Review on Yodo Flip-Up Clip-On Polarized Sunglasses For Men And Women - Ideal For Driving, Fishing, And Outdoor Sports, Fits Over Prescription Glasses by Farhad Cantu

The problem with these is that it's really hard to open the clip. The part you need to squeeze is too short, my finger can't hold it easily. I really need to concentrate to get the clip to open so I can slide it over my glasses. That makes it way to cumbersome to use except in the worst conditions. Besides that I think the clips are longer than they need to be. They get in my vision which is annoying. Finally, the unit itself is quite heavy, heavier than my glasses. I haven't tried any other brands so I don't know if they are heavier or lighter than what is normal.