I got a letter from my cousin Nirmala, about her mother. I reproduce it verbatim unchanged. I have only highlighted a few things.
"Periodically she gets visions (hallucinations) with audio. About bhajans, gods and goddesses, patterns on the ceiling, monsters, and now insects big and small on her bed and clothes, plastics hanging from the ceiling, and the cupboards becoming buildings and falling on her. She tries to get off the bed on her own and go out of her room. She can barely walk with the walker and one attendant to the toilet.
She is aghast that we cannot see these things. She also sees a child and a man standing in the corridor. She has lost orientation her room and is worried about how to go out of it and come back.
Is fairly lucid and clear while speaking to us and neighbors.
She has back pain and knee pain off and on and not much strength in the legs. Cannot read or write legibly, cannot read.
Poor hearing - hearing aid not satisfactory; Poor eyesight and eye doctor has said no more can be done for her macular degeneration. Obviously, the lady is seeing things which others do not, because, they do not exist - a phenomenon called hallucinations. Hallucinations are reported in people with normal eyesight sometimes caused by some medications, drugs, alcohol withdrawal and some other events.This is a unique situation where a person with a poor eyesight starts seeing things very clearly and these are not visible to the others. This is known as Charles Bonnet syndrome. Charles Bonnet was a Swiss naturalist and a good observer. He was the first person to describe this unusual syndrome. This is commonly seen in elderly patients with a poor vision and appears and disappears without warning. These hallucinations can be common, mundane or funny and rarely threatening. The images could be in black and white or in color and can even be clearer than normal! The person seeing them fully believes them to be real! Sometimes they seem to fulfill a unfulfilled desire - like a lady who repeatedly 'saw' her deceased husband and a childless lady who 'saw' a boy and a girl as her children (she was longing to have children). They are able to 'see' these people / events even while speaking to others (who obviously cannot see them)!Sometimes the images may be of animals and inanimate objects like boats, houses. They may even be in the form of spinning lights!One person could see cartoons in his scotoma - a completely blind part of his visual field!
These therefore are like usual hallucinations - probably the patients are 'filling in' as they are blind! What is astonishingly different in these people is that the filling in is done by using high level stored memories - like pulling out an old album and seeing the images with great clarity and in a great detail! These stored internal images therefore make up for the otherwise lack of vision = but they can never substitute the real vision! To quote Shakespeare 'You cannot cloy the hungry edge of appetite by bare imagination of a feast". These perceptions are probably an end result of an dynamic interplay between sensory signals and high level stored information about the visual images from the past! The higher visual centres therefore probably substitute the 'best fit' to the lower centres which have failed in their duty of enabling the person to see normally (for whatever reason, these persons always have a poor eye sight).
Why I am enamored by this syndrome is because I encountered it in my own father - a very intelligent and accomplished doctor know for his clarity of thought and judgement. During the final phase of his life, he experienced these images which I later realized were due to the Charles Bonnet syndrome . He was a very well read person. One day he was very excited - he called me to tell me that he is able to read the front page of the New York times very clearly and believed it to be a miracle! Only there was no New York Times and he was a;most totally blind! Only when you experience these in a close friend or a relative you understand how important to identify it in the first place. The lady mentioned above is my father's sister.
There is no need to treat this if the patient is able to rationalize. That was what was done successfully to both my father and his sister.
Coming back to the story of my aunt , my friend, Dr. Gurudutt Kamath opined thus
with poor eye sight and description of vivid pictures it looks like Charles bonnet syndrome
I reassured my cousin about her mother and wrote to her
"Dear Nirmalakka
My dad also had it. These are NOT hallucinations. They are OLD IMAGES STORED IN THE BRAIN released due to some unknown reason ( like seeing old albums). Unfortunately the patient thinks it is really happening! Patient counselling is the best way out of it. This even has a name - Charles Bonnet syndrome. It is otherwise harmless. It does not indicate stroke. It poses a challenge to the caregivers.
Raghu
Both my aunt and my father improved. But the Charles Bonnet syndrome continues to exist and haunt people out of the blue!