Infrared contact lenses have been specially processed so that they can be used to detect invisible ink marks on marked deck of cards. The wave band of invisible light is between 400nm and 700nm. Something is in this wave band can be seen by our naked eyes. The wave beyond 700nm is called infrared light and the wave blow 400nm is ultraviolet light. If something is in the wave band of infrared or ultraviolet light, we can??t detect them through naked eyes. We have to make use of some devices to detect the special light.
Marked cards become more and more popular in poker cheating gambling. With the help of these cards, players can win more easily in gambling. But marked cards are processed with invisible ink so we can??t see the luminous marks on cards through our naked eyes. We need to wear infrared contact lenses. By these lenses, you can see the marks clearly.
From appearances, there is no difference between invisible ink contact lenses and ordinary contact lenses. High quality contact lenses has low water content so that these contact lenses are not easy to let your eyes dry. Even if it??s your first time to wear contact lenses, you won??t feel like that there is something strange in your eyes.
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