Photodynamic therapy (PDT) eliminates new vessels from the choroid (choroidal neovascularisation) without appreciable damage to the surrounding tissue.
It is a quick, minimally invasive procedure performed in an outpatient setting. It consists of the intravenous perfusion of a photosensitive drug, and its subsequent activation by a laser with a defined wavelength, verteporfin® (active substance used) that has an affinity for vascular endothelial cells in multiplication, i.e., where it is "accumulated" in the abnormal structures (neovessels) that are proliferating.
After 10 minutes of drug perfusion, a laser is emitted, with a wavelength of approximately 690 nm, which will act only on the previously identified structures.
Before treatment, some complementary diagnostic tests are carried out, such as fluorescein angiography, indocyanine green angiography and optical coherence tomography (OCT) of the posterior segment.