观察23G与20G玻璃体切割手术系统对晶状体损伤的情况。 方法：对2009-08/2010-07在我院行20G或23G有晶状体眼玻璃体切割手术患者共91例95眼进行分析。A组46例48眼行20G玻璃体切割手术，B组45例47眼行23G玻璃体切割手术，采用吊顶灯技术。术中根据病情需要进行剥膜、视网膜切开、视网膜脱离复位、异物取出、视网膜激光光凝、气液交换、玻璃体腔气体/硅油填充等步骤，对术中晶状体损伤情况进行观察。 结果：20G玻璃体切割手术组18例18眼发生晶状体混浊, 23G玻璃体切割手术组5例5眼发生晶状体混浊。两组均未见切割头咬伤晶状体。 结论：23G手术与20G手术相比，因可以在术中灵活更换灌注套管位置，减少因器械伸入行程过长、进行对侧基底部玻璃体切割时造成的晶状体损伤。

To observe the damage of 23-Gauge and 20-Gauge vitrectomy system to lens. METHODS:Between August 2009 and July 2010, 95 eyes of 91 patients suffered vitrectomy surgery.All paients were phakic. Group A contained 48 eyes of 46 patients who underwent 20-Gauge vitrectomy system.Group B contained 47 eyes of 45 patients who underwent 23-Gauge vitrectomy system. Ceiling lamp was used in 23-Gauge vitrectomy system.Epiretinal membranes peeled,retinotomy, retinal detachment attached, foreign bodies removed, retinal laser photocoagulation, air-fluid exchange, gas or/and silicone oil tamponaded and other steps were taken as needed. Whether the lenses would be damaged in the surgery was observed. RESULTS:In 20G vitrectomy group, 18 eyes had lens damaged while in 23G vitrectomy group, 5 eyes had lenses damaged,P＜0.01. CONCLUSION:23-Gauge vitrectomy system can change the tube position flexibly if necessary,reducing the damage caused by the devices during the opposite base vitreous body vitrectomy.