Eagle Eyes

All enemies in line of sight are exposed. Even if the enemy is invisible they are still revealed.

Smokes block line of sight but mist from cards like Phantom Site A does not affect this card and enemies are still revealed even if they are far enough away in the mist that you can't see them.

Line of sight extends in a 180° arc in front of the player, so enemies can be revealed even if they are not on the your screen.