Sir,

We read this report with interest.1 However, we feel that the evidence that the arteriole in question is a cilioretinal artery, as opposed to an early posterior bifurcation of the central retinal artery, is not convincing.

The claim that in the early venous phase of the FFA, the dye appears faded in the upper arteriole, whereas still bright in the lower arteriole, is not sufficient evidence to support a diagnosis of a cilioretinal artery. If the dye had entered the superior arteriole earlier than the inferior, one would expect to see the superior venous filling to be at a later stage than the inferior. On the contrary, the published frame shows symmetrical lamellar flow in both the superior and inferior retinal venous circulation, suggesting that the dye entered their feeding arterioles at the same time.

An earlier frame, were it to show simultaneous filling of this arteriole and the choroid in the absence of filling of the inferior arteriole, would be conclusive, but was presumably not available.