It is narrated from Nubaih Ibn Wahb       who stated, “We departed with Aban Ibn Uthman      (in the state of lhram). When we arrived at a place called Malal, ‘Umar Ibn ‘Ubaidullah      suffered with pain in his eyes. When we reached Rawhaa, his pain became intense. He sent a message to Aban Ibn ‘Uthman     asking him (what to do). Aban sent him a message to apply aloes to them, for indeed ‘Uthman narrated from the Messenger of Allah in relation to the man whose eyes are afflicted whilst he is in the state of Ihraam that he may apply aloes to them.“

(Sahih Muslim)