Can't work miracles, can start conversations
It's sort of effective, but it's not a miracle worker. Poorly fitted glasses (like mine) won't stick forever, although they do slide down *less* often. But when I'm out in the barn, sweating and moving around a lot, I may as well not be using it, because it can't stick to sweat at all. If you have relatively well fitted glasses and you're working inside, this might be worth it for you. I think the biggest part of its appeal is the novelty - if you apply it in front of people you definitely get some interest and might spark a conversation.
Rating: 3 stars