I was with the Messenger of Allah ﷺ while Maymunah was with him. Then Ibn Umm Maktum came. This happened when we were ordered to observe veil (purdah). The Prophet ﷺ said: Observe veil from him. We asked: Messenger of Allah! is he not blind? He can neither see us nor recognise us. The Prophet ﷺ said: Are both of you blind? Do you not see him? AbuDawud said: This was peculiar to the wives of the Prophet ﷺ. Do you not see that Fatimah daughter of Qays passed her waiting period with Ibn Umm Maktum. The Prophet ﷺ said to Fatimah daughter of Qays: Pass your waiting period with Ibn Umm Maktum, for he is a blind man. You can put off your clothes with him. (Using translation from Abū Dāʾūd 4112)
كُنْتُ عِنْدَ النَّبِيِّ ﷺ وَعِنْدَهُ مَيْمُونَةُ فَأَقْبَلَ ابْنُ أُمِّ مَكْتُومٍ وَذَلِكَ بَعْدَ أَنْ أُمِرْنَا بِالْحِجَابِ فَدَخَلَ عَلَيْنَا فَقَالَ احْتَجِبَا فَقُلْنَا يَا رَسُولَ اللهِ أَلَيْسَ أَعْمَى لَا يُبْصِرُنَا وَلَا يَعْرِفُنَا؟ فَقَالَ النَّبِيُّ ﷺ أَفَعَمْيَاوَانِ أَنْتُمَا أَلَسْتُمَا تُبْصِرَانِهِ؟