Abstract

DO.12.03

Postoperative induced astigmatism after micro incision cataract surgery

Buchwald H.-J., Ye Y., Lang G. K.
Augenklinik, Universität Ulm

Objective: Induction of corneal astigamtism by cataract surgery can be avoided by the use of very small incisions.
Methods: Extracapsular cataract surgery was performed in 47 eyes of 37 patients (age 58-90 years, mean 76 years) with senile cataracts. A 2 mm clear corneal tunnel incision was made and an intraocular lens (AcriSmart 48S, Fa. Acritec) was implanted in the capsule sac. Preoperatively and 1 day, 1 week and 6 weeks after the surgery visual acuity and keratometry (CSO Eye Top Topographer, Fa. Schwind) were measured. Postoperative induced astigmatism and change of axis of astigmatism were evaluated.
Results: Preoperatively the mean corneal astigmatism was 0.78 D + 0.30. The mean induced corneal astigmatism was 0.01 D + 0.59 after six weeks. The mean axis of corneal astigmatism changed to 15° + 11° postoperatively after six weeks. The mean best corrected (uncorrected) visual acuity was 20/25 (20/40) + 0.28 (0.15) six weeks after surgery. No intra- or postoperative complications were observed.
Conclusions: If cataract surgery is performed via a clear corneal tunnel incision of 2 mm, induced corneal astigmatism can almost be avoided. The axis of astigmatism was moderately affected by the surgery.

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