Contact lenses for back marked poker, is invisible. When you wear it, just like wear nearsightedness contact lenses, others could not know you wear something. And we do the mark on the back of poker by special ink, without the contact lenses, you can see nothing, while you are wearing the lenses, you can see the mark clearly.

    In order to see the marks clearly, we suggest you that use the under the fluorescent lamp. If you want to use it under the sunshine, please tell us advance, cause the poker should be processed specially.

   Product Parameters:
     Lens diameter: 13.8 mm
     Center thickness: 0.07 mm (-3.00D pm)
     Center wideness: 5mm, 7mm, 9mm
     Base curve: 8.4 mm
     Oxygen permeability coeffcient: 9.0DK
     Material: PMMA has been ester hydroxy
     Registration No.: Medicines (Approved)