Quantification of choroidal blood-flow parameters using indocyanine green video-fluorescence angiography and statistical picture analysis.

A method for indocyanine green video-fluorescence angiography of the human choroid is described using a 30 degrees fundus camera (C. Zeiss) with external light supply, a low-light-level TV camera, and a video recorder. Bloodflow parameters for the choroid were obtained from the video recording using a picture-analysis system (IBAS, Kontron). These included: the mean time for arterial, capillary and venous filling and a parameter corresponding to the amount of perfused capillaries in the choroid. Angiograms were performed on normal, healthy subjects at normal and increased intraocular pressures and on patients with dry senile macular degeneration. Examples of the results are shown and discussed.