Thanks for your comment @alphasteem. I also tried Systane and Refresh after my LASIK surgery, and I noticed that these drops provided relief for my eyes for about 2 minutes! Haha! That's why I decided to switch to a preservative free one (Hylo), and I actually felt like it helped me and I was not dependent on the drop. However, I do have many patients that love either the Systane or Refresh and use them as needed. Keep it mind that after laser eye surgery, your corneal nerves are severed. It usually takes about 4-6 months for the nerves to regenerate, and your eyes won't feel as dry anymore! Some drops will work for some people, and not others, depending on the composition of their tear film!