Sunan Ibn Majah, Chapter: The Chapters of Establishing the Prayer and the Sunnah Regarding Them

that a blind man came to the Prophet (saw) and said: "Pray to Allah to heal me." He said: "If you wish to store your reward for the Hereafter, that is better, or if you wish, I will supplicate for you." He said: "Supplicate." So he told him to perform ablution and do it well, and to pray two Rakah, and to say this supplication: "Allahumma inni as'aluka wa atawajjahu ilaika bimuhammadin nabiyyir-rahman. Ya Muhammadu inni qad tawajjahtu bika ila rabbi fi hajati hadhihi lituqda. Allahumma fashaffi'hu fiya (O Allah, I ask of You and I turn my face towards You by virtue of the intercession of Muhammad the Prophet of mercy. O Muhammad, I have turned to my Lord by virtue of your intercession concerning this need of mine so that it may be met. O Allah, accept his intercession concerning me)". Sahih