it is safe to say this is highly theoretical and it will be years before we may see any central nervous system applications. i imagine you could safely insert a tiny fiber optic cable into one's brain and shine a light on a very small area of the brain, and who knows, leave it in place like with a DBS and shine the light continuously then remove it later on. so maybe i'm wrong!

the removal of protein deposits using vaccines has been successful in animal models, phase1 trials with alzheimers had side affects and little benefit, i think there is a phase1 trial in process or seeking approval in pd. have to double check this info.

there seems to be some controversy whether lewy bodies cause pd or are an artifact. autopsies of people receiving fetal cell transplants back in the 1980's/1990's that benefitted from the procedure showed lewy bodies in the new cells so no simple cure.