An angiogram is a diagnostic procedure used in ophthalmology to image the blood vessels of the retina. It involves inserting a needle into a vein, usually in the arm or back of the hand, and injecting a contrast dye. As the dye circulates through the bloodstream, images of the retina are taken using specialised digital cameras and scanning laser technology. The procedure usually takes around 5 minutes, and the results are available immediately. The procedure is safe, with a low risk of severe adverse reactions. A yellow-coloured dye is most often used for retinal angiography. The dye glows when excited by a certain wavelength of light, which allows for imaging of the retinal circulation.
Angiography is useful in the diagnosis and monitoring of conditions such as age-related macular degeneration, diabetic eye disease, and retinal vascular occlusions.
The risks of angiography are extremely small. There is a low risk of transient nausea as the dye circulates. The skin shows mild yellowish discolouration for a few hours after the procedure, and the urine will be bright orange immediately following the procedure.
Angiography With Green
An iodine-based contrast dye, glows when excited by a certain wavelength of light. It is often used in conjunction with the yellow coloured dye. As in fluorescein angiography, The dye is injected through a needle into a vein. The procedure can take up to 10 minutes, and the results are available immediately.
This method is used to assess the choroid, the layer behind the retina, and can be used in the diagnosis and management of conditions affecting this layer. These include central serous retinopathy (CSR) and types of age-related macular degeneration such as polypoidal choroidal vasculopathy.