Not had a single problem tbh. But that doesn't mean a great deal as some people struggle with them especially for things like going down steps. The main thing I find is that you can't lie on the settee and watch the tv (at least if it is normal height) as that is the near vision and there is slight blue fringing on text on tv if you look at the wrong angle. You probably also need larger frames in the vertical measurement to give decent spacing for the focus zones. Mine are pretty much top spec lenses though.