Pigment in cellular membranes on intraocular lens implants.

Cells with protoplasmic pigment granules on the surface of intraocular lens implants can be divided by their basic nature into histiocytes, epitheloid cells, giant cells, small fibroblast-like cells, iris melanocytes, pigment epithelium, and probably corneal endothelium. All these cells are part of a cellular membranes that have been observed on lens implants at times between eight months and three and a half years after lens implantation.