方法：收集Orbscan检测出角膜散光在25度以内白内障患者共40例，随机分成A，B两组。在Orbscan引导下，A组20例20眼行3.2mm角膜散光轴向切口，B组20例20眼在90度轴上行3.2mm透明角膜切口，并由同一位手术医师行超声乳化白内障吸除人工晶状体植入术。观察患者术前及术后Orbscan 检测的角膜Simk值及Polar K的变化。

结果：各组内术前与术后各个时间点Polar K比较，差异有显著统计学意义； 两组之间术后各个时间点Polar K比较，差异无统计学意义，两种切口术后3mo都会增加角膜Polar K 0.3D左右。

结论：对于角膜散光25度以内白内障患者，3.2mm透明角膜切口可能引起角膜Polar K 0.3D左右散光。

METHODS: We collected 40 cases of cataract patients whose corneal astigmatism was within 25 degrees detected by Orbscan and randomly divided them into groups A, B. Detected by Orbscan, 20 patients(20 eyes)in group A was conducted with 3.2mm corneal astigmatism axial incision and 20 patients(20 eyes)in group B was conducted with 3.2mm corneal incision on 90 degrees of the axis. All cataract operations were implemented by the same physician. We observed the postoperative changes of corneal astigmatism between two groups.

RESULTS: The comparisons of Polar K on each time preoperative and postoperative point were significant differences within each group. But the comparisons of Polar K on each time preoperative and postoperative point were not statistically significant between two groups. After 3 months, two kinds of incisions would both increase about 0.3D Polar K in the cornea.

CONCLUSION: 3.2mm corneal incision may cause Polar K 0.3D in corneal astigmatism.