Saul was struck blind.

The vision of light blinded his vision, and the revelation of truth struck his mind numb. He had three days in which to let this truth settle into his heart and his mind, and when his sight was miraculously restored and the scales finally fell away from his eyes, he knew that the God he thought he was serving and this Jesus that he was fighting against were actually one and the same – that is, this Jesus was the promised Messiah, and was God in human flesh.