I came across this video and this is the first time I've heard about this condition. It only occurs during vision loss, and the first thing that hit me was its similarity to tinnitus. Basically the brain starts to create phantom visions and as we all know tinnitus is phantom sounds from the brain often after hearing loss. It seems like this is a general phenomenon where the brain seems to create sense inputs when it's losing them.
Have someone studied similarities between Charles Bonnet syndrome and tinnitus? Because to me it looks like the same mechanism just with different senses.