Two main reasons can cause poor eyesight: too much time spent indoors studying and too little time spent outdoors playing.(导致视力下降的主要原因有两个：花在室内学习的时间太多，花在户外玩耍的时间太少。)
His bad eyesight exempted him from military service.(他因视力不好而免服兵役。)
Some insects have very good eyesight.(有的昆虫视力极佳。)
For example, sunglasses are not just for fashion but they can also serve as a great way to protect your eyesight from ultraviolet rays.(例如，太阳镜不仅仅是为了时尚，也是保护视力免受紫外线伤害的好方法。)
My eyesight is failing.(我眼力不济了。)
A consultant, after all, is not unlike an optician who prescribes a new pair of glasses—or framework—to improve your eyesight.(毕竟，一名顾问，并不能像配镜师一样给你配一副新的眼镜——或眼镜框——来改善你的视力。)
Eggs are very good for the eyesight.(鸡蛋对视力非常有益。)
People who have eyesight problems should go to a hospital and let a doctor decide what to do.(有视力问题的人应该去医院，让医生决定怎么做。)
Most people believe that reading in dim light causes poor eyesight, but that is untrue.(大多数人认为在昏暗的灯光下阅读会导致视力下降，但这并不正确。)
