Could ghosts sometimes be Charles Bonnet Syndrome?

Charles Bonnet Syndrome is the name given to explain the situation when people with sight problems start to see things that they know are not real.
Sometimes called visual hallucinations, the things that people see can take all kinds of forms, from simple patterns of straight lines to detailed pictures of people or buildings. These images can be enjoyable, frightening and/or sometimes upsetting. It can be that the sufferers just see a latticework of lines as if the room is covered in strands, but it can also take on a frightening guise when people actually see other human beings that aren't there.
Could this be an explanation for SOME supposed apparitions?. Especially when these visions actually appear as solid flesh and blood.
It is certainly another layer to add to the whole spectrum of ghostly sightings. That said, the sufferers usually do know they suffer from this condition.