Photodynamic therapy is a treatment that involves the intravenous injection of a photosensitive drug, which is subsequently activated in the retina by applying a special light to the affected area. It is done with the intravitreal administration of verteporfin. Once the drug is distributed by retinal vessels, it proceeds to illuminate the damaged area of the retina with a light source for a few seconds. It is a safe technique performed on an outpatient basis. When administering a drug sensitive to light it is recommended that the patient does not receive direct sunlight for at least 48 hours.