These are working perfectly for me.  I mount my iphone to an air vent in my car and I am , with just a slight tilt of myhead, now able to glance at google maps, etc.  and actually read what is on the screen, where before I had to wear my 'cheaters' reading glasses for this., which was very problematic on sunny days.  I had  concern at first that 'polarized' glasses might interfere with me reading my iphone, but I personally have had zero problems reading the iphone screen with the bifocals.
Love these!