FFA gives information about the retina layer and the structure of blood vessels. It is used to see vision center of the retina and its vascular structure. It is performed by intravenous injection of a special stain. It is displayed with a camera or a video camera.
While normal retina tomography shows the vessels on the retina, ICG technique is used to display vessels on choroid. In this method, a special medication is administered to the arm of the patient. When the medication reaches the eye by blood circulation, it dilates the vessels, and choroidal vessel structure becomes much more visible. By this test, it is possible to see the back side of the retina as well as determine any leakage or abnormal vasculature in choroidal vessels.
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