My optometrist recommended these drops and they've been a life saver! I live in the high desert where there's low humidity, and my eyes get so dry. These ones have some oil in them so they last longer than the saline type. I've been using them twice a day for a few months now. They never burn. Always feels like lotion on my eyes, in the best way! There's no smell or taste with these. They are single dose vials, which creates a lot of waste. But preservatives can be irritating on dry eyes, so it's for the best.