Musannaf Ibn Abi Shayba 27:166

Muhammad ibn Bishr narrated to us, he said: Abd al-Aziz ibn Umar narrated to us, he said: A man from Banu Salaman ibn Sa’d narrated to me, from his mother, that her maternal uncle, Habib ibn Abi Fudayk, narrated to her that his father took him out to the Messenger of Allah (may Allah bless him and grant him peace), and his eyes were whitened, he could not see anything with them. He asked him what had afflicted him. He said: "I was exercising a camel of mine, and my foot fell upon a snake's egg, and my sight was afflicted." The Messenger of Allah (may Allah bless him and grant him peace) blew into his eyes, and he regained his sight. He said: "I saw him threading a needle while he was eighty years old, and his eyes were [still] whitened."