Intraocular lens (IOL) placement is the most common eye surgical procedure performed. An IOL is implanted in the eye to replace the crystalline lens that may have been occluded by a cataract or to change the optical power of the eye by adding a synthetic lens in the presence of the natural lens. Previously made of Polymethylmethacrylate (PMMA), an inflexible material, intraocular lenses are now made with flexible plastics. Although many IOL placements are monofocal; there are other types of intraocular lenses, such as multifocal intraocular lenses, accommodating intraocular lenses, secondary intraocular lenses and Phakic or Pseudophakia intraocular lenses (PIOL), including anterior or angle supported PIOLs and posterior or Sulcus supported PIOLs. Many Phakic intraocular lenses are not approved by the FDA and are still under investigation. Be sure when choosing a vendor that this is taken under consideration, FDA approval assures a standard of safety. Some eye surgeons suggest using a different IOL in each eye; for example, a multifocal in one eye to help with close up vision like reading and an accommodating IOL in the other eye to help with distance or midrange vision. This gives the patient the best of both worlds.