Evaluation of the fundus blood flow in the early postoperative period after femtolaser lenticular CLEAR technology correction of myopia using OCT-angio

Purpose. To evaluate state of the blood flow parameters of the macular region, the optic nerve disc, and the state of the premacular bag after the formation of the corneal lenticle during the correction of myopia using CLEAR technology. Material and methods. From December 2021 to February 2022, 25 patients (44 eyes) aged 18 to 39 years (31.88±1.15, M±m) with myopia (–4.08±0.19, M±m) and myopic astigmatism (–0.47±0.04, M±m), who underwent femtolaser lenticular vision correction using CLEAR technology. As additional examination methods, all patients underwent optical coherence tomography on the Nidek RS-3000 Advance AngioScan device (NIDEK, Japan) in order to evaluate the following parameters: vascular network density and blood flow index in the macular region of the retina and optic disc before surgery and 1 day after the CLEAR correction, as well as to determine the size of the premacular bag before surgery and 1 day later. Results. In patients after performing vision correction using CLEAR technology, there are no statistically significant changes in the vascular network density and blood flow index in the macular region of the retina and in the optic disc, as well as the size of the premacular bag 1 day after surgery. Conclusion. With femtolaser lenticular correction of myopia, a longer vacuum effect on the eye is provided at the stage of corneal lenticular formation. However, this does not affect the condition of the blood flow of the posterior segment of the eye in the first day after surgery. Key words: femtolaser correction, lenticula, myopia, vacuum exposure, vascular network density, blood flow index, macular area of the retina, Optical Nerv, premacular bag