患者一旦染上一种称之为年龄相关性黄斑变性(湿型amd)的疾病，其血管就会出现异常且会扩散到视网膜的中心，损害患者的中心视觉。

The disease is wet age-related macular degeneration (wet AMD), in which blood vessels grow abnormally and leak into the centre of the retina, damaging sufferers' central vision.

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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。

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.

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这些物种都有独特的视觉中心，眼睛很大。

These species have distinctive visual centers and big eyes.

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