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Changes in the Long-term Postoperative Astigmatism after Cataract Operation with Silicon-lens Implantation using a Clear-cornea and Sclero-corneal Incision
1Cordes A. K., 2Behrendt S., 3Duncker G. I. W., 4Wiechens B.,
1RWTH Aachen, Universitätsaugenklinik (Aachen)
2Augenklinik Rendsburg (Rendsburg)
3Martin-Luther-Universität, Klinik und Poliklinik für Augenheilkunde (Halle/Saale)
4Klinikum Hannover Nordstadt, Augenklinik (Hannover)
Background: To achieve a high level of patient satisfaction after cataract operation it is necessary to minimize the astigmatism induced by the operation. This prospective study was performed to compare two incisions of the same width at different locations.
Method: 86 eyes were randomised into two groups, which were operated on using either a scleral-tunnel-incision or a clear-cornea-incision. A foldable intraocular silicone lens was implanted through a 3.5 mm incision at the 12h-position. The postoperative control examinations were performed after two days and half a year.
Results: The induced astigmatism was calculated according to the formula published by Seiler and Wollensak and analyzed with the Wilcoxon test for connected samples. With respect to the total astigmatism it could be shown that both operative methods induce an astigmatism which did not differ statistically and declined in the long-term course. Vector analysis of the changes in the axis of astigmatism with and against the rule revealed a significantly smaller astigmatism with the rule (p<0,0001) in the scleral-tunnel-incision group after two days. At the same time a significantly smaller astigmatism against the rule was shown in the group of patients operated on in clear-cornea technique (p<0,0001). Half a year after the operation no statistically significant differences could be observed.
Conclusions: According to our results both operative methods can be regarded as equivalent in respect to induced astigmatism in the long-term course.