Abstract
BackgroundTo compare the changes in the anterior segment after femtosecond laser in situ keratomileusis (FS-LASIK) and small incision lenticule extraction (SMILE) using a dual rotating Scheimpflug (DRS) analyzer (Galilei®; Ziemer Ophthalmology, Port, Switzerland).MethodsA total of 218 eyes of 109 patients who underwent FS-LASIK or SMILE for myopic correction were retrospectively studied. Ninety-eight eyes of 49 patients who underwent FS-LASIK were compared to 120 eyes of 60 patients treated with SMILE. A DRS analyzer was used for preoperative and 6-month postoperative anterior segment analyses. Measured variables included the central corneal thickness (CCT), anterior chamber depth (ACD), anterior and posterior keratometry (K), anterior and posterior best-fit sphere radius, and maximum posterior elevation (MPE).ResultsAfter the procedure, the amount of CCT decrease was higher in the SMILE group than in the FS-LASIK group, but it was not statistically significant. The MPE was significantly increased after both procedures (p < 0.001 and p = 0.001 in the FS-LASIK and SMILE groups, respectively), with the amount of elevation being higher after FS-LASIK than after SMILE even though it was not statistically significant. And there was a significant change in the steep and average posterior K in the FS-LASIK group (p = 0.006 and 0.001, respectively), but not in the SMILE group.ConclusionsRegarding changes in the MPE and posterior K, changes in the posterior corneal surface were greater after FS-LASIK than after SMILE.Trial registrationThe trial registration number: KCT0003628. Date of registration: 15 March 2019.
Highlights
To compare the changes in the anterior segment after femtosecond laser in situ keratomileusis (FSLASIK) and small incision lenticule extraction (SMILE) using a dual rotating Scheimpflug (DRS) analyzer (Galilei®; Ziemer Ophthalmology, Port, Switzerland)
We observed a statistically significant increase in the negative power of the posterior cornea after FSLASIK compared to the preoperative results, with no significant change seen after SMILE
Using the DRS analyzer, we investigated differences between the results of FS-Laser in situ keratomileusis (LASIK) and SMILE and found a significant change in the maximum posterior elevation (MPE) after both procedures, with the amount of elevation being higher after FSLASIK than after SMILE even though it was not statistically significant
Summary
To compare the changes in the anterior segment after femtosecond laser in situ keratomileusis (FSLASIK) and small incision lenticule extraction (SMILE) using a dual rotating Scheimpflug (DRS) analyzer (Galilei®; Ziemer Ophthalmology, Port, Switzerland). Small incision lenticule extraction (SMILE) is a relatively new technique for correcting myopia and myopic astigmatism, involving cutting of the intrastromal lenticule using a femtosecond (FS) laser, followed by manual extraction through a peripheral corneal tunnel incision [3]. This procedure is widely used because of its good predictability, safety, and patient satisfaction [4, 5]. Kim et al BMC Ophthalmology (2019) 19:251 the DRS analyzer provides anterior segment measurements with good repeatability and reproducibility for both normal and postrefractive surgery corneas [11]
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