Eagle eyes are sharp, why no transplant of corneal for human?

Raptor eyes. Not quite. Raptors have two foveas connected by a visual streak. Their eyes are so large they cannot move. Fovea #1 is for far vision (seeing prey), and as they dive, the image goes down the visual streak until imaged on fovea #2 at the level of the talons. This allows them to catch their prey. Focusing has little to do with it.
More than cornea. Birds have the largest eyes relative to their size in the animal kingdom. Eagles have two maculas per eye. One set works for depth perception & the other set points off to the side. The result is extremely sharp vision across a panoramic view, not just centrally like us. Their ciliary muscles can change the shape of the lens rapidly and to a greater extent than mammals'.