Fig. 5. Retinal sO₂ in a healthy cohort.

A sO₂ measurements in 72 unique arteries (red) and 53 unique veins (blue) plotted against vessel diameter from 18 healthy volunteers; B Distribution of sO₂ measurements for major (diameter $\ge$ 100 $\mu m$, n = 36) and small (diameter $<$ 100 $\mu m$, n = 36) artery calibers and all veins; C Repeatability of arteries and veins (n = 24 for all artery, n = 17 for major artery, n = 7 for small artery, n = 17 for artery with R² ≥ 0.95, n = 7 for artery with R² < 0.95, n = 18 for all vein, n = 15 for major vein, n = 3 for small vein, n = 11 for vein with R² ≥ 0.95, n = 7 for vein with R² < 0.95). * indicates $p$ <0.05 and *** indicates $p$ <0.001 from two-sample t-test. All error bars are standard deviations.