Back luminous marked cards is a kind of invisible ink marked cards and there are several types poker devices can used to read back marked cards, such as infrared contact lenses, IR glasses and poker scanning camera. While, we will pay more attention to black infrared contact lenses in this article!

The infrared contact lenses including different types as black IR contact lenses, blue IR contact lenses, green contact lenses, grey contact lenses and brown infrared contact lenses. We also can divide infrared contact lenses according it's specification as 4mm, 5mm, 6mm,7mm,9mm......

It is means that different people suit for different color infrared contact lenses. So if you have black eyes, the black infrared contact lenses would be the best choice for you as it wouldn't change original color of your eyeball. But if you think it doesn't a matter, you also can choose other color contact lenses. And all infrared contact lenses in our company wouldn't hurt your eyes! By the way, after you use it, don't forget to keep it in the pure water.