وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ عَنْ سَالِمِ بْنِ عَبْدِ اللَّهِ، وَسُلَيْمَانَ بْنِ يَسَارٍ، أَنَّهُمَا كَانَا يَقُولاَنِ فِي الْمَرْأَةِ يُتَوَفَّى عَنْهَا زَوْجُهَا إِنَّهَا إِذَا خَشِيَتْ عَلَى بَصَرِهَا مِنْ رَمَدٍ أَوْ شَكْوٍ أَصَابَهَا إِنَّهَا تَكْتَحِلُ وَتَتَدَاوَى بِدَوَاءٍ أَوْ كُحْلٍ وَإِنْ كَانَ فِيهِ طِيبٌ ‏.‏ قَالَ مَالِكٌ وَإِذَا كَانَتِ الضَّرُورَةُ فَإِنَّ دِينَ اللَّهِ يُسْرٌ ‏.‏

Yahya related to me from Malik that he had heard that Salim ibnAbdullah and Sulayman ibn Yasar said that if a woman whose husband haddied feared that an inflammation of her eyes might affect her sight orthat some complaint might befall her, she should put kohl on and seeka remedy with kohl or some other cure even if it had perfume in it. Malik said, "If there is a necessity, the deen of Allah isease." Translation Not Available

Book Ref: Muwatta Imam Malik Book 29 Hadith 1271
Web Ref:  Muwatta Imam Malik Book 29 Hadith 106