Stays stuck
Got these to lift a pair of plastic frame bifocals that I ordered online and hate to ask someone local to adjust.  They raised them up to the perfect height for reading.  I don't think they're very noticeable, and almost a year later, they're still stuck on.  I will admit that I don't wear that pair very much, but they have stayed on, even through cleanings.  They worked for my purpose, so I'm happy with them.
Rating: 5 stars