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

Die elektronische Version dieses Artikels ist vollständig und ist verfügbar unter: http://www.egms.de/de/meetings/dog2004/04dog224.shtml

Veröffentlicht: 22. September 2004

© 2004 Böhm et al.
Dieser Artikel ist ein Open Access-Artikel und steht unter den Creative Commons Lizenzbedingungen (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.de). Er darf vervielf&aauml;ltigt, verbreitet und &oauml;ffentlich zug&aauml;nglich gemacht werden, vorausgesetzt dass Autor und Quelle genannt werden.


Gliederung

Text

Objective

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.

Methods

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.

Results

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).

Conclusions

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.