RECOMMENDED BY PROFESSIONALS. PRESERVATIVE-FREE - Thealoz Duo Gel is a preservative-free solution, making it gentle for even the most sensitive eyes. SUITABLE FOR DRY EYES - Thealoz Duo Gel is ideal for the dry eye from a range of causes such as air conditioning, dry environments, working with computers, hormonal dry eye, and wearing contact lenses. EASY TO APPLY – Thealoz Duo Gel comes in single dose unit droppers which can be easier to use than eye ointments. ADVANCED COMBINATION - An advanced combination of Sodium Hyaluronate, Trehalose & Carbomer – for lubrication, hydration, and protection of all dry eyes – the ideal choice for all dry eye sufferers, whatever the cause. LOCKS IN MOISTURE - Thealoz Duo Gel is a combination gel that helps to soothe and cool dry eyes. It protects, hydrates and lubricates the eyes to provide long-lasting lubrication and relief of dry eye symptoms. More viscous than daily eye drops, Thealoz Duo Gel is ideal for night-time hydration to keep your eyes comfortable until morning.