Infrared contact lenses, is also called IR contact lenses for short. It is one of the playing cards scanner fast and cheapest cheating device in the world. If you want to know the poker face (suits and values) when the poker cards face down, how will you do? One of the methods is to wear infrared contact lenses to read the invisible ink marked cards. Wear the contact lenses will help you to see the mark on the back clearly. And the marks ‘ pattern can do as you want.. We can do marks on both plastic cards and paper playing cards. There are three kinds of diameters for color part: 4 mm just cover the pupil, 7mm and 9mm cover the iris.