Shaykh Shamsuddin Muhammad bin Qaroon has narrated anotherincident. A person named Najm who had the title of Aswad lived in Waqusa a well known village on the banks of Euphrates. He was a righteous and a pious man. He wife, Fatima was also a very nice lady and they had two children, a boy named Ali and a daughter named Zainab. It so happened that the couple lost their eyesight due to some reason and this happened in 712 A.H. They remained in this condition for a long time.
One day his wife observed that someone was passing a hand over hereyes and saying: Get up, the Almighty Allah has restored your eyesight; serve your husband with all sincerity.
When she opened her eyes she found the house illuminated by a powerful light and she understood it was due to the effulgence of Imam Zamana (a.s.).
Reference : Beharul anwar vol 51.52.53 , Part 1 , The Promised Mahdi