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

See also: perceptive, sighted