Source : Webster's Revised Unabridged Dictionary (1913)

Open-eyed \O"pen-eyed`\, a.
   With eyes widely open; watchful; vigilant. --Shak.

Source : WordNet®

open-eyed
     adj : 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" [syn: {argus-eyed}, {vigilant}, {wakeful},
            {watchful}]