Umar bin Ubaydullah bin Ma'mar suffered pain in his eyes at Malal while he was in ihram. So he sent a message to Aban bin Uthman bin Affan (may Allah be pleased with him) asking what treatment should be used. Aban (may Allah be pleased with him) told him: Apply a compress of aloes (sabir), for I heard Uthman bin Affan (may Allah be pleased with him) narrating from the Messenger of Allah (peace and blessings be upon him) that he (peace and blessings be upon him) said: "He should apply a compress of aloes (sabir)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9126