随着群体年龄增加患病率稳定增长，这种相关的视力缺失也会逐渐增加。
With the elderly population steadily growing, the burden related to this loss of visual function will increase.
MS的症状包括视力模糊、平衡缺失、共济失调、极度疲劳、瘫痪和失明。目前尚无可以治愈的方法。
Ms symptoms may include blurred vision, loss of balance, poor coordination, extreme fatigue, paralysis and blindness. There is no cure.
在美国40岁以及以上的人群中，超过340多万（ 3 ％ ）已经失明或者存在视力障碍，同时数百万人处于不断进展的视觉侵害和视觉缺失的风险中。
More than 3.4 million (3%) Americans 40 years and older are either blind or are visually impaired and millions more are at risk for developing vision impairment and blindness.
在美国40岁以及以上的人群中，超过340多万（ 3 ％ ）已经失明或者存在视力障碍，同时数百万人处于不断进展的视觉侵害和视觉缺失的风险中。
More than 3.4 million (3%) Americans 40 years and older are either blind or are visually impaired and millions more are at risk for developing vision impairment and blindness.
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