Reader ( poker )

1) Marked cards, particularly those marked with special luminous ink that can be seen only by someone wearing special glasses or contact lenses sensitive to a particular portion of the spectrum. Also known as luminous readers.
2) Pink eye (Infrared (pink- or red-tinted) contact lenses worn by a thief to see the markings on luminous readers, cards marked with special luminous ink that can be seen only in infrared light.)