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Indocyanine-green angiography represents a major advance in imaging of the choroidal circulation. Recent technical innovations have permitted this diagnostic technique to find clinical application in many chorioretinal conditions. The indocyanine-green molecule has proven to be safe for human study. In age-related macular degeneration, indocyanine-green angiography may play an important role in the diagnosis of patients with occult choroidal neovascularization, leading to eventual increased efficacy with laser photocoagulation treatment. Histopathologic confirmation of a lesion noted by ICG angiography has been made. In multiple inflammatory conditions, as well as with central serous chorioretinopathy, distinct ICG patterns have emerged that may facilitate better understanding of the disease processes. With greater experience, ICG angiography may provide improved imaging, a better understanding of the pathogenesis, and new treatment approaches for various chorioretinal conditions.