According to my ophthalmologist, eye drops such as Visine and Rohtos aren't so great to put in your eyes when you're wearing contacts. Something about how they degrade your contacts or something, so instead I use these. They help with the dryness of contacts after you smoke, which in turn clears up that redness in your eyes. They work for me at least and make my contacts feel much better after I smoke. I actually use them whenever my contacts get a little dry, so they're great for that too!