AIM: To study the etiology of high intraocular pressure(IOP)after trabeculectomy.

METHODS:Clinical data of 30 patients 34 eyes including the first time preoperative, intraoperative and postoperative situation were recorded, and when high IOP occurred, ophthalmic specialized examination(intraocular pressure, vision, angle of anterior chamber, etc)and UBM was perfoemed to analyze the cause of high IOP after trabeculectomy from September, 2009 to December, 2010.

RESULTS:The cause of high IOP after trabeculectomy included: filtering bleb flat scarring in 12 cases 15 eyes; malignant glaucoma tendency in 5 cases 6 eyes; postoperative bleeding anterior chamber 3 cases 3 eyes; sclera disc incision unobstructed 2 cases 2 eyes; Preoperative high IOP lasted for a long time in 2 cases 2 eyes; encapsulated filtering bleb in 2 cases 2 eyes; Other reasons such as preoperative uveitis in 1 case 1 eye; postoperative intumescent cataract in 1 case 1 eye; poor operation in 1 case 1 eye and surgery way not chosen wisely in 1 case 1 eye.

CONCLUSION: The main reason for high intraocular pressure after trabeculectomy is the postoperative filtering bleb flat scarring.