Photodynamic therapy is a therapy that uses a non-toxic photosensitizing substance, known as a photosensitizer, injected into the body and irradiated with a non-thermal or “cold laser” to produce a photochemical reaction at the target site instead of thermal coagulation, thereby destroying the abnormal lesion and achieving the purpose of treatment. Photodynamic therapy is indeed effective in eliminating choroidal neovascularization, but it does not guarantee a significant improvement in vision, but mainly keeps the patient’s condition stable and does not deteriorate rapidly out of control, and does not prevent the recurrence of the lesion, so many patients need to repeat photodynamic therapy. Photodynamic therapy, if combined with intraocular injection of anti-angiogenic drugs, can reduce the number of photodynamic therapy treatments, reduce costs, and reduce complications. Precautions for photodynamic therapy: 1. Before treatment: you need to prepare sunglasses, gloves, wear long-sleeved clothing and pants, and bring a headband or hat. 2.After treatment: Avoid bright light exposure for 48 hours. 3.After surgery, regular review should be done according to the physician’s order. Generally, OCT examination is required for each review, and fundus angiography should be performed once in 3 months.