Fig. 1
From: Relationship between retinal vessel tortuosity and oxygenation in sickle cell retinopathy
Example of a retinal image at 532Â 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 arrow