A diagnostic procedure using a special camera via the dye tracing method to examine blood circulation within the retina. Sodium fluorescein is injected into a vein in the arm or hand (into the systemic circulation). Angiogram is obtained by taking pictures of the fluorescein as the dye travels through the blood in the eye after illumination in the retina with blue light at 490 nanometers’ wavelength. The technique diagnoses, tracks changes in eye diseases, and targets treatment areas.