传统的大切口白内障囊外摘出术常造成较大的手术源性角膜散光，影响复明效果。
The traditional large incision extracapsular cataract extraction surgery often caused a surgically induced corneal astigmatism which had great impact on fuming effect.
分析角膜散光和全眼散光的相关性以及近视程度与散光的关系。
The relation between astigmatism and the degree of myopia was also analyzed.
与传统角巩膜缘切口比较，术中眼压维持稳定，术后手术性角膜散光度数小。
Tunnel incision can make the surgery process easier and induce corneal astigmatism smaller.
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