This product is amazing. I had very bad allergies the past two weeks. My eyes were irritated and itching non-stop for two weeks! I tried the antihistamine drop called Zaditor. It didn't work and made eyes worse with itchy. Sometimes, I feel like I can't open my eyes when sleeping after using Zaditor. I tried the regular Visine and it does a great job with the redness, but my itchy and watery eyes comes right back. I got desperate and bought Visine AC, I think I tried a different version of it last year and it work. It really burned at first. I was worried about the burning. Then, a miracle happened, my itching finally stopped after two weeks! But my redness is still there though...I am going to try it a little longer to see the results.