enable corrections of aberrations up to the fourth order.
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