Question: Is it allowed for a woman to uncover her face in the presence of a blind man? If she cannot uncover her face, what is the legal reason preventing her to do so?

Response: The correct opinion is that there is no harm in a woman uncovering her face in the presence of a blind man. A woman is ordered to cover herself in front of those who can see her in order for no temptation to arise. A blind man cannot see what is in front of him and he cannot look at what will excite him in a woman, nor is he conscious of it. There is the hadith that is recorded by al-Tirmidhi, who called it sahih, concerning the story of ibn Umm Maktum, where the Prophet (peace be upon him) [told Umm Salama and Maimuna] to wear hijab in front of him. [When they asked about it] he said,

"Are you two blind? Do you not see him?"

However, this hadith is considered weak by some scholars. Even assuming it is authentic, it is concerned with the woman looking at the man. Women are also ordered to lower their gaze and it is not allowed for a woman to look at a man if her desires may be stirred, regardless of whether he be blind or seeing. In fact, she should not, in that case, even look at pictures in the newspapers or in the movies if such may occur.

Shaikh ibn Jibreen

Islamic Fatawa Regarding Women - Darussalam Pg.278-279