I was kinda hoping you would elaborate in your own words and not copy and paste, but...please dont get me wrong, i am intrigued by the fact that only there eyes are allowed to be shown!
Lots of religions believe that to cover yourself is chaste, nuns outfits can quite resemble those of muslims, what i find difficult to comprehend is why to cover the face?
People read expressions through the face...in fact in sometimes is a much better form of interaction than words! I could find it very offensive to have a conversation with someone when i cant see there face.