How to read poker cards marked with invisible ink You may have heard of UV contact lenses. A special type of mark card contact lens that can read the mark of playing cards within 3m. Just like regular contact lenses, they do not change your original eye color. Additionally, compared to sunglasses, UV contact lenses are more opaque and flexible.
Regarding the quality of UV contact lenses, there are three classes ES. is not enough. Second-class and top-class contact lenses have different eye colors and both can read cards clearly.
Generally speaking, grade 2 contact lenses can be used for more than 8 months, and top quality contact lenses can be used for more than 2 years if stored well in pure water.
In addition, if you have myopia, we can also specially design contact lenses for myopia. The most important thing we should pay more attention to is the storage method. You should soak the lens in pure water, not the care solution.
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