简述干性型老年性黄斑变性的临床表现。
老年性黄斑变性干性型(萎缩型或非渗出型):发展慢,黄斑区呈黄白色边界不齐的地图样萎缩,色素紊乱,病变边缘有玻璃膜疣,中心视力下降;眼底荧光血管造影在萎缩区脉络膜毛细血管充盈迟缓甚至不充盈。
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