I didn't try the novelty contact lens yet, but I can give you some information about it. The novelty contact lens is also called cosmetic lens or Plano lens. It's a fashion item that made by soft plastic to change the appearance of eyes, especially enhance the beauty of the eye. Unlike the corrective contact lens, it could decorate the eye instead of change the eye vision. That is to say, it's not safe to wear the novelty contact lens frequently in daily life. However, you could wear this kind of contact lens with risks. Firstly, there are various colors of novelty contact lens are available, thus it would block vision if the design is less transparent. And it would irritate your eyes when inserting the contact lens at the first time. It takes a certain period to adapt it by your eyes. On the other hand, it's not suitable for daily usage that not recommended by the eye doctor. And like other contact lenses, sleeping in novelty lenses is a serious risk of safety. It would cause damage of the eyes if the user couldn’t follow the proper contact care.