目的：研究不同能量对激光虹膜周边切开术后眼压的影响。 方法：解剖学窄房角患者68例136眼行YAG激光周边虹膜切开术。记录术前眼压、术后60min眼压和术中总能量。根据总能量的百分位数，将病例分为高、中、低能量组，记录各组术后眼压升高低于5mmHg和高于5mmHg的例数。 结果：在术后眼压升高例数的比较上，低能量组与中、高能量组间有统计学差异（P<0.05），中、高能量组间无统计学差异（P>0.05）。 结论：YAG激光周边虹膜切开术，在一定范围内术中使用总能量越低，术后眼压升高风险越低。但在总能量超过44mJ时，总能量与术后眼压升高风险无明显相关性。

AIM:To observe the alteration of intraocular pressure (IOP) after laser peripheral iridotomy in different total powers. METHODS: YAG laser peripheral iridotomy were performed on 68 cases (136 eyes) with narrow angle anatomically. The IOP was taken down before the procedure and 60 minutes after the procedure,and so was the total power in the procedure.The cases were divided into 3 groups(high/middle/low power) according to the total power in the procedure,then the numbers were recorded of postoperative IOP increasing lower than 5mmHg and higher than 5mmHg in each group.  RESULTS:There was significant statistical difference among low power group and the other two groups in numbers of postoperative IOP increasing (P＜0.05). There was no significant statistical difference between the middle power group and the high power group(P＞0.05). CONCLUSION:In the cases of YAG laser peripheral iridotomy, the more lower the total power,the more lower the risk of IOP increasing after the procedue.But, there is no correlation between the total power and the risk of IOP increasing after the procedue in the case with total power above 44mJ.