Open English Wordnet
Adjectives
(s)argus-eyed, hawk-eyed, keen-sighted, lynx-eyed, quick-sighted, sharp-eyed, sharp-sightedhaving very keen vision“quick-sighted as a cat”
(s)quick-sighted, sharp-sighted, sharp-eyedkeenly perceptive or alert“quick-sighted into the faults of the time” (Leonard Bacon)