central vision field 中央视野
Patients may report flashes of light, floaters, a curtain or shadow moving over the field of vision, and peripheral or central visual loss.
患者可能会看到闪光，漂浮物，帷幕或阴影遮挡住了视野，以及周边或中心视力丧失。
Possible signs of AMD include a loss of central vision, seeing a dark spot in the center of the field of vision, distorted or blurred vision, and wavy vertical lines.
年龄相关的黄斑退行性改变可能存在的体征包括：中心视觉丧失（在视野中央看到一个黑斑）、视物变形或视力模糊以及看到波浪状的垂直线。
Cataract: Opacity of the eye's crystalline lens. Cataracts causing central visual-field defects are most likely to affect vision.
白内障：表现为眼内水晶体混浊的眼科病。白内障导致的视野缺损多半会损害视力。
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