Our latest infrared contact lenses are suitable for all kinds of invisible ink marked cards. And we have different colors of luminous ink contact lenses. These latest contact lenses are suitable for someone who likes playing poker games with invisible ink marked cards and contact lenses. There are different sizes of contact lenses in our company. Poker players cannot play marked cards game well if they haven't worn contact lenses. Because luminous ink markings on back of marked card cannot be seen by our naked eyes. Once they wear the contact lenses, they can see the invisible ink marking on the back of poker cards. What’s more, it is better for you to wear the IR contact lenses or glasses beforehand for adaptation before you play the poker games.