WordNet (r) 3.0 (2006):

sharp-eyed
    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]
    3: having keen eyesight [syn: keen-eyed, sharp-eyed]