.  Contact lens users have to be aware that if they do not follow strict aseptic precautions while handling and  using contact lenses is that it can lead to a severe complication namely, corneal ulcer. So remember to wash you hands with soap every time you handle contact lenses, to keep the lenses in the solution provided and to wash the lenses with the solution before applying it over the eyes. If you have any irritation immediately remove the lens and report to the eye doctor.