Assessment of blood flow parameters of the limbal area using an angioregime optical coherence tomograph in patients with myopia and myopic astigmatism who underwent excimer laser vision correction

Abstract

Purpose. To assess the state of blood flow in the limbal area in patients with myopia and myopic astigmatism before and after excimer laser vision correction using the Nidek RS-3000 AngioScan optical coherence tomograph. Material and methods. A total of 22 patients aged 18 to 37 with different degrees of myopia and myopic astigmatism who underwent excimer laser vision correction were examined. Additionally, the blood flow of the limbal area was studied in the preoperative and early postoperative periods using the Nidek RS-3000 AngioScan optical coherence tomograph using a module for scanning the anterior segment of the eye. Results. One hour after excimer laser vision correction, there is a decrease in blood flow of the limbal area in all 4 analyzed sectors (upper, lower, temporal, nasal), after 1 day there is an increase in blood flow indicators, tending to preoperative values. We were unable to identify the dependence of the degree of blood flow on the method of formation of the corneal flap. Conclusion. Using OCT angioregime it is possible to assess the condition of limb blood flow. In the first hour after laser vision correction blood flow parameters change in all 4 studied sectors, with a tendency to decrease, and recover to preoperative values 1 day after the surgery. Key words: optical coherent angiography of the limbal area, excimer laser vision correction, femtolaser vision correction, myopia, myopic astigmatism.