Developmental Changes in Retinal Microvasculature in Children: A Quantitative Analysis Using Optical Coherence Tomography Angiography.

Purpose: To quantify the macular microvasculature in healthy children of various ages by using optical coherence tomography angiography (OCTA).
Design: Prospective cross-sectional study.
Methods: A total of 333 normal children from 4 to 16 years old were included. OCTA was performed on a 3- × 3-mm area centered on the macular region. Vascular density, perfusion density, fovea avascular zone (FAZ) area, FAZ perimeter, and FAZ acircularity index (AI) were measured and adjusted for axial length. Differences were compared among various ages.
Results: Among the different age groups, both macular vascular density and perfusion density increased with age (P < .0001 and P = .0028, respectively). After adjustments were made for the spherical equivalent (SE) and axial length, macular vascular density was significantly associated with age (r = 0.183; P = .001) No factors were significantly correlated with the perfusion density after adjustment for the age, SE, or axial length. The FAZ area and FAZ perimeter did not change among groups of different ages. Nevertheless, the AI of FAZ in the 4.00-6.99-year-old group was smaller to that of the 13.00-15.99-year-old group (P = .03). Younger children had significantly higher rates of nonconsecutive vessels branched toward the macular center (P = .0002) and vascular loops contributing to irregular shapes of FAZ (P = .024).
Conclusions: Macular vascular density and perfusion density continuously increase with age in children. Despite the fact that FAZ area and perimeter did not change, the microstructure of FAZ pruned and tended to form a smooth and regular avascular area during development.
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