Table 1.
Measurements of global and macular retinal vascular diameter.
| Method | Measurement | Vascular diameter before laser treatment (μm) ± SD |
Vascular diameter after laser treatment (μm) ± SD |
P value |
|---|---|---|---|---|
| IVAN | CRAE | 140.3 ± 13.2 | 139.3 ± 13.1 | 0.44 |
| CRVE | 214.1 ± 23.6 | 213.1 ± 22.8 | 0.40 | |
| Control CRAE | 141.5 ± 14 | 138.6 ± 15.8 | 0.26 | |
| Control CRVE | 213.1 ± 24.2 | 214.0 ± 25.0 | 0.84 | |
|
| ||||
| Modified IVAN | Macular arterioles | 73.5 ± 11.2 | 72.0 ± 10.7 | 0.04∗ |
| Macular venules | 63.5 ± 17.8 | 62.4 ± 17.6 | 0.02∗ | |
| Control macular arterioles | 71.7 ± 11.9 | 71.8 ± 12.2 | 0.89 | |
| Control macular venules | 62.0 ± 15.5 | 61.2 ± 15.7 | 0.10 | |
Data are presented as mean with standard deviation (SD). Vessel diameters are compared before and after laser treatment with the Wilcoxon signed-rank test. ∗Statistically significant. CRAE: central retinal arteriolar equivalent; CRVE: central retinal venular equivalent; m-IVAN: modified IVAN; MRAE: macular retinal arteriolar equivalent; MRVE: macular retinal venular equivalent [65].