LT - 5 months ago, Verified purchaser
I have dry eyes, and my opthalmologist wants me to use lubricant eye drops at least twice daily. Refresh Optive Sensitive has been very helpful; if I skip a dose I feel the difference. My eyes are no longer tearing, and unless I skip a dose, I no longer have that awful feeling that comes when my eyes are terribly dry. The best thing about these is that I feel confident that I am not doing any damage, as these are preservative-free. I've been told by multiple eye doctors that it's OK to use a vial for 24 hours, as long as it stays clean. I open 1 vial, use it, then put the cap back on, turning it to a 90 degree angle from how it started. That way I know which one to use next. After the 2nd use, I throw it out. At that point I usually have used it up. These are wonderful!