Fig. 1From: Relationship between retinal vessel tortuosity and oxygenation in sickle cell retinopathyExample of a retinal image at 532 nm in a NC subject. a Hemoglobin oxygen saturation (SO2) values measured in the retinal vessel segments are displayed in pseudo color. Color bar shows SO2 values in percent. b Centerlines (red lines) of retinal vessels used for tortuosity measurements are overlaid on vessel segments. Inflection points (blue squares) for one vessel segment are indicated by the black arrowBack to article page