Personally, they didn't work at all for me. I have a serious issue with dry eyes and my eyes barely produce moisture. This particular eye drop made my eyes red, painful, and caused me to have crusts, as if I had an allergy.

I have severe dry eye (sjogren) and this is the only thing that helped me. It's like simple drops, it doesn't leave an unpleasant feeling in the eyes but it does its job more than enough.