How Long Will a Prosthetic Eye Last? There is no definite answer to this question. The life of the ocular prosthesis depends on your age, the type of implant used at the time of surgery, reason for the eye loss and age of the plastic itself. Usually the slow atrophy (loss) of fat deep in the orbit will require replacement of the prosthesis. Thus we recommend that you be checked semi-annually by your Ocularist to determine that there are no scratches, surface deposits, or anatomical changes. Back to Helpful Information