The right of sight is that you lower it before everything which is unlawful to you and that you take heed whenever you look at anything.

وَأَمَّا حَقُّ بَصَرِكَ أن تُغْمِضَهُ عَمَّا لا يَحِلُّ لَكَ و تَعْتَبِر بالنَّظَرِ بِهِ.