The Thealoz Duo Gel is ideal for dry eye sufferers. The Thealoz gel helps add moisture by lubricating the surface of the eye. The gel version has a long-lasting effect compared to the drops, but people often prefer to use the gel for nighttime use and use the drops during the day. Dry eye symptoms can be caused by outisde factors like wind, smoke, dust, sunny or cold conditions, dry heat, air conditioning or long hours in front of a computer screen. Suitable for moderate to severe dry eye syndro