Change of the anatomical structure of glaucoma after laser surgery

Objective To observe change of the anatomical structure of primary angle-closure glaucoma (PACG) after laser surgery by A-mode ultrasonic scanning.Methods Anatomical structures including the anterior chamber depth ( ACD),lens thickness (LT) and the axial length ( AL),were measured by A-mode ultrasonic scanning in 90 eyes of 90 patients with PACG before and after laser surgery.90 patients were randomly divided into two groups,Group A underwent Nd:YAG laser iridectomy,while group B did the combined surgery of laser iridoplasty around 360°,followed by Nd:YAG laser iridectomy.All mean values were analyzed with t-test.Results In group A,the eyes had significant differences in all items except LT compared with that before surgery (t =2.438,P ＜ 0.01 ; t =- 2.135,P ＜ 0.05 ; t =2.524,P ＜ 0.01 ).While in group B,there was a statistically significant difference in IOP and AL after surgery (t =2.517,P ＜0.01; t =2.679,P ＜ 0.01 ).The reduction of AL had positive relationship with IOP reduction (r =0.713,P ＜0.01 ).Conclusion There is a small but statistically significant decrease in AL and IOP after laser surgery.This reduction of AL was related to IOP reduction. Key words: Structure,anatomical; A-mode Ultrasonic Scanning; Glaucoma,angle-closure,Primary