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Applanation Tonometry after Lasik

Kohlhaas M., Pollack K., Spörl E., Pillunat L. E.,
Universitätsklinikum Carl Gustav Carus, Klinik und Poliklinik für Augenheilkunde (Dresden)

Purpose: Because of the changed corneal thickness and curvature applanation tonometry readings after Lasik are too low.
Method: A Lasik was performed with the Amadeus-Microkeratome and the Schwind-Multiscan on 59 patients, 101 eyes. We measured pre- und postoperative: Refraction, corneal thickness, corneal curvatureund and the IOP.
Results: The pre- und (postoperative) parameters: Refraction (Dpt): -6,21±2,11 (0±0,68), corneal thickness (µm): 541±34,5 (466,4±39,7), corneal curvature (Dpt): 43,34±1,59 (38,5±2,08), IOP (mmHg): 16,5±2,1 (12,9±1,9). 88,12% of the patients had after the operation a lower IOP, 4,95% a higher one.
Conclusions: With multiple regressionanalysis a formula for the correction of the too low measured IOP after the operation is evaluated. A change of corneal thickness of 66 µm or a correction of 2,7 Dpt corresponds to 1 mmHg.

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