The most common clinical method for determining the presence or macular oedema (or the lack thereof) is a clinical examination with a slit-lamp and a dilated pupil.  However, complementary imaging tests are often necessary like an optical coherence tomography, which enable an evaluation of the changes in the thickness or morphology of the macula to be assessed in very high definition and allow us to do a follow-up on the response to the treatment. The fluorescein angiography, a medical procedure in which a fluorescent dye is injected into the bloodstream and photographs are taken of the back of the eye, is also a useful test for evaluating retina circulation and for the study of the causes of macular oedema.