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Randomized Controlled Trial
. 2018 Nov;66(11):1562-1567.
doi: 10.4103/ijo.IJO_366_18.

Comparison of changes in refractive error and corneal curvature following small-incision lenticule extraction and femtosecond laser-assisted in situ keratomileusis surgery

Ya L Zhang  1 , Li J Cao  1 , Hong W Chen  1 , Xiang H Xu  1 , Zhao N Li  1 , Lei Liu  1
Affiliations
Randomized Controlled Trial

Comparison of changes in refractive error and corneal curvature following small-incision lenticule extraction and femtosecond laser-assisted in situ keratomileusis surgery

Ya L Zhang et al. Indian J Ophthalmol. 2018 Nov.

Abstract

Purpose: To compare visual acuity, refractive error, corneal curvature, and the stability of these parameters during the early postoperative period following small-incision lenticule extraction (SMILE) and femtosecond laser-assisted in situ keratomileusis (FS-LASIK) surgery.

Methods: One hundred and five eyes and 110 eyes were enrolled in SMILE and FS-LASIK group, respectively. Uncorrected and best-corrected distance visual acuity (UCVA and BCVA), manifest refraction, corneal curvature, intraocular pressure, and slit-lamp examinations were performed preoperatively, 1 day, 1 week, 1 month, and 3 months postoperatively.

Results: No significant differences in postoperative UCVA or BCVA were observed between the SMILE and FS-LASIK groups at any time point. SMILE group had significant better postoperative spherical equivalent (SE) values than FS-LASIK group at 1 day, 1 week, and 1-month follow-up. However, there was no significant difference in postoperative SE values at 3-month follow-up. Significant differences in mean postoperative corneal curvature were observed during all follow-up examinations.

Conclusion: SMILE surgery was associated with more accurate postoperative refractive correction up to 1 month following surgery. SMILE surgery also resulted in less significant corneal curvature changes than FS-LASIK. Furthermore, FS-LASIK was associated with decreased stability of postoperative refractive error and corneal curvature relative to SMILE.

Keywords: Corneal curvature; femtosecond laser; laser in situ keratomileusis; refractive error; small-incision lenticule extraction.

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Conflict of interest statement

There are no conflicts of interest

Figures

Figure 1
Figure 1
Comparison of preoperative and postoperative spherical equivalent values in the SMILE and FS-LASIK groups
Figure 2
Figure 2
Comparison of preoperative and postoperative corneal curvature values in the SMILE and FS-LASIK groups
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