方法：利用回顾性研究方法观察2014年1月1日至2014年12月31日行白内障手术患者的术前角膜散光分布规律(利用IOL Master测量)。通过描述性方法分析角膜散光数据。

结果：研究包含3 821名患者(平均年龄为66.36 ±10.38岁)4 543眼。角膜散光<0.5D占10.50%，0.5D～1.0D占30.05%，1.0D～1.5D占23.60%，1.5D～2.0D占13.19%，2.0～2.5D占7.68%，2.5～3.0D占6.41%，>3.0D占8.58%。其中27.69%为顺规散光，53.84%为逆规散光。

结论：约59.46%患者的角膜散光≥1.0D。观察结果提示在白内障手术中，需要一些具有矫正散光功能的人工晶状体或特殊的手术技巧来矫正角膜散光，以保证患者术后视觉质量。

METHODS:A retrospective survey was used to study the corneal astigmatism which were measured by intraocular lens(IOL)Master optical biometer before cataract surgery between Jan. 1^st, 2014 and Dec. 31^st, 2014. Descriptive statistics of corneal astigmatism data were analyzed.

RESULTS:The keratometric data from 4 543 eyes from 3 821 patients with a mean age of 66.36±10.38y(SD). In 10.50% of eyes, corneal astigmatism was between 0.5 diopters(D)or less; in 30.05% of eyes, it was 0.5-1.0 D; in 23.60%, it was 1.0-1.5 D; in 13.19%, it was 1.5-2.0 D; in 7.68%, it was 2.0-2.5 D; in 6.41%, it was 2.5-3.0 D; in 8.58%, it was 3.0 D or higher. With-the-rule astigmatism was found in 27.69% of eyes, while against-the-rule was found in 53.84% of eyes.

CONCLUSION:About 59.46% of eyes in this study had preoperative corneal astigmatism equal to or above 1.0 D. Findings indicated more surgical techniques or toric intraocular lenses to meet the potential demand of the cataract surgery candidates.