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目的 探讨双向线性控制超声能量和负压的技术对提高白内障超声乳化效果和减少手术并发症的作用.方法 应用双向线性控制能量和负压技术对不同核硬度白内障行超声乳化手术,和单向线性控制能量和负压技术比较,分析两组超声相对能量复合参数、手术并发症和术后角膜水肿程度.结果 Ⅲ级核和Ⅳ级核的超声相对能量复合参数,双向组低于单向组(P＜0.05),而Ⅰ～Ⅱ级核者,两组间无显著差异(P＞0.05).双向组术中并发症及术后角膜水肿情况均低于单向组(P＜0.05).结论 双向线性超声乳化技术可以在任何负压下应用超声能量,对于较硬核白内障是一项高效、安全的白内障超声乳化技术.“,”Objective To study the effect of dual linear control energy and vaccum technique to raise phacoemulsification efficiency and reduce complications. Methods Phacoemulsification by dual linear controlled energy and negative pressure were performed on 116 cataract cases with different hardness lens nuclei. The ultrasonic relative energy complex parameters, complications and corneal edema were compared between dual linear group and single linear group. Results The accumulate energy complex parameter for hard nuclear cataract ( scale Ⅲ and Ⅳ ) in dual linear group was significantly less than those in single linear group,but there was no significant difference in soft nucleus cataract ( scale Ⅰ and Ⅱ ). The perioperative complications and postoperative corneal edema in dual linear group were significantly less than those in single linear group. Conclusions Phaco energy can be used at any vacuum condition in the process of phacoemulsification by dual linear technique. It is a high effective and safe phacoemulsification technique.