al-Fadl bin Dakayn, Abu Na'eem الفضل بن دكين أبو نعيم الملائي · Chapters on Medicine

"Indeed the best of what you treat is As-Sa'ut, Al-Ladud, cupping and laxatives.' And the best of what you use for Kuhl is Ithmid, for it clears the vision and grows the hair (eye-lashes)." And he said:" The Messenger of Allah (s.a.w) had a Kuhl holder with which he would apply Kuhl before sleeping three in each eye."