The Collaborative International Dictionary of English v.0.48:

Sharp-sighted \Sharp"-sight`ed\, a.
   Having quick or acute sight; -- used literally and
   figuratively. -- Sharp`-sight`ed*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sharp-sighted
    adj 1: having very keen vision; "quick-sighted as a cat" [syn:
           argus-eyed, hawk-eyed, keen-sighted, lynx-eyed,
           quick-sighted, sharp-eyed, sharp-sighted]
    2: keenly perceptive or alert; "quick-sighted into the faults of
       the time"- Leonard Bacon [syn: quick-sighted, sharp-
       sighted, sharp-eyed]