资料来源 : Webster's Revised Unabridged Dictionary (1913)

Sharp-sighted \Sharp"-sight`ed\, a.
   Having quick or acute sight; -- used literally and
   figuratively. -- {Sharp`-sight`ed*ness}, n.

资料来源 : WordNet®

sharp-sightedness
     n : sharpness of vision; the visual ability to resolve fine
         detail (usually measured by a Snellen chart) [syn: {acuity},
          {visual acuity}]