方法：年龄相关性白内障患者160例168眼，年龄50～83岁，晶状体混浊分级为Ⅱ～Ⅴ级，随机分为两组，每组84眼，分别行1.8mm同轴微切口(微切口组)和传统3.2mm小切口(常规组)白内障超声乳化手术，术后第1d； 1wk； 1mo观察随访，记录裸眼视力及散光改变，采用χ²检验和t检验对所得数据进行分析。

结果：术后第1d； 1wk； 1mo微切口组裸眼视力≥0.5者分别占79%，83%，94%，常规组裸眼视力≥0.5者分别占46%，64%，85%，两组差异有统计学意义(P<0.05)； 术后第1d，微切口组平均角膜散光为0.75±0.45D，常规组角膜散光为1.12±0.55D，两组比较有显著性差异(P<0.01)，术后1wk和1mo，微切口组平均角膜散光分别为0.76±0.40D和0.65±0.35D，常规组平均角膜散光为1.05±0.53D和0.85±0.43D，两组比较有统计学意义(P<0.05)。

结论：1.8mm同轴微切口白内障超声乳化术较常规超声乳化术，术源性角膜散光更小，术后视力恢复更快。

METHODS: Totally 160 patients(168 eyes)with age-related cataract were selected, whose age from 50 to 83 years old. Their lens opacities classification was Ⅱ-Ⅴ grade. Two groups were divided randomly and each group included 84 eyes. They performed 1.8mm coaxial micro-incision(micro-vision group)and traditional 3.2mm small incision(control group)of cataract phacoemulsification respectively. After 1d, 1wk, 1mo follow-up, their naked vision and astigmatism changes were recorded. The χ²-test and t-test was used for the statistical analysis.

RESULTS: After 1d, 1wk, 1mo of the micro-incision surgery, naked vision ≥0.5 of the patients were 79%, 83% and 94% respectively. In control group, naked vision ≥0.5 were 46%, 64% and 85% respecticvely. There was significant difference between the two groups(P<0.05). The average corneal astigmatism of micro-incision group was 0.75±0.45D on 1d after surgery, and that of the control group was 1.12±0.55D. There were significant difference between two groups(P<0.01). After 1wk and 1mo, the average corneal astigmatism of micro incision group was 0.76±0.40D and 0.65±0.35D, and the average corneal astigmatism of control group was 1.05±0.53D and 0.85±0.43D. The two groups were statistically significant(P<0.05).

CONCUSION: The corneal astigmatism of 1.8mm coaxial micro-incision cataract phacoemulsification was smaller than that of the conventional phacoemulsification and visual recovery was also better after surgery.