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Adjective: sharp-sighted  'shaa(r)p'sI-tid
  1. Having very keen vision
    "sharp-sighted as a cat";
    - argus-eyed, hawk-eyed, keen-sighted, lynx-eyed, quick-sighted, sharp-eyed
  2. Keenly perceptive or alert
    "sharp-sighted into the faults of the time";
    - quick-sighted, sharp-eyed

See also: perceptive, sighted