Wow! Your poor Dad. Last year, I (not her medical professionals) diagnosed a visually impaired nonagenarian family member with Charles Bonnet Syndrome. She was seeing both happy and frightening things: sweet birds entering her room, a theatre production, and a robbery. With antidepressants and more sleep time, the hallucinations decrease. As I said, I did discover CBS through googling, but you have enlightened me on its history with your always excellent research and writing. Than you, Linda.