To me, there's nothing that ruins a beautifully done eye makeup look more than red eyes. These eye drops will make the whites of your eyes pop, and perfect your overall makeup. This is an absolute go-to in my makeup bag. I discovered this a little over a year ago and decided to try it. It works a lot better/faster than other redness relief eyedrops that I have used in the past. It does have a bit of a sting to it, but you get used to it, and I think it feels pretty good now. The value is AMAZING, I bought my first bottle around a year and a half ago for around $6. I use this stuff quite regularly and am just now getting to the last few drops. A true staple! The only reason I gave this 4 stars and not 5 is that the super whitening effect does not last more than a few hours for me, but it does keep your eyes overall moisturized throughout the day.