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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 |
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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.
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Received: 02 December 2013
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