Glasses that see invisible ink marked cards

GS marked cards factory sells different kinds of invisible ink clear glasses that can see invisible ink marked cards, such as infrared sunglasses, marked playing cards glasses and luminous ink glasses kit.
All of these marked playing cards with glasses have no difference from common sunglasses. Marked cards sunglasses do not protect your eyes from the sun but also help you used to detect invisible ink marks. Furthermore, marked playing cards with glasses can be customized according to your requirements.