Effect of Suction on the Retinal Superficial Vascular Networks's Flow Density after SMILE and FS-LASIK in High Myopia Using Optical Coherence Tomography Angiography
Yu Li, Wenli Yang, Fengju Zhang
Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Ophthalmology & Visual Sciences Key Lab, Beijing 100730, China
To compare the effect of suction on the retinal superficial vascular networks's flow density, macular retinal thickness, and retinal nerve fiber layer thickness during small incision lenticule extraction (SMILE) and femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK) surgery using optical coherence tomagraphy angiography (OCTA). Methods: This was prospective, non-randomized, controlled study. From November 2017 to March 2018, 45 patients with a binocular spherical equivalent (SE) <-6.00 Dwere treated at the same refractive surgery center of Beijing Tongren Hospital. The study included 22 patients (22 eyes) who had undergone FS-LASIK and 23 patients (23 eyes) who had undergone SMILE surgery, and the SE was -8.10±1.20 D, and -7.34±1.90 D, respectively. Besides the routine examinations, all patients were examined with OCTA by the same operator. OCTA was performed at 1 week, 1 month and 3 months after surgery. Repeated measures analysis of variance and independent sample t-tests were used to analyze and compare the collected data from the two surgical groups. Results: All patients had uncorrected and best corrected visual acuity assessed preoperatively. The FS-LASIK and SMILE groups had SE values of 0.14±0.82 D and -0.23±0.56 D, respectively, at 3 months postoperatively. The difference was not statistically significant (t=1.696, P=0.098). There were no significant differences in the preoperative retinal superficial vascular networks's flow density, macular retinal thickness, and retinal nerve fiber layer thickness between the FS-LASIK group and SMILE group (all P>0.05), and there were no statistical differences between the follow-up times at 1 week, 1 month and 3 months after surgery in each group (all P>0.05). Conclusions: The suction during SMILE and FS-LASIK surgery has no effect on the microstructural parameters of the fundus in high myopic eyes. It is safe and feasible to choose either surgical methods for high myopia.
李玉 杨文利 张丰菊. OCTA观察高度近视眼行SMILE与FS-LASIK后浅层视网膜血流密度的变化[J]. 中华眼视光学与视觉科学杂志, 2019, 21(6): 401-407.
Yu Li, Wenli Yang, Fengju Zhang. Effect of Suction on the Retinal Superficial Vascular Networks's Flow Density after SMILE and FS-LASIK in High Myopia Using Optical Coherence Tomography Angiography. Chinese Journal of Optometry Ophthalmology and Visual science, 2019, 21(6): 401-407. DOI: 10.3760/cma.j.issn.1674-845X.2019.06.001
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