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目的 比较经透明角膜与角巩膜隧道切口的白内障超声乳化吸除、PMMA晶体植入术后手术源性散光 (surgicallyinducedastigmatism ,SIA)度数及其变化规律 ,并评价其手术效果。方法 在上方角膜缘或透明角膜缘处作 5.0mm梯形隧道切口 ,将 566例 ( 566只眼 )白内障分成A、B两组 ,行超声乳化吸除并植入人工晶体 ,测量术后 1周、1个月、3个月和 6个月的角膜曲率 ,计算SIA度数及其方向 ,比较两组术后不同时间的平均SIA度数及结果。结果 平均SIA度数和裸眼视力 ,术后 1个月、3个月和 6个月两组比较 ,差异无显著性 (P >0 .0 5) ;术后并发症B组明显高于A组 (P <0 .0 5)。结论 以 5.0mm角膜隧道切口行超声乳化白内障吸除后SIA度数小且稳定 ,早期可获得良好而稳定的裸眼视力 ;而透明角膜切口手术便捷 ,术后 1个月散光与角巩膜切口基本相似且稳定 ,可获得与角膜隧道切口几乎同样的手术效果
Objective To compare the degree of surgically induced astigmatism (SIA) and the change of phacoemulsification after phacoemulsification with phacoemulsification through corneal and scleral tunnel incision. The surgical results were evaluated. Methods 5.0 mm trapezoidal tunnel incision was made in the upper corneal limbus or clear corneal limbus. 566 cases (566 eyes) of cataract were divided into A group and B group. The intraocular lens was removed by phacoemulsification and intraocular lens implantation was performed. One week after operation, 1 month, 3 months and 6 months of corneal curvature, calculate the SIA and its orientation, the average SIA scores and the results at different time points after the two groups were compared. Results The average SIA and uncorrected visual acuity were not significantly different between the two groups at 1 month, 3 months and 6 months after operation (P> 0.05). The postoperative complications in group B were significantly higher than those in group A P <0. 05). Conclusion 5.0 mm corneal tunnel incision phacoemulsification cataract surgery SIA small and stable, good early and stable visual acuity; and clear corneal incision operation convenient, 1 month after surgery and corneal scleral incision basically the same and Stable with almost the same surgical results as corneal tunnel incisions