Great Product but watch out
First...If you do not apply a generous amount of liquid when attaching to glasses...the darned thing falls off....you lose one side or the other.  Second, you cannot remove them and apply to another pair.  I went online with the firm (contact us) and never got a response...but the advertising says they pretty much are portable; being able to move from one set of glasses to another.  I soaked mine, did everything I could to remove one lense to another pair, and it was truly a no-go.<br /><br />Had it not been for the above two areas of concern, they would receive 5 starts.  But lack of communication and the above merits 3 stars.
Rating: 3 stars