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美国65岁以上老年人中大约有10％会发生早期年龄相关性黄斑变性（aged-relatedmaculardegeneration,简称AR－MD），其中6％将是严重类型的ARMD，严重类型AHMD的典型表现为脉络膜新生血管化（choroidalneotascularization，简称CNV）。CNV会使病人视力迅速下降，多数患者在确诊
Approximately 10% of older adults over the age of 65 in the United States undergo an age-related macular degeneration (AR-MD) of which 6% will be a severe type of ARMD. Serious types of AHMD typically manifest as choroidal neovascularization (Choroidal neotascularization, referred to as CNV). CNV patients will rapidly decline in visual acuity, most patients are diagnosed