| Purpose:To compare postoperative visual results between Small Incision Lenticule Extraction(SMILE) and femtosecond laser in situ keratomileusis (FS-LASIK) for treating myopia.Methods:33eyes of17patients with mean spherical equivalent (SE) of-4.81±1.47D who underwent SMILE were matched to37eyes of23patients with mean SE of-5.56±2.08D treated by FS-LASIK. There were no significant differences between the2groups in manifest refraction, best corrected distance visual acuity (BCVA), pupil diameter, higher-order aberrations (HOAs) and contrast sensitivity (CS) preoperatively. And, visual acuity, manifest refraction, HOAs and CS were analyzed at1and3months postoperatively.Results:At1month, UCVA in SMILE group was-0.010±0.06logMAR and in FS-LASIK group0.001±0.07logMAR (p=0.534); BCVA in SMILE group was0.002±0.03logMAR and in FS-LASIK groups0.000±0.02logMAR (p=0.731);The mean SE in SMILE group (-0.05±0.29D) was lower than that in FS-LASIK group (0.12±0.32D)(p=0.022); There was no significant defference between the2groups in predictability (p=0.591);Both groups significantly increased in the mean root mean square (RMS) of total HO As, spherical aberration (SA) and Coma1month after surgery, FS-LASIK had a statistically significantly greater increase in total RMS HOAs (p=0.011) and induced more SA (p<0.001) than SMILE; Significant reduction in CS were found in SMILE at2.6,4.2cpd without glare and at all spatial frequencies in FS-LASIK at1month, SMILE had a better CS than FS-LASIK at1.0cpd (p=0.014),1.7cpd (p=0.010),4.2cpd (p=0.019) without glare and2.6cpd (p=0.006),4.2cpd (p=0.011),6.6cpd (p=0.044) with glare. At3months, UCVA in SMILE group was-0.022±0.10logMAR and in FS-LASIK group-0.026±0.06logMAR (p=0.827); BCVA in both groups was0.000logMAR; The mean SE in SMILE group was-0.05±0.39D and in FS-LASIK group0.00±0.27D (p=0.022); FS-LASIK had a better predictability than SMILE (p=0.011); Both groups significantly increased in total RMS HOAs, SA and Coma3months after surgery, FS-LASIK had a statistically significantly greater increase in total RMS HOAs (p=0.017) and more induced SA (p<0.001) than SMILE; Significant reduction in CS was found in SMILE at2.6,4.2cpd without glare and4.2cpd with glare and at all spatial frequencies except1.7cpd with glare in FS-LASIK, SMILE had a better CS than FS-LASIK at1.7cpd (p=0.047),4.2cpd (p=0.019) without glare and1.7cpd (p=0.035) with glare.Conclusions:Both SMILE and FS-LASIK is safe and effective for treating myopia and astigmatism. FS-LASIK has a better predictability. SMILE induces less HOAs especially SA compared to FS-LASIK postoperatively, and the reductions in CS are significantly lower in SMILE than that in FS-LASIK at low and moderate spatial frequencies postoperatively. SMILE performs better visual quality than FS-LASIK. |
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