From The Collaborative International Dictionary of English v.0.48 :
Eagle-eyed \Ea"gle-eyed`\, a.
Sharp-sighted as an eagle. "Inwardly eagle-eyed." --Howell.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
eagle-eyed
adj 1: capable of seeing to a great distance [syn: eagle-eyed,
keen-sighted, farseeing, longsighted]