Relationship between vascular densities of choriocapillaris and the whole choroid using OCTA.

Abstract

To study the vascular density (VD) of choriocapillaris and the whole choroid using optical coherence tomography-angiography (OCTA). Cross-sectional study enrolling healthy individuals between 18 and 35years old and with an axial length (AL) lower than 26mm, who were examined with swept-source OCTA Triton DRI (Topcon). Color pictures of both VD were obtained from a fovea-centered 6 × 6mm macular exam, which were divided into 900 squares and codified into numbers. A total of 50 patients (100 eyes) with a mean age of 27.29 ± 3.90years and a mean AL of 23.67 ± 0.74mm were analyzed. The highest choroidal VD was found in juxtapapillary macula, being followed by the most temporal macula and fovea. The lowest was found in superior and inferior perifoveal areas. The highest VD in choriocapillaris was in the fovea. VD in this layer was uniform, with a decrease from temporal toward nasal. Both VD differed and but correlated, especially in the fovea and in inferior-temporal macula. VD of choriocapillaris and the whole choroid are not similar. The former is maximal in the fovea, and the latter is maximal in the juxtapapillary macula. In general lines, choroidal VD is higher than that of choriocapillaris. Both VD are directly correlated.