A small incision is made into the eye, the cataract is removed and replaced with an artificial lens. Artificial intraocular lenses, or IOLs, replace the eye's natural lens that is removed during cataract surgery. These days there are a number of different types of IOLs, all intended to serve a different medical need, such as IOLs for Astigmatism, Multifocal or Monovision and more. It is important for the patient to discuss his or her need in depth before choosing a lens. The procedure is performed under local anaesthetic as a day case.