How to Read Playing Cards Marked with Invisible Ink You’ve probably heard of UV contact lenses before. It is a special type of marked playing card contact lens that can read playing card marks within 3m. Just like a regular pair of contact lenses, it will not change your original eye color. What’s more, UV contact lenses are more concealed and flexible than sunglasses.
When it comes to the quality of UV contact lenses, there are three categories here. The cheapest contact lenses are best for brown or black eyes, as they won’t change eye color, but aren’t strong enough to read marked cards. Secondary contact lenses and primary contact lenses are suitable for different eye colors, and both can see clearly.
Generally speaking, secondary contact lenses can be used for more than 8 months, and high-quality contact lenses can be used for more than 2 years if they are well preserved in pure water.
What’s more, if you have myopia, we can also specially design myopia contact lenses for you. The most important thing we should pay attention to is the feeding method. We should soak the lens with pure water instead of care solution.