Optical quality after SMILE and FS-LASIK for high myopia was
A Study was conducted to compare the correction effect and optical quality after small-incision lenticule extraction (SMILE) and femtosecond laser assisted laser in situ keratomileusis (FS-LASIK) for high myopia.

51 high myopia eyes after SMILE and 49 high myopia eyes after FS-LASIK were enrolled and divided into two groups retrospectively. The OQAS and iTrace analyzer were used for optical quality inspection. Between the two groups the spherical equivalent (SE), astigmatism, uncorrected distant visual acuity (UDVA), strehl ratio (SR), modulation transfer function cutoff frequency (MTF cutoff), objective scatter index (OSI) and wavefront aberrations were analyzed and compared before surgery and at 1, 6 and 12 months after surgery.

Results:
--After the operation:
(1) SE and astigmatism declined and UDVA increased significantly in both groups, and UDVA was better after SMILE than FS-LASIK
(2) SR and MTF cutoff reduced and OSI increased significantly after SMILE and FS-LASIK. SR and MTF cutoff were significantly higher after SMILE than FS-LASIK. OSI was significantly lower after SMILE than FS-LASIK
(3) The total wavefront aberration, total low-order wavefront aberration, defocus and astigmatism aberration as well as trefoil aberration reduced significantly in both groups.

--The total high-order wavefront aberration increased significantly after FS-LASIK.

--The spherical and coma aberration increased significantly in both groups.

--The total high-order wavefront aberration and coma aberration at 1 month were higher after FS-LASIK than SMILE.

Particularly after SMILE and FS-LASIK, the optical quality declined. SMILE outperformed FS-LASIK in terms of corrective effect and optical quality for high myopia. The combination of OQAS and the iTrace analyzer is a valuable supplemental assessment in assessing optical quality following refractive surgery.

Source: https://bmcophthalmol.biomedcentral.com/articles/10.1186/s12886-021-02048-5
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