The Implantable Collamer Lens (ICL) is an intraocular lens (IOL) that is used to correct refractive errors or spectacle power such as myopia, hyperopia, astigmatism. It is also known as phakic ICL. During the procedure, the eye surgeon places the intraocular lens inside the eye between the iris and the natural lens.
The implantable lenses function as the contact lenses for correction of nearsightedness, but the phakic IOLs work from within your eye instead of sitting on the surface of your eye.
ICL can be considered permanent contact lenses which are specially designed to be surgically placed inside the eye. These lenses are made of Collamer, a collagen copolymer. Collagen is naturally present in our body and this makes ICL compatible with all the structures and parts of the eye. It may remain and function in the eye for as long as needed.