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目的 比较 3种不同长度巩膜隧道外切口超声乳化白内障吸除术后产生手术源性散光(surgicallyinducedastigmatism ,SIA)度数及方向的变化规律 ,并评价手术效果。方法 将 10 4例 ( 10 4只眼 )白内障患者分为A、B、C 3组 ,分别以 3 2、5 5及 7 0mm巩膜隧道外切口施行超声乳化白内障吸除术。测量术前、术后 1周、1、3和 6个月的角膜曲率 ,运用Cravy向量分析法计算SIA度数及方向 ,比较 3组术后不同时间的平均SIA度数及裸眼视力。结果 平均SIA度数和裸眼视力 ,术后 1周A组明显优于B、C组 (P <0 0 5 ) ;术后 1、3和 6个月 3组比较 ,差异无显著性 (P >0 0 5 ) ;术后各随访时间B、C两组比较 ,差异均无显著性 (P >0 0 5 )。结论 以 3 2mm外切口行超声乳化白内障吸除术后SIA度数小而稳定 ,早期可获得良好而稳定的裸眼视力
Objective To compare the changes of degree and direction of surgically induced astigmatism (SIA) after phacoemulsification with three kinds of scleral tunnel incisions with different lengths and to evaluate the effect of surgery. Methods A total of 104 patients (104 eyes) with cataract were divided into three groups: A, B and C, respectively. Phacoemulsification and cataract surgery were performed with 3 25 5 and 70 mm scleral tunnel incisions respectively. The corneal curvature was measured preoperatively, 1 week, 1, 3, and 6 months after operation. The SIA and direction were calculated by Cravy vector analysis. The average SIA and uncorrected visual acuity were compared between the three groups at different time points. Results The mean SIA and uncorrected visual acuity were significantly higher in group A than those in group B and C at 1 week after operation (P <0 05). There was no significant difference between group 1 and 3 at 6 months after operation There was no significant difference between groups B and C at each follow-up time (P> 0.05). Conclusions The SIA degree after phacoemulsification with 32mm external incision is small and stable, and good and stable uncorrected visual acuity can be obtained in the early stage