Age-related macular degeneration: Mostly over the age of 50 years, both eyes develop successively or simultaneously, with progressive visual impairment. The disease is the leading cause of irreversible damage to vision in people over 60 years of age. Its incidence increases with age. The exact cause of the disease is not known. It may be related to genetic factors, long-term chronic photodamage to the macula, metabolic and nutritional factors, etc. There are two types of clinical manifestations of the disease: 1, dry age-related macular degeneration: slow onset, gradual loss of vision in both eyes, may have visual distortion. 2, wet age-related macular degeneration: also known as exudative or neovascular age-related macular degeneration. Patients may have sudden loss of vision, visual distortion or central dark spot in the affected eye. In case of massive hemorrhage, the hemorrhage can break through the retina into the vitreous and produce vitreous hemorrhage.