98th Annual Meeting DOG 2000

R 743

Increase of best-corrected visual acuity by Excimer laser PRK taking topography and aberrometry into account

D. Dausch, E. Schroeder

Introduction: Today, in Excimer laser ablation, topographic and aberrometer data are taken into account for the correction of refraction errors. Based on these treatment parameters, the postoperative best-corrected visual acuity shall be improved.

Methods: To answer the question if and to what extent such parameters influence the best-corrected visual acuity, a small group of patients was selected with myopia of less than 8 D and a cylinder of less than 1.5 D. In these cases, a topography-guided PRK was computed by means of a software from Aesculap-Meditec. In addition, aberrometer measurements were taken in order to include the additional intraocular wavefront aberrations. These were added as relatively small amounts when computing the ablation profile, and the treatment was performed.

Results: One month postoperatively, all eyes gained one or several lines in best-corrected visual acuity. Particularly the loss in visual acuity at low contrast and dazzling known as being associated with Excimer laser corrections was clearly reduced.

Discussion: Although the number of eyes tested was small and definite conclusions cannot be drawn yet, it becomes evident that the method involves capabilities for a considerable improvement in the quality of corneal ablation by correction of refractive errors.

Prof. Dr. med. D. Dausch, Bahnhofstr. 19, D – 92224 Amberg