gms | German Medical Science

102. Jahrestagung der DOG

Deutsche Ophthalmologische Gesellschaft e. V.

23. bis 26.09.2004, Berlin

Optical quality of the cornea after incisional astigmatic correction

Meeting Abstract

  • corresponding author T. Böhm - Klinik für Augenheilkunde, Vivantes Klinikum Neukölln, Berlin
  • C. Wirbelauer - Klinik für Augenheilkunde, Vivantes Klinikum Neukölln, Berlin
  • A. Bauer - Klinik für Augenheilkunde, Vivantes Klinikum Neukölln, Berlin
  • H. Häberle - Klinik für Augenheilkunde, Vivantes Klinikum Neukölln, Berlin
  • D.T. Pham - Klinik für Augenheilkunde, Vivantes Klinikum Neukölln, Berlin

Evidenzbasierte Medizin - Anspruch und Wirklichkeit. 102. Jahrestagung der Deutschen Ophthalmologischen Gesellschaft. Berlin, 23.-26.09.2004. Düsseldorf, Köln: German Medical Science; 2004. Doc04dogFR.08.03

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

Published: September 22, 2004

© 2004 Böhm 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.




Unilateral lamellar keratotomy (LKT) and curved dual lamellar keratotomy (BLK) were compared to evaluate the influence of incisional correction of astigmatism on the optical quality of the cornea.


42 patients with a preoperative astigmatism greater than 1,5 diopters were studied. 30 eyes received a LKT during cataract surgery and 22 eyes were treated with a BLK. Preoperatively and 4 weeks after surgery the corneal topographical data was analyzed with ray-tracing in a 3 mm optical zone. The potential visual acuity (PVA) and the optical distortion (OD) were calculated as parameters for the optical quality.


The mean surgically-induced astigmatism was 2,59±1,49 D for the LKT-group and 3,46±1,41 D for the BLK-group. The PVA decreased significantly in the LKT-group from 1,22±0,25 to 0,99±0,27 (P=0,008), whereas in the BLK-group the PVA remained unchanged from 0,87±0,17 to 0,85±0,22 (P=0,916). The OD increased from 6,65±0,91 μm to 7,86±2,01 μm (P=0,007) in the LKT-group. In the BLK-group the values were stable at 8,8±1,7 μm and 8,38±2,2 μm (P=0,843).


Both incisional methods achieved a good correction of astigmatism. However, the optical quality of the cornea decreased after unilateral keratotomy in the early postoperative period. Thus, the optical quality values should also be considered to further improve astigmatic corneal surgery.