超声乳化手术中平行散光轴切口对角膜散光的影响

Effect of incision parallel to corneal astigmatism axis on corneal astigmatism in phacoemulsification

目的探讨白内障超声乳化手术中平行散光轴的3．2mm切口是否可以减少角膜散光。方法收集老年性白内障313眼，术中在最大角膜屈光度子午线方向上做3．2mm切口（使切口与角膜散光轴平行），记录术前、术后1周、术后3个月角膜散光度，并进行统计学分析；根据术前不同的散光程度，按散光低中高，深入分组探讨。结果313眼术后3个月角膜散光较术前平均减少了约0．019D，差异有统计学意义（t=3．027，P=0．003）；但其中术前角膜散光较小的102眼（角膜散光〈0．5D）平均只减少了约0．015D，差异无统计学意义（t=1．225，P=-0．223）。结论3．2mm平行角膜散光轴切口能够减少角膜散光，但在术前角膜散光较小的情况下无明显效果。

Objective To investigate whether an incision parallel to corneal astigmatism axis of 3.2mm could reduce corneal astigmatism in phacoemulsification. Methods 313 eyes with age-related cataract were phacoemulsified with an incision parallel to corneal astigmatism axis. The degree of corneal astigmatism were recorded before the procedure and one week and three months after the procedure and then processed by SPSS. Results Postoperative corneal astigmatism had an average of 0.019 D reduction as compared with the baselines in 313 eyes, with a statistical significance （t = 3.027, P= 0.003） .But 102 eyes with relatively lower degree of preoperative corneal astigmatism （ 〈 0.5 D ） showed no statistical significance （ t = 1.225 , P = 0.223 ）. Conclu- sions An incision parallel to corneal astigmatism axis of 3.2 mm in phacoemulsification can reduce corneal astigmatism. But there is no statistical significance if the degree of preoperative astigmatism is relatively lower.