Authors: Zhang Li, Zhai Changbin, Zhou Yuehua, Qi Ying, Zhang Jing, Zheng Yan, Liu Qian
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Objective
To compare the visual quality after topography-guided customized femtosecond laser-assisted in situ keratomileusis (FS-LASIK) and wavefront-optimized FS-LASIK treatment in myopic eyes.
Methods
A non-randomized controlled clinical study was performed.Seventy-eight eyes of 39 myopic patients undergoing FS-LASIK in Beijing Tongren Hospital from October 2016 to February 2017 were enrolled in this study and divided into two groups according to each patient’s opinion, with matched demography between the two groups.Topography-guided customized FS-LASIK was performed on 42 eyes of 21 myopia in the topography-guided group, and wavefront-optimized FS-LASIK was performed on 36 eyes of 18 patients in the wavefront-optimized group.Visual acuity, refractive error, higher order aberrations (HOAs) and contrast sensitivity(CS) were compared between the two groups before and 6 months after surgery.Written informed consent was obtained from each patient before the operation.This study protocol was approved by Ethic Committee of Beijing Tongren Hospital (No.TRECKY2014-026).
Results
The postoperative uncorrected visual acuity (UCVA) levels were eaqual to or better than the preoperative best corrected visual acuity (BCVA) in 95.2% patients in the topography-guided group, and in 94.4% patients in the wavefront-optimized group 6 months after surgery, respectively.There were no significant differences in the spherical equivalent, sphere refraction and cylinder refraction between the two groups (all at P>0.05). The amount of induced coma was significantly lower in the topography-guided group than that in the wavefront-optimized group ([0.07±0.22]μm vs.[0.22±0.16]μm) at 6 mm pupil.LogCS improved under the 12.0 c/d in the background of mesopic in the topography-guided group and decreased under the 18.0 c/d both in the background of mesopic and mesopic + glare in the wavefront-optimized group 6 months after surgery, with signifcant differences between them (all at P<0.05). LogCS values under 6.0, 12.0 and 18.0 c/d in the background of mesopic and 18.0 c/d in the background of mesopic+ glare in the topography-guided group were significantly higher than those in the wavefront-optimized group 6 months after surgery, with significant differences between the two groups (all at P<0.05).
Conclusions
Topography-guided FS-LASIK has lower higher-order aberrations and better CS than wavefront-optimized FS-LASIK.