Infrared absorption angiograms of the cat fundus were obtained by regional arterial injection of indocyanine green. There was better resolution of the retinal circulation than that obtained by intravenous injection, but in the choroid only choriocapillaris filling was seen.
Hill DW, Young S. Infrared Angiography of the Cat Fundus Oculi. Arch Ophthalmol. 1975;93(2):131-133. doi:10.1001/archopht.1975.01010020137009