They have offered this promotion before and I have received my free glasses. They are good quality and the PRX worked for me perfectly.
They have hundreds of different frames to choose from. Some designer glasses won’t work as part of this promotion, but there are still many super cute frames to choose from.
Log onto their site and add your favorite frames to your cart. (Choose your glasses ahead of time, as the site will be very busy and slow come noon). Then enter your PRX, and plug in the code FreeGlasses518 to get your free glasses!