Implantable contact lenses (otherwise known as phakic IOLs) are used to correct very high refractive errors where laser treatment may be unsuitable. An intra ocular lens is inserted through a small incision in the cornea and placed behind the iris and in front of the natural lens. This differs from Lensectomy in that the natural lens is not removed from the eye. As with Lensectomy, the procedure is performed using local anesthesia and intra-venous sedation.