This paper reports the possibility of measuring the filling pattern of a vortex vein in vivo using the method of choroidal angiography with indocyanine green dye (ICG), as described by Flower. We studied eight eyes of six healthy volunteers in order to establish the normal filling time of the vortex veins. In the temporal vortex veins studied the dye was first seen about 1.2 s after initial filling of the corresponding radial choroidal arteries. The vortex veins were maximally fluorescent within 5 s.