A new technique for fundus angiography is described, employing intracarotid injection of indocyanine dye in combination with high speed infrared film in a standard fundus camera. The studies reported have been done in owl monkeys, whose choroidal filling patterns are seen much better than contrast angiograms made by the fluorescein method, presumably because infrared light is not blocked by the pigment epithelium. The dye is apparently of very little toxicity, and the method should be safely applicable in man.
Kogure K, David NJ, Yamanouchi U, Choromokos E. Infrared Absorption Angiography of the Fundus Circulation. Arch Ophthalmol. 1970;83(2):209-214. doi:10.1001/archopht.1970.00990030211015