The question, then, is how to relate viewing distance to a person's visual acuity.
现在的问题是，怎样将欣赏距离和人们的视觉灵敏度联系起来。
However, over time constant visual stress may lead to a permanent reduction in distance vision.
然而，经常性的视疲劳会造成永久性的远视力下降。
However, over time constant visual stress may lead to a permanent reduction in distance vision.
然而，经常性的视疲劳会造成永久性的远视力下降。
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