pigmentary epithelium, pigmented epithelium. that made of cells containing granules of pigment. posterior epithelium. the single layer of epithelial cells on the back of the cornea, between stroma and aqueous humour; the corneal endothelium.retinal pigment epithelium. see retina.sense epithelium, sensory epithelium. see neuroepithelium (1).he single layer of epithelial cells on the back of the cornea, between stroma and aqueous humour; the corneal endothelium. retinal pigment epithelium. see retina. sense epithelium, sensory epithelium. see neuroepithelium (1).
Since at least the mid-19th century, doctors have known that silver or silver compounds can cause some areas of the skin and other body tissues to turn grey or blue-grey. Argyria occurs in people who ingest or inhale
The diagnosis was argyria, a blue-black tinting of the skin and mucous membranes caused by a build-up of silver. Numerous similar cases have been reported in recent years.2,3 In argyria, silver deposited in the body reacts with the sun through a process similar to that of the development of a photographic negative. This leads to permanent discoloration of the skin. Changes may be seen in the eyes, lips, and nose as well. The condition was even more common in decades past, when CSP was an accepted medical treatment.