Umar bin Ubaidullah developed an eye ailment while in the state of Ihram. He wanted to apply kohl to his eyes, but Sayyiduna Aban bin Uthman (may Allah be pleased with him) forbade him and said that he could apply patience as kohl (i.e., he should be patient and not apply kohl until he comes out of Ihram), because I heard Sayyiduna Uthman (may Allah be pleased with him) narrate such a hadith from the Prophet (peace and blessings be upon him).