• An inexpensive adapter mounted in front of the objective lens of a fundus camera permits routine fluorescein angiography of the heavily pigmented iris. Angiograms of these patients whose iris pigment was dense enough that standard methods of iris angiography would disclose little or no information were performed with the use of the adapter. For use in the study of the iris vasculature in the research laboratory, three dyes with spectral characteristics different from those of fluorescein allow angiography of the iris at different wavelengths. Angiograms using these dyes were performed on the eye of a cynomolgus monkey. The angiograms were each taken as close as possible to the same time sequence and show dramatically different filling and staining patterns.
D'Anna SA, Hochheimer BF, Joondeph HC, Graebner KE. Fluorescein Angiography of the Heavily Pigmented Iris and New Dyes for Iris Angiography. Arch Ophthalmol. 1983;101(2):289-293. doi:10.1001/archopht.1983.01040010291022