对１０８例临床前期急性闭角型青光眼施行了预防性虹膜周边切除术，术后观察２～１０年，手术成功率为９０％。前房角镜检查发现，可见２～４个睫状突病人眼压控制良好，可见１个睫状突或膜状组织的病人眼压控制欠佳，虹膜周边切除后切口膜闭或闭锁的眼压较高，效果较差。提示预防性虹膜周边切除术，只有切在虹膜根部，才能达到预防急性闭角型青光眼发作的目的。 108 cases of preclinical acute angle-closure glaucoma were treated with prophylactic peripheral iridotomy. The postoperative observation ranged from 2 to 10 years. The successful rate was 90%. Gonioscopic examination found that 2 to 4 ciliary processes in patients with good intraocular pressure control, we can see a ciliary process or membranous tissue in patients with poor intraocular pressure control, the iris after excision of the incision membrane or closed eye closure Higher pressure, less effective. Tip prophylactic iris resection, cut only in the iris root, in order to achieve the purpose of preventing acute angle-closure glaucoma.