If you said optic nerve damage causes blindness which is sometimes so fast, nobody dares to disagree. My question is another direction and is about the reasons the other 11 nerves have not gotten a part of a concern for possibilities and clues. Try to find systemic researches done on this point, you will be surprised to have no more than few case reports. Optic nerve damage should alert us to a potential possibility of significant effects or malfunctions in these 11 nerves like auditory, facial, trigeminal, vagus as well as the others. If my observation proved true, I would put it as one more evidence of our gaps in understanding and evidence of misunderstanding hydrocephalus.