Abstract
BackgroundSmall incision lenticule extraction (SMILE) and femtosecond laser-assisted in situ keratomileusis (FS-LASIK) are frequently used to treat myopia. However, little is known about the impact on recovery of these approaches in the very early postsurgical phase (within 24 h).MethodsTo compare the efficacy of these two procedures for the treatment of myopia in the early phase after surgery, differences in visual acuity, OSI (objective scattering index), cutoff for modulation transfer function (MTF), and SR (Strehl ratio) between SMILE and FS-LASIK were evaluated at 0, 2, 4 and 24 h postoperatively using two-way analysis of variance (ANOVA).ResultsNo significant differences between SMILE and FS-LASIK in the MTF cutoff and SR were found (p > 0.05). However, at 2 h and 4 h after surgery, OSI values in the SMILE group were significantly higher than those in the FS-LASIK group, and visual acuity scores in the SMILE group were significantly poorer than those in the FS-LASIK group (p < 0.05). Regarding subjective symptoms, the number of patients complaining of eye dryness, blurred vision, foreign body sensation and eye soreness in the SMILE group were lower than the number in the FS-LASIK group.ConclusionsIn conclusion, visual and optical quality outcomes of FS-LASIK for myopia were better than those of SMILE in the very early phase after surgery, a difference that is attributable to the formation of interface haze.Trial registrationChiCTR1900021451.
Highlights
Small incision lenticule extraction (SMILE) and femtosecond laser-assisted in situ keratomileusis (FSLASIK) are frequently used to treat myopia
Currently, small incision lenticule extraction (SMILE) procedure and femtosecond laser-assisted in situ keratomileusis (FS-LASIK) are two popular techniques used in the clinical treatment of myopia and myopic astigmatism [1,2,3,4]
There were no significant differences between the two groups in corrected distance visual acuity (CDVA), spherical equivalent (SE), central corneal thickness (CCT) and intraocular pressure (IOP)
Summary
Small incision lenticule extraction (SMILE) and femtosecond laser-assisted in situ keratomileusis (FSLASIK) are frequently used to treat myopia. Small incision lenticule extraction (SMILE) procedure and femtosecond laser-assisted in situ keratomileusis (FS-LASIK) are two popular techniques used in the clinical treatment of myopia and myopic astigmatism [1,2,3,4]. Compared with LASIK, it has been postulated that a longer period of time is required for visual recovery when using SMILE. Both SMILE and FS-LASIK are safe and effective, with predictable clinical parameters during months of follow-up [9], little is known about the clinical parameters in the very early stage of recovery (within 24 h) in patients who have undergone these procedures
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