The material of an ocular prosthesis manufactured at Beryl Carvalho, Eyes Alive, is a conventional heat-curing material, Poly Methyl Methacrylate (PMMA). The material needs to be professionally maintained through high speed buffing with various rubbing and polishing compounds and this needs doing at least annually. When polishing becomes necessary the patient will sometimes feel it. They feel itching and scratching on or in the eye lids; have an increase in discharge or even a feeling that the eye dries out more easily; the eye becomes dull looking; as well as noticing a change in the overall appearance of the eye prosthesis in the socket. This process may develop over time and be so gradual that a patient doesn't really notice it.