Whose eyes are open — Heb. Who had his eyes shut, but now open. The eyes of his mind, which God had opened in a peculiar and prophetical manner, whence prophets are called Seers, 1 Samuel 9:9. It implies that before he was blind and stupid, having eyes, but not seeing nor understanding.
Related Commentaries of Numbers 24:3
Numbers 24:3
3 And he took up his parable, and said, Balaam the son of Beor hath said, and the man whose eyes are open hath said: