Sunglasses are the most fashion style in all the eyewear accessories which are made of one pair of eyeglasses and one pair of frame. They are specially for protecting your eyes from the sun. But in the casinos games, they also can use for detecting luminous marked cards.
Spy poker glasses are processed with infrared radiation and UV, which remain the same appearance and the same function as common one. No matter what brand of luminous marked cards, our glasses plastic see through playing cards marking with invisible ink.
Those decks are marked with invisible luminous inks, naked eyes cannot see any different between those and normal standard cards, because the luminous ink playing cards reflect infrared band that human beings cannot directly see it. They can use marked playing cards glasses or contact lenses marked cards to see the invisible luminous ink marks.