http://www.lasiksurgery.com/amp.php - An intraocular lens is in essence foreign to the body, and has to be made of a material that will not be rejected by the body. Generally, an IOL is made up of PMMA. Other materials are also used in intraocular lenses, but these are often more expensive and not covered by Medicare. In essence, there is no reason why you should invest in IOLs that are not made of PMMA or something similar.