What is Thealoz Duo? Thealoz Duo is used to treat the symptoms of dry eyes. It combines Trehalose (as in Thealoz) and Sodium Hyaluronate (as in Hyabak), providing you the best of both products.   Having dry eyes can feel like a burning, gritty sensation if the tears produced are not adequate enough or not frequent enough.  The symptoms of dry eye include Redness in the eyes A dry, grainy feeling in the eyes Irritation when wearing contact lenses Blurred vision and/or sensitivity to light (Photophobia) Excessive watering Eyes that feel tired What are the benefits of taking Thealoz Duo? Thealoz Duo is a preservative free eye drop designed to lubricate, hydrate and protect the surface of the eye.  It is also a hypertonic solution which can restore the natural balance of the eye. The drops can be used for up to 3 months after opening and can be used whilst wearing contact lenses. How to use Thealoz Duo? The drops can be used as and when needed.  The bottle is a compact, portable size which contains 300 drops and is easy to squeeze.   Always read patient information leaflet provided or information on the product packaging.  If you are unsure if the product is right for you before using, consult with your GP or Pharmacist.