Not usable with glasses and worthless in any case
There are no directions and the replacement shields don't hold whether  you  put them on the inside or outside of the frame. We even tried some double sided tape which didn't work either. . The slot in the films suggests that they are meant to be attached from the inside of the frame.  If you look at the pictures you can see why they are uncomfortable and impossible to wear with glasses even if you could get the film to stick to the frame.  Worthless.
Rating: 1 stars