The organ of sight, and a point of attention. Also what Odin paid with — the price of drinking from the well.
Old English eage (eye), from Proto-Germanic *augo, from Proto-Indo-European *okw- (to see); the organ of sight, and by extension a fixed point of attention.
Sight itself, and the place attention settles. The old story of Odin's payment keeps a warning alive: seeing sometimes costs something.