I had a blind cat once. She had been hit by a motorcycle. The cat was partially blind in one eye and fully blind in the other one. We saw her sitting under a tree one day. There was a bird nest in the tree and a bird was diving toward the cat. She just sat there motionless as the bird kept flying closer to her. Finally the bird got too close and she jumped up and with one claw snatched that bird from the air. It was an amazing thing to watch.