Choroidal neovascularization is most commonly seen in age-related macular degeneration, which is an aging change in the structure of the macula. The exact etiology is unknown and may be related to genetics, vascular sclerosis, oxidative damage, chronic photodamage, inflammation, and metabolic nutrition. Neovascularization is very fragile and prone to hemorrhage and fluid leakage. These hemorrhages and fluid leaks lead to edematous bulging of the macula, and destruction of the macula soon occurs. As wet age-related macular degeneration progresses, there is a rapid loss of central vision. The disease mostly occurs over 45 years of age, and its prevalence increases with age, making it an important disease of blindness in the elderly today. Choroidal neovascularization is also seen in pathological myopia, which refers to patients with myopia of -6.0D or greater, usually with an eye axis length greater than 26 mm, and can cause a range of serious ocular pathologies. Choroidal neovascularization is the most common cause of choroidal neovascularization in patients under the age of 50 years, due to choroidal thinning, retinal degeneration, and tissue ischemia. In addition choroidal neovascularization is seen as central exudative choroidal retinopathy, often occurring in the macula as isolated exudative foci with choroidal neovascularization with hemorrhage and plasmacytoid or/and hemorrhagic pigment epithelial or/and neuroepithelial detachment. There are many new methods to treat choroidal neovascularization, and the best internationally recognized method is photodynamic therapy (PDT), which we have developed. The principle is to inject a specific photosensitizer into the patient’s bloodstream, and when the drug is circulated to the retina, a 689 nm laser is used to excite the photosensitizer, thus destroying the abnormal neovascularization without damaging the normal retinal tissue. . It makes the neovascularization embolize and atrophy, and stops bleeding and exudation. So it is used to treat choroidal neovascularization caused by age-related macular degeneration, pathological myopia, central exudative choroidal retinopathy, etc., especially the choroidal neovascularization under the central recess. If patients experience visual distortion, vision loss and darkness in the center of the visual field, it is recommended to seek prompt examination by a professional physician, and the timing of treatment is very important to effectively prevent the progression of the lesion.