Source : Webster's Revised Unabridged Dictionary (1913)

Quick-sighted \Quick"-sight`ed\, a.
   Having quick sight or acute discernment; quick to see or to
   discern. --Locke. --{Quick"-sight`ed*ness}, n.

Source : WordNet®

quick-sighted
     adj 1: having very keen vision; "quick-sighted as a cat" [syn: {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"- Leonard Bacon [syn: {sharp-sighted}, {sharp-eyed}]