Artelac Nighttime Gel are for those needing a little Artelac Nighttime Gel are for those needing a little more relief for their dry eyes caused by chronic tear dysfunction, either during the day or at night.They are also designed for those who have received a formal diagnosis of dry eye caused by hyperevaporative lipid-deficiencyor eyelid dysfunction. Artelac Lipids & Artelac Nighttime Gel support all three tear film layers. Their components work like natural tears to help strengthen and support the tear film by sealing in moisture for lasting relief. Artelac Nighttime Gel supports all three tear film layers. It\'s components work like natural tears to help strengthen and support the tear film by sealing in moisture for lasting relief