A contact lens is a corrective, cosmetic or therapeutic lens usually placed on the cornea of the eye. About 125 million people use contact lenses worldwide (2%) including 28-38 million in the United States and 13 million in Japan. People choose to wear contact lens for various reasons. Many consider their appearance to be more attractive with contact lens than with glasses, less affected by wet weather, do not steam up, and provide a wider field of vision. Contact lenses are thin,