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Wide-angle indocyanine green angiogram of the normal left eye of a 32-year-old volunteer is shown. Choroidal drainage routes are divided in four quadrants based on the horizontal and vertical watershed zones (dashed line). Venous blood in each quadrant drains into the corresponding regional vortex veins. Many choroidal veins merge into an ampulla of the vortex vein (arrow). Reproduced with permission from reference 25
