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.

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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.

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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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