Postcataract against-the-rule astigmatism after phacoemulsification procedure. Characteristic changes over time.
To further determine whether postoperative astigmatism is related to the amount of preoperative astigmatism, we analyzed two types of against-the-rule (AR) astigmatism induced by phacoemulsification and aspiration (PEA) procedures. The operations all utilized 10-0 polyester (Mersilene) in double running fashion for the closure of the corneoscleral incisions. The induction and spontaneous regression of several types of astigmatism were analyzed over 6 months. Surgery was all done by one surgeon, with the same surgical procedure and the same number of sutures. In postoperative AR astigmatism less than 0.7 D at 6 months, although the amount of the astigmatism 1 week postoperatively was remarkably increased (2.66 +/- 0.17 D), postoperative astigmatism was decreased 6 months following surgery. On the other hand, in postoperative AR astigmatism greater than 1.5 D at 6 months, the power of the astigmatism 1 week postoperatively (2.12 +/- 0.13 D) was not much higher than the preoperative level (1.38 +/- 0.08 D), but tended to continue increasing even 6 months after surgery. There was no difference in the power of astigmatism between 1 and 3 months postoperatively. The eyes with preoperative astigmatism (e.g. 1.38 +/- 0.08 D) and especially preoperative AR astigmatism (e.g. 1.60 +/- 0.11 D), showed an increase of their astigmatism after the PEA procedure. We discussed some risk factors which may induce greater postoperative AR astigmatism.
Suzuki
R
R
Department of Ophthalmology, Yamaguchi University School of Medicine, Ube, Japan.
Tanaka
K
K
Fujiwara
N
N
Kurimoto
S
S
D001251:Astigmatism / Q000175:diagnosis* / Q000209:etiology; D002387:Cataract Extraction / Q000009:adverse effects*; D006801:Humans; D007910:Lenses, Intraocular; D011183:Postoperative Complications / Q000175:diagnosis*; D012307:Risk Factors