argus-eyed in WordNet English dictionary

1. carefully observant or attentive; on the lookout for possible danger
   "a policy of open-eyed awareness"; "the vigilant eye of the town watch"; "there was a watchful dignity in the room"; "a watchful parent with a toddler in tow"
   argus-eyed  open-eyed  vigilant  wakeful 
   
2. having very keen vision
   "quick-sighted as a cat"
   argus-eyed  hawk-eyed  keen-sighted  lynx-eyed  quick-sighted  sharp-eyed  sharp-sighted