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Comparison of surgically-induced astigmatism between trabeculectomy and ExPRESS shunt

Poster Details

First Author: H.Takeshita JAPAN

Co Author(s):    Y. Yamamoto   T. Tsuji   R. Yamakawa        

Abstract Details


There have been few reports on surgically induced astigmatism after trabeculectomy or ExPRESS shunt. We retrospectively examined cases with surgically induced astigmatism after either of these procedures.


Department of Ophthalmology, Kurume University Hospital.


This study included 81 eyes of 73 patients who underwent trabeculectomy or ExPRESS shunt as an initial glaucoma surgery. Thirty-four eyes of 31 patients underwent trabeculectomy (trabeculectomy group). Forty-seven eyes of 42 patients underwent ExPress shunt (ExPRESS group). Corneal thickness was measured with the Pentacam® (Oculus, Wetzlar, Germany), and preoperative and postoperative corneal astigmatism was measured with the Auto Kerato-Refractometer KR7100® (Topcon, Tokyo, Japan). Surgically induced astigmatism at 1 month and at 6 months was calculated with the SIA Calculator Version 1.1©2010.


Preoperative intraocular pressure (IOP) was 30.5±8.1 mmHg in trabeculectomy group and 26.6±5.7 mmHg in ExPRESS group. Postoperative IOP in trabeculectomy group and ExPRESS group was 13.1±5.4 mmHg and 10.6±5.9 mmHg at one month and 13.2±3.7 mmHg and 10.8±3.5 mmHg at six months, respectively. Postoperative IOP was significantly decreased compared with preoperative IOP. Surgically induced astigmatism in trabeculectomy group and ExPRESS group was 2.0±1.4 D and 2.1±1.9 D at one month and 1.2±0.7 D and 1.5±1.0 D at six months, respectively, with a trend toward decreasing amount of astigmatism over time. We evaluated factors for age, final visual acuity, IOP, change in IOP (preoperative IOP-postoperative IOP), and corneal thickness. There was no correlation among variables and no significant difference between the groups.


There was no difference in surgically induced astigmatism between trabeculectomy and ExPRESS shunt, and the astigmatism gradually decreased with time. FINANCIAL INTEREST: NONE

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