PATIENCE IN BLINDNESS H 35 "Allah, the Mighty, the Glorified says: 'When I afflict the two beloved faculties (eyes) of a worshiper of Mine, and he remains patient with this affliction, in their place I will give him Paradise.'" R 35 Bukhari with a chain up to Anas who related that the Prophet, praise and peace be upon him, said the above.
34- وعن أنس رضي الله عنه ، قَالَ : سمعتُ رسولَ الله صلى الله عليه وآله وسلم ، يقول : "إنَّ الله تعالى ، قَالَ : إِذَا ابْتَلَيْتُ عبدي بحَبيبتَيه فَصَبرَ عَوَّضتُهُ مِنْهُمَا الجَنَّةَ" يريد عينيه ، رواه البخاري .