I am predisposed to dry eyes, and I just got LASIK so my dry eyes are more pronounced. I've been going thru so many eye drops, up to 10 dollars a day! And I have to use preservative-free drops, because regular drops irritate my eyes. I'm pretty happy with the Bausch & Lomb Soothe eye drops. They lubricate longer than the preservative-free Refresh Optive or preservative-free Systane Ultra,.. The drops aren't too viscous, like a gel drop, so my vision isn't blurry after one or two blinks after application. Each dropper is a generous 0.02 oz, so one box lasts me longer than the other brands. So far the only drop better than this one is Oasis Tears Plus, but it is very expensive, costing twice as much! The Oasis Tears Plus is better because I don't get that evaporating feel that I feel with all the other eye drop brands.