He'd feel fucked and hallucinate in the mind I guess. Maybe he'd hear strange noises You could blindfold yourself and find out.
Blindness doesn't quite work like that. It's hard to imagine, but they can't even see black, like when you shut your eyes.
The vast majority of registered blind people do have some form of limited vision. Very few are totally blind. Also, they will have a concept of shapes etc and so can make their own kind of 'sight', more like a 3D map I guess. What would happen on acid I don't know.
ive often wondered what it would be like to dream etc. if the person had been completely blind all their lives and didnt know what anything looked like. i would love to find out