【摘要】 目的 研究飞秒激光制瓣LASIK(飞秒LASIK)联合波前优化治疗近视及散光术后角膜像差的特性。方法 回顾性研究。行飞秒LASIK手术的近视及近视散光患者30例(30眼),平均年龄(20.9±2.8)岁;术前平均等效球镜度(-6.48±1.61)D。应用Pentacam眼前节分析仪测量角膜前表面6、7、8、9 mm直径下的Q值,采用Keratron角膜波前像差分析仪测量6 mm瞳孔直径下角膜波前像差。随访时间为术后3个月,手术前后数据采用配对t检验,采用Pearson相关分析角膜像差、Q值与其他参数的相关性。结果 6 mm瞳孔直径下角膜高阶像差、总球差、总彗差、水平彗差、垂直彗差、初级球差、x-向次级像散、次级水平彗差、次级垂直彗差、次级球差均较术前增加,差异有统计学意义(t=-8.254、 -7.385、 -6.108、 -5.651、 -2.195、 -7.565、 -4.628、 -2.974、 -2.748、 -7.068,P<0.05)。角膜前表面4个直径范围内Q值均较术前增加,差异有统计学意义(t=16.999、-19.208、-21.502、-22.197,P<0.05)。6 mm瞳孔直径下手术前后Q值变化量(△Q6 mm)与高阶像差变化量、总球差变化量、初级球差变化量、总彗差变化量呈正相关(r=0.736、0.792、0.788、0.383,P<0.05),△Q6 mm与总三叶草变化量、次级球差变化量无相关性(r=0.099、-0.348,P>0.05)。结论 飞秒LASIK联合波前优化治疗近视及近视散光是安全、有效的,但术后角膜高阶像差仍有显著增加。
【关键词】 飞秒激光; 角膜磨镶术,激光原位; 像差; 波前优化; 近视
DOI:10.3760/cma.j.issn.1674-845X.2014.04.002
基金项目:国家自然科学基金(81170873)
作者单位:300020 天津医院 眼科临床学院 天津学与视觉科学重点实验室
通信作者:王雁,Email:wangyan7143@vip.sina.com
Corneal aberrations after femtosecond LASIK for myopia and myopia astigmatism with a wavefront optimized profile Wang Lu, Wang Yan, Zuo Tong, Geng Weili, Jin Ying, Zu Peipei, Zhang Hui. Tianjin Eye Hospital, Tianjin Key Lab of Ophthalmology and Visual Science, Tianjin Eye Institute, Clinical College of Ophthalmology, Tianjin Medical University, Tianjin 300020, China
Corresponding author:Wang Yan,Email:wangyan7143@vip.sina.com
【Abstract】 Objective To evaluate the corneal aberrations after femtosecond LASIK for myopia and myopia astigmatism with a wavefront optimized profile. Methods Prospective study including 30 eyes from 30 patients (mean 20.9±2.8 years) with myopia (mean spherical equivalent refractive -6.48±1.61 D). The asphericity (Q value) of the anterior corneal surface for patients with different corneal diameters (6, 7, 8 and 9 mm) were measured with Pentacam. Higher-order aberrations (HOAs) of the corneal were measured with the Keratron at 6 mm pupil diameter. Postoperative changes in corneal HOAs and corneal asphericity were analyzed during 3 months follow up. Paired t test was used to analysis the pre- and post-operative data. Pearson correlation was used to investigate correlations between Q values, corneal aberrations and other data. Results At 6 mm pupil diameter significant increases in corneal HOAs, whole spherical aberration (WSA), whole coma (WComa), C3+1, C3-1, C40、 C4+2, C5+1, C5-1, C60 were observed 3 months after surgery (t=-8.254, -7.385, -6.108, -5.651, -2.195, -7.565, -4.628, -2.974, -2.748, -7.068, P<0.05). Corneal asphericity for 6, 7, 8, 9 mm also increased significantly (t=16.999, -19.208, -21.502, -22.197, P<0.05). At 6 mm pupil diameter significant correlations were found between Q change(△Q6 mm) and HOA change (△HOA), WSA change (△WSA), C40 change (△C40), WCom change (△WComa) (r=0.736, 0.792, 0.788, 0.383, P<0.05). No correlation between △Q6 mm and whole trefoil change (△WTrefoil), C60 change (△C60) (r=0.099, -0.348, P>0.05). Conclusion Femtosecond LASIK using a wavefront optimized ablation profile yielded excellent visual outcomes. A significant induction of corneal HOAs still exists.
【Key words】 Femtosecond laser; Keratomileusis,laser in situ; Aberration; Wavefront optimized; Myopia