I am so happy I decided to give these a try. They work GREAT! They clip on and stay on, they cover my lenses (which are rectangular) and they flip up easily without falling back down or loosening the whole setup. The yellow lenses help me a lot with night driving and I'm hoping they help when its raining. The dark lenses are great too. I need sunglasses if there's any glare and these are terrific. It's great to not have to carry two sets of glasses around. I'd recommend to everyone.