Implantable Contact Lens (ICL) surgery is an option to correct short sightedness for patients under the age of 40 who are unsuitable for laser vision correction and whose natural lens still retains ability to change focus between distance and near.
A lens implant is inserted into the eye to sit in front of the natural lens, which is left in place. It is similar to having a contact lens inside the eye. The focus power of the lens implant supplements the natural lens and is calculated to correct your refractive error to give good distance vision without glasses.
This surgery is less well suited to correcting long sightedness because such eyes are often smaller, with less room to safely place an ICL.