keen world

From a BBC story about falconry:

My eyes searched the dappled camouflage in front of me – tree limbs, leaves and shadow – but I could not see her.
“Just keep walking,” Healy-Rennison instructed. “She sees us far better than we can see her.”
“Eyes like a hawk,” I mused aloud, treading onward.
“Ten times stronger than a human’s eyesight,” said Healy-Rennison, adding, “Like reading a newspaper across a football field.” (emphasis added)