Product Description Thealoz Duo Eye Drops thickens the tear film, to encourage more hydration for the eyes. Sodium hyaluronate helps the eyes to retain moisture by thickening the tear film, providing lasting relief from moderate to severe dry eye. The moisturising effects of these eye drops have been clinically proven to last for at least 4 hours, these drops can be reapplied as and when required. These soothing eye drops are ideal for excessive screen use, and drying environments such as air conditioned spaces and central heating. If you have dry eyes, blurred vision, stinging eyes or a condition such as blepharitis, these soothing and hydrating eye drops are the ideal way to reduce those symptoms. This bottle will last 3 months after opening. Need more optical advice help? Ask our optical experts