目的：比较MyoRing植入前后圆锥角膜(KCN)患者角膜前后表面散光和全屈光散光。

方法：历史队列研究。比较植入360度全环植入物(MyoRing)的KCN患者的术前和术后全屈光、角膜前后表面散光，术后3、6、9、12 mo连续随访四次。

结果：共纳入KCN患者79例85眼，其中男43例，女36例，平均年龄29±7.41(17-48)岁。随访期间，全屈光散光、角膜前后表面散光呈减少趋势。MyoRing植入后12 mo，总屈光散光测量值显著下降2.09 D(4.27±3.15 vs 2.18±1.63 D，P<0.001)。此外，术后测量显示，角膜前表面和后表面散光分别改善约3.20 D和0.59 D\〖6.40±1.90 vs 3.20±1.75 D(P<0.001)和1.30±0.55 vs 0.71±0.35(P<0.001)\〗

结论：MyoRing植入可显著改善散光参数，包括全屈光散光以及角膜前后表面散光。

METHODS: In this historical cohort study, the preoperative and postoperative total refractive, anterior and posterior corneal astigmatism of KCN patients implanted with a 360-degree full-ring implant(MyoRing)were compared before and after four consecutive follow-up sessions at 3, 6, 9, and 12 mo after surgery.

RESULTS: The study encompassed 79 KCN patients(85 eyes), comprising 43 males and 36 females. The mean age of the patients was 29±7.41 years, ranging from 17 to 48 years. Throughout the follow-up sessions, a gradual decrease was observed in the trend of changes for total refractive astigmatism, anterior corneal astigmatism, and posterior corneal astigmatism. Postoperatively, total refractive astigmatism measurements exhibited a significant decrease of 2.09 D at 12 mo after MyoRing implantation(4.27±3.15 vs 2.18±1.63 D, P<0.001). Additionally, post-operative measurements revealed an enhancement of approximately 3.20 D and 0.59 D for anterior and posterior corneal astigmatism, respectively \〖6.40±1.90 vs 3.20±1.75 D for anterior corneal astigmatism(P<0.001)and 1.30±0.55 vs 0.71±0.35 D for posterior corneal astigmatism(P<0.001)\〗.

CONCLUSION: MyoRing implantation demonstrates significant improvements in astigmatism parameters, encompassing total refractive astigmatism as well as anterior and posterior corneal astigmatism.