It is narrated from Sayyiduna Zaid bin Arqam (may Allah be pleased with him) that my eye was hurting, so the Prophet (peace and blessings of Allah be upon him) visited me to inquire about my health.

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that he said: I heard the Prophet (peace and blessings of Allah be upon him) say: "Allah, the Mighty and Majestic, said: When I test My servant by taking away his two beloved things, meaning his two eyes, and he remains patient, I give him Paradise in return."

It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that he reports from the Prophet (peace and blessings of Allah be upon him): "Allah says: O son of Adam, when I take away your two most beloved things (your eyes), and you endure this calamity with patience and seek reward, then I will not be pleased with any reward for you less than Paradise."