The handling of plastic contact lenses can be simplified if they are laser marked. This helps to avoid confusion of left and right and you can tell before inserting whether the lens is wrongly inverted. Vision is not affected by the marking, as it is located in the edge area of the lens.
A CO2 marking laser with low energy level creates inscriptions in an engraving or melting process. Usually there are numbers or letters applied on contact lenses, but ring marks are also possible. To meet hygienic standards, it is important that the marking has minimal impact on the substrate to prevent the adhesion of additional microbes.
With a speed of only 18 milliseconds, the marking process is even shorter than the blink of an eye!