Table 2 Reliability estimates of quantitative optical coherence tomography-angiography (OCT-A) metrics measurements using an automated analysis program in a subset of 30 eyes from 30 diabetic participants. Two OCT-A scans were acquired during first visit for these participants for intra-session repeatability assessment. These 30 patients were also invited for another visit for OCT-A scan within 2 weeks for inter-session reproducibility assessment.

FAZ Area (mm²)

0.976 (0.950–0.988)

0.040 (0.036–0.043)

0.967 (0.932–0.984)

0.050 (0.045–0.055)

FAZ Circularity

0.751 (0.540–0.873)

0.125 (0.114–0.138)

0.720 (0.490–0.856)

0.129 (0.117–0.141)

Total Vessel Density (%)

0.840 (0.691–0.920)

0.069 (0.063–0.076)

0.777 (0.583–0.887)

0.090 (0.081–0.098)

Parafoveal Vessel Density (%)

0.826 (0.667–0.913)

0.078 (0.071–0.085)

0.774 (0.577–0.885)

0.098 (0.088–0.107)

Fractal Dimension

0.989 (0.978–0.995)

0.010 (0.009–0.011)

0.987 (0.972–0.994)

0.010 (0.009–0.011)

Vessel Density Index (mm)

0.633 (0.358–0.807)

0.001 (0.0008–0.001)

0.624 (0.346–0.802)

0.001 (0.0008–0.001)