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(a) Retinal image with major arteries and veins labeled (a and v); the outlined edges of a vein (v3) were identified by multiple diameter measurements; (b) Red crosses overlaid on the retinal image indicate the positions of a microsphere traversing a vein (v3), visualized over 8 consecutive images; (c) A cross-sectional vascular PO2 map (rectangle) overlaid on the retinal image, depicting values in veins (v1, v2, v3) and arteries (a2, a3). Color bar displays PO2 in mmHg.
