Types of Implants
There are a number of different types of implants used by the surgeon to replace part of the volume of the eye when the globe is removed. These include varied shaped acrylic implants and, more recently, porous implants such as Hydroxyapatite, Medpor and Bioceramic have been used to facilitate greater movement of the prosthetic eye. Your surgeon will advise you as to which is the most suitable implant for your particular situation.
Porous implants allow for vascular ingrowth over a period of several months to a year creating a stable implant that does not migrate out of position. A number of years ago, it was common to place a peg into the central region of the porous implant to maximize movement to the prosthesis. Unfortunately, numerous complications became evident such as breakdown of the conjuntival tissue directly surrounding the peg area. There also proved to be significant increase in socket discomfort and discharge. On occasion, the prosthesis would actually rotate out of position and an audible "clicking" sound could be heard due to the extreme movement of the prosthesis. Currently in our region, we estimate that less than 0.5% of patients and surgeons are opting for the pegging portion of the procedure. Most patients are very satisfied with the movement of the artificial eye created by the porous implant alone.