The anterior chamber depth was measured with the Haag-Streit Pachymeter in 26 cases (33 eyes) of primary angle-closure glaucoma preoperatively and postoperatively on days 1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 30, 45 and 60. After successful trabeculectomy, the anterior chamber depth became shallower, particularly on days 2 to 4 postoperative, and then gradually deepened after day 5. By day 14 after surgery, the anterior chamber depth was recovered up to 91% of the preoperative level, and by day 30 up to 93%, to remain essentially stable thereafter.