同义词

n. eyesight，seeing

参考例句

1. Use the light. And return to clear-sightedness.
用其光，复归其明。
2. he who stays by gentility is strong. Use the light. And return to clear-sightedness.
用其光，复归其明，无遗身殃，是为习常。
3. Acupuncture may be helpful for short=sightedness, but a rather prolonged treatment is needed.
针刺对近视眼可能有好处，但是需要较长的时间。

英英解释

n.
  1. normal use of the faculty of vision

网络释义

sightedness
精明的人;
far sightedness
远见;
near sightedness
眼光短浅;
far-sightedness
远视眼; 远见卓识;
suffer short-sightedness
患有近视;