Thought I would add my two cents for what it is worth. I have to avoid eye drops with Carboxymethylcellulose (basically all of the Refresh Tears brand) as they feel great at first but then increase the dryness and cause me to use drops hourly throughout the day, they make my eye painfully dry. It was like a miracle when I stopped using them and switched to a different brand, now I only use drops around 4x/day.