Paired opposite clear corneal incision: Time-related changes of its effect and factors on which those changes depend

Gabor Nemeth, Bence Kolozsvari, Andras Berta, Laszlo Modis

Research output: Article

3 Citations (Scopus)


Purpose: To assess astigmatism induced by paired opposite clear corneal incision (OCCI) compared to single incisions and to investigate factors on which its effect depends. Methods: The study comprised 326 eyes from 326 patients. In patients with <1.0 D corneal astigmatism, clear corneal incision was performed (CC group, n = 245), and in those with >1.0 D preoperative corneal astigmatism, a second, opposite clear corneal incision was made (OCCI group, n = 81). Both groups consisted of superior, temporal, and oblique subgroups according to the steepest meridian. Prior to the surgery, and after surgery, repeated keratometry was performed and surgically induced astigmatism (SIA) was calculated using vector analysis. Results: Two weeks after the surgery, the SIA was 0.67 ± 0.44 D in the CC group and 1.15 ± 0.65 D in the OCCI group; 9 weeks after the operation, it was 0.61 ± 0.43 D in the CC group and 0.99 ± 0.57 D in the OCCI group (p<0.001). The SIA showed no significant postoperative change in our groups. Conclusions: Opposite clear corneal incision reliably induces about 1.0 D of corneal astigmatism on the steep meridian in proportion to the rate of preoperative astigmatism. Its magnitude is independent of the location of the incisions and its effect remains unchanged during the postoperative period.

Original languageEnglish
Pages (from-to)676-681
Number of pages6
JournalEuropean Journal of Ophthalmology
Issue number5
Publication statusPublished - jan. 17 2014


ASJC Scopus subject areas

  • Ophthalmology

Cite this