Musannaf Ibn Abi Shaybah

Habib bin Fuwaiq narrates that his father took him to the Messenger of Allah (peace be upon him) when his eyes were white and he could not see anything with them. The Prophet asked him, "What happened to you?" He replied, "I was taming my horse when my foot stepped on a snake's egg, which affected my eye." The Messenger of Allah (peace be upon him) blew into his eyes, and he began to see. He says, "I saw him threading a needle at the age of eighty, and his eyes were white."