Table 2.
Quantification of Individual OCTA Features
| Mean ± SD | |||||
|---|---|---|---|---|---|
| Feature | Control | No DR | Mild DR | Moderate DR | Severe DR |
| SCP | |||||
| BVT | 1.11 ± 0.07 | 1.09 ± 0.01 | 1.14 ± 0.05 | 1.17 ± 0.06 | 1.23 ± 0.04 |
| BVC (µm) | 40.16 ± 0.51 | 41.28 ± 0.63 | 41.17 ± 1.35 | 40.95 ± 0.58 | 41.29 ± 1.09 |
| VPI | 29. 77 ± 1.52 | 31.04 ± 1.58 | 28.30 ± 2.09 | 28.91 ± 2.02 | 27.33 ± 3.30 |
| BVD (%) | |||||
| SCP | |||||
| C1, 2 mm | 56.93 ± 4.07 | 42.33 ± 7.48 | 50.44 ± 8.74 | 52.34 ± 5.71 | 44.40 ± 7.67 |
| C2, 4 mm | 56.49 ± 2.69 | 55.27 ± 4.00 | 54.09 ± 4.90 | 54.93 ± 4.06 | 52.47 ± 4.84 |
| C3, 6 mm | 54.45 ± 2.45 | 55.36 ± 3.14 | 52.77 ± 3.55 | 53.71 ± 3.94 | 52.54 ± 5.04 |
| DCP | |||||
| C1, 2 mm | 75.52 ± 3.70 | 63.03 ± 6.95 | 64.97 ± 8.60 | 67.22 ± 5.52 | 57.36 ± 8.46 |
| C2, 4 mm | 78.37 ± 3.87 | 71.52 ± 5.59 | 70.25 ± 6.45 | 70.17 ± 5.12 | 62.50 ± 7.62 |
| C3, 6 mm | 76.70 ± 4.93 | 71.45 ± 6.02 | 68.08 ± 6.62 | 67.11 ± 5.23 | 60.77 ± 7.72 |
| FAZ-A | |||||
| SCP (mm2) | 0.30 ± 0.06 | 0.37 ± 0.16 | 0.33 ± 0.05 | 0.38 ± 0.07 | 0.46 ± 0.06 |
| DCP (mm2) | 0.39 ± 0.08 | 0.40 ± 0.14 | 0.46 ± 0.07 | 0.53 ± 0.12 | 0.58 ± 0.09 |
| FAZ-CI | |||||
| SCP | 1.14 ± 0.11 | 1.14 ± 0.04 | 1.29 ± 0.14 | 1.38 ± 0.14 | 1.46 ± 0.18 |
| DCP | 1.18 ± 0.12 | 1.09 ± 0.02 | 1.31 ± 0.21 | 1.42 ± 0.19 | 1.49 ± 0.17 |
SCP, superficial capillary plexus; BVT, blood vessel tortuosity; BVC, blood vessel caliber; VPI, vessel perimeter index; BVD, blood vessel density; C1, C2, and C3, three circular zones; DCP, deep capillary plexus; FAZ-A, foveal avascular zone area; FAZ-CI, foveal avascular zone contour irregularity.