Some customers tell me that the marked cards for contact lenses and sunglasses to see is known to many people now so they are looking for new products with new technology.
In fact, in addition to the contact lenses marked cards and bar code marked cards, we have also the IR marked decks. There are IR marks on the marked playing cards for only IR camera to read. The scanning camera can't scan any barcode and the contact lenses can see any marks on the back on such IR marked cards.
The detector that can see the normal infrared marked cards couldn’t detect this special IR marked cards either. Thus you don’t need to worry about being detected by others' contact lenses or sunglasses when playing pokers with these marked cards. With a IR camera installed in other daily item, you can see the marked cards clearly on a screen.