Fluorescein Angiography
Intravenous Fluorescein angiography (IVFA) or fluorescent angiography is a technique for examining the circulation of the retina using the dye tracing method. It involves injection of sodium fluorescein into the systemic circulation, and then an angiogram is obtained by photographing the fluorescence emitted after illumination of the retina with blue light at a wavelength of 490 nanometers. The fluorescein dye also reappears in the patient urine, causing a yellow-green appearance. It can also cause discolouration of the saliva.
Fluorescein angiography is one of several health care applications of this dye, all of which have a risk of severe adverse effects. See fluorescein safety in health care applications. Fluorescein angiography does not involve the use of ionizing radiation.
Read more about Fluorescein Angiography: Equipment, Technique, Normal Circulatory Filling, Pathologic Findings, Other Types of Fluorescent Angiography