eyesight

vision, eyesight, sight, perception

这些名词均含“视力、视觉”之意。
vision: 书面用词，含义广泛，指人的视力或视野，也可指远见卓识。
eyesight: 普通用词，指眼睛的正常功能。
sight: 普通用词，与eyesight同义，可换用，指由实实在在的事物引起的视觉。
perception: 指视觉，也可泛指其它器官的功能，或引申指敏锐的理解力。

名词 eyesight:

1. normal use of the faculty of vision
   同义词：seeing, sightedness

1. His eyesight is failing.
   他的视力渐渐衰退了。
2. His bad eyesight exempted him from military service.
   他因视力不好而免服兵役。
3. His eyesight is becoming progressively worse.
   他的视力越来越差。
4. The animal's good sense of smell compensates for its poor eyesight.
   这动物嗅觉灵敏弥补了视力之不足。
5. Poor eyesight will exempt you from military service.
   视力不佳将使你免服兵役。
6. The house is within eyesight.
   房子在视力范围之内。
7. He has poor eyesight.
   他的视力不好。