Not to freak you out or anything, though I knew an old guy (in his eighties) awhile back that invited me to his home while I was visiting relatives. He was entirely blind at this point due to other reasons that I'm not referring to what you are stating. However since you are considering the psychosomatic element, the man was telling me of an episode before he became blind that involved the perception of an alternative dimension. In one eye he couldn't see and in the other he claims to see people moving about their daily lives.
At the time he was fairly lucid and didn't show any "out of it" character, even if he was in fact preoccupied with constructing a remote controlled device that resembled a flying saucer, and could in fact fly as such (or so he claims. . .) The guy was in fact brilliant and had been involved with electronically wiring skyscrapers, so he knew what he was doing and set up regular rocket model thrusters that would be triggered electronically.
Anyway his dementia type of experience went away after he suggested getting vitamin supplements (possibly B vitamins, such as niacin). I couldn't get a thorough explanation about his health condition though from a book he wrote and published privately (that I have) he seems to have had various encounters with the vision of his mother (whom died while he was young) and these visions he claims to have occurred like some Deus ex Machina throughout periods of his life. Whether or not he was simply making things up (or didn't honestly know he was) they occurred throughout his claims of events such as being in concentration camps (he was a Polish immigrant) or abandoning a sinking ship and being in the water for extended periods of time surrounded by sharks.
Either way it is true that stress can provoke things like epilepsy and other neurological conditions, and it may be some short intermittent experience that will go away after awhile. The brain is a strange organ.