Fundus imaging involves pushing a contrast medium through a vein in the upper limb and then taking successive pictures with a fundus imaging device to obtain morphologic photographs of the blood vessels in the fundus. Fundus imaging, known as fundus fluorescence angiography, shows the morphology of the retinal blood vessels and evaluates their function. A contrast medium is injected into the veins of the upper extremities, and then the fundus is photographed with the imaging equipment to visualize the filling of the fundus vessels with the contrast medium, and to show the morphology of the vessels as well as the presence of leakage, occlusion, and other functional abnormalities. After the fundus imaging test, the contrast medium injected into the body is usually excreted in the urine within 48 hours. It is recommended that patients with ocular abnormalities seek prompt medical attention to evaluate their condition and follow the doctor’s instructions for treatment.