gms | German Medical Science

102. Jahrestagung der DOG

Deutsche Ophthalmologische Gesellschaft e. V.

23. bis 26.09.2004, Berlin

Epithelial disk parameter after Epi-LASIK with the Centurion SES microkeratome

Meeting Abstract

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  • corresponding author P. Breil - Johannes Gutenberg University Mainz, Department of Ophthalmology, Mainz
  • L. Frisch - Johannes Gutenberg University Mainz, Department of Ophthalmology, Mainz
  • H. B. Dick - Johannes Gutenberg University Mainz, Department of Ophthalmology, Mainz

Evidenzbasierte Medizin - Anspruch und Wirklichkeit. 102. Jahrestagung der Deutschen Ophthalmologischen Gesellschaft. Berlin, 23.-26.09.2004. Düsseldorf, Köln: German Medical Science; 2004. Doc04dogSO.04.08

The electronic version of this article is the complete one and can be found online at:

Published: September 22, 2004

© 2004 Breil et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.




In contrast to the LASEK procedure the Epi-LASIK allows mechanical separation of the epithelium from the bowman layer without alcohol. In a pilot study we investigated epithelial disk ("flap") parameter intraoperatively after cut with the new Centurion SES microkeratome.


22 eyes of 11 patients, mean age 35 years were operated. Mean spherical equivalent was -3.3 dptr. (from -1.25 to -5.25 dptr.); mean astigmastism was -1.1 dptr. with a range from -0.25 to -2.5 dptr. Corneal thickness was measured directly before epithelial separation and after lifting the "flap" using the DGH 500 pachymeter (Fa. DGH Technology Exton, USA); the "flap" thickness was then calculated by substraction. The "flap" diameter and hinge width was measured with a special instrument, adapted at the curvature of the cornea.


The mean "flap" thickness valued 56.7 μm, ranging from 41 to 78 μm. In all cases an epithelial flap was separated, in no apparent case bowman layer was cut. The hinge width valued from 4.5 to 9.5 mm, mean 7.2 mm. In 4 cases a free "flap" occured, which could be exactly repositioned. "Flap" diameter ranged from 7.5 to 12.0 mm, mean 10.0 mm.


In the 22 myopic eyes Epi-LASIK, separation of the epithelium with the Centurion SES microkeratome was performed without complications. In order to achieve less variety in "flap" diameter, an individualisation of the mircokeratome ring size seems necessary.