白内障超声乳化术中切口位置对角膜散光影响的观察

目的比较白内障超声乳化术中不同位置的切口对角膜散光的影响。方法53例（70只眼）施行超声乳化联合PMMA人工晶状体植入的白内障患者随机分为两组各35只眼：A组（实验组）根据角膜散光情况选择切口位置，顺规散光（WRA）及斜轴散光（OA）于最大曲率子午线上、逆规散光（ARA）于120°（右眼）或60°（左眼）轴向上、无散光者于颞上方；B组（对照组）切口位置始终选择在颞上方，均采用5．5mm巩膜隧道切口，切口术后不缝合。观察术前及术后3d、1个月、3个月的视力及角膜散光状态。结果A组术后3个月平均角膜散光度较术前减少0．3D（t=2．664，P〈0．01），B组术后3个月平均角膜散光度与术前比较增加约0．48D（t=4．559，P〈0．01），两者与术前相比较均有显著差异。结论白内障超声乳化术选择在角膜最大曲率子午线上做切口，可以矫正一定的术前散光。

The effect of incision position in phacoemulsification on corneal astigmatism

Objective To compare the effect of different incision position in phaccemulaifion on corneal astigmatism. Methods 53 patients （70 eyes ） who underwent phaccemulsification and intraecular lens implantation （PMMA ） were randomly divided into two groups ：group A （incision at the maximum curvature meridian for with-the rule astigmatism and oblique astigmatism,at the axial diretion of 60°（left eye） or 120° （right eye） for against-the rule astigmatism,at the temporal anedic for no astigmatism） and group B （ incision at the temporal anedic ignoring the astigmatism axis ） , using a scleral tunnel incision without suture. Corneal astigmatism was detected preoperatively and 3 days, 1 month postoperatively. Result The corneal astigmatism changes between pre-and postoperative were 0.3D , 0.48D in group A and group B. Conclusion The choice of incision location has an influence on the correction of corneal astigmatism.