A<unk>  (also known simply as a<unk> ") is a corrective, cosmetic, or therapeutic<unk>  usually placed on the cornea of the eye. Modern<unk> es were invented by the Czech chemist Otto Wichterle, who also invented the first gel used for their production.<unk> es usually serve the same corrective purpose as conventional glasses, but are lightweight and virtually invisible — many commercial<unk> es are tinted a faint blue to make them more visible when immersed in<unk> eaning and storage solutions. Some cosmetic<unk> es are deliberately colored for altering the appearance of the eye.
It has been estimated that 125 million people use<unk> es worldwide (2%), including 28 to 38 million in the United Statesand 13 million in Japan. The types of<unk> es used and prescribed vary markedly between countries, with rigid<unk> es accounting for over 20% of currently-prescribed<unk> es in Japan, Netherlands and Germany but less than 5% in Scandinavia.
People choose to wear<unk> es for various reasons. Many consider their appearance to be more attractive with<unk> es than with glasses.<unk> es are less affected by wet weather, do not steam up, and provide a wider field of vision. They are more suitable for a number of sporting activities. Additionally, ophthalmological conditions such as keratoconus and aniseikonia may not be accurately corrected with glasses.
Contact lens
Ocular prosthesis
Conjunctivitis surgery
Corneal ulcer surgery
Myopia surgery
Eye surgery
Hyperopia surgery
Recurrent corneal erosion surgery