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Abstract #60550 Published in IGR 16-4
The Effect of Trabeculectomy on Astigmatism
Delbeke H; Stalmans I; Vandewalle E; Zeyen TJournal of Glaucoma 2016; 25: e308-e312
PURPOSE: To investigate the change in corneal astigmatism after trabeculectomy. PATIENTS AND METHODS: Between January and April 2012, patients who underwent a primary trabeculectomy were enrolled in this prospective study. We measured the visual acuity, automated keratorefractometry, and the intraocular pressure preoperatively and postoperatively at 1, 3, and 6 months. Changes in astigmatism were quantified using the vector analysis described by Cravy. A Friedman test and a linear model for longitudinal measures were used to compare changes in the refraction and the intraocular pressure. A binomial test was used to compare the proportion of eyes with a shift in astigmatism with or against-the-rule. RESULTS: A total of 47 eyes (47/48 patients) were included for analysis. The mean (±SD) intraocular pressure decreased from 17.5±5.4 mmHg preoperatively to 9.8±4.0 mmHg after 6 months (P<0.001). At this time-point, 32/47 eyes showed a shift in astigmatism with-the-rule (P=0.02), with a median difference in cylinder of +0.50 D (range, 0 to 4 D) (P=0.004). The mean (±SD) axis of the positive cylinder changed from 169±148 to 135±146 degrees after 6 months (P=0.12) and the mean (±SD) spherical equivalent changed from -0.47±2.27 to -0.07±1.93 D (P=0.15). The mean (±SD) logMAR was 0.17±0.22 preoperatively and 0.14±0.14 after 6 months (P=0.9). CONCLUSIONS: Trabeculectomy induced a small but statistically significant shift in astigmatism with-the-rule after 6 months. The spherical equivalent did not change compared with the preoperative value. Most often, glasses will not need to be changed after trabeculectomy.
Department of Ophthalmology, University Hospitals Leuven, Leuven, Belgium.
Full articleClassification:
12.8.1 Without tube implant (Part of: 12 Surgical treatment > 12.8 Filtering surgery)
8.5 Other (Part of: 8 Refractive errors in relation to glaucoma)
