"I'll tell you, I'm 76 and i have Sjogren's and it is first product i have found that really helps. I can work outside, around the house very comfortably now. The key is to USE it and it will work. My Dr. at Duke, Dr. Houser, told me at my last visit she has never seen my corneas look so good. She is very comfortable to prescribe it to other patients as she knows the people involved in the clinical trials.