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PRK versus transPRK in highly aberrated corneas

Poster Details

First Author: S.Pieh AUSTRIA

Co Author(s):    G. Schmidinger   C. Skorpik           

Abstract Details


Abilities to improve the image quality in corneas with high aberrations of higher orders using an excimerlaser system of the newest generation.


Medical University Vienna, Department of Ophthalmology and Optometry


PRK was performed in 37 and TransPRK in 21 highly aberrated eyes after perforating keratoplasty, lamellar keratoplasty, corneal injuries or corneal inflammations. Corneal aberrations of higher orders were determined preoperatively. Inclusion criteria were a spherical equivalent from 0 to -9.0 D, a corneal astigmatism up to 8.0 D and a RMS HOA Error of higher than 1.0 µm. Ablationprofile was calculated using the corneal wavefront and the subjective refraction. All treatments were done with the Amaris-Excimerlasersystem (Schwind).


The follow – up time was 12 month. The RMS HOA improved in the PRK group to from 2.42µm ± 0.99 to 1.48 µm ± 0.79 and in the TransPRK group from 2.45µm ± 0.96 to 1.52µm ± 0.81. Furthermore the spherical aberration could be reduced to a normal value in both groups.


Superficial excimerlaser treatment is a valid option 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. There were no significant differences for the outcome between PRK and TransPRK . FINANCIAL DISCLOSURE?: No

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