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Credit
Central Retinal Vein Occlusion. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.
Fluorescein angiography image to document vascular changes in the eye caused by a blockage in the central retinal vein. The changes occur when the blood supply is restricted or reduced, compromising the oxygen supply to the retina. Fluorescein angiography involves an injection of sodium fluorescein dye into a vein in the arm, which is photographed as it travels through the blood vessels in the eye. Ischaemic changes indicate parts of the retinal circulation have begun to shut down due to an insufficient supply of oxygen. This irreversible process begins with the smallest capillaries, and if left untreated expands to include the larger vessels and can be seen in the irregular black patches between the larger vessels. Photograph 24.07.2015