https://astralcodexten.substack.com/p/blindness-schizophrenia-and-autism

Some weird psychiatric trivia: no congenitally blind person ever gets schizophrenia (journal article, popular article). "Trivia" is exactly the right word for this fact; it's undeniably interesting, but what do you do with it? So far nobody has done anything, other than remark "hmm, that's funny".

I was thinking about this recently in the context of the diametrical model of autism vs. schizophrenia. This is itself pretty close to psychiatric trivia - a lot of features of schizophrenia and autism seem to be opposites of each other. As I put it here:

Many of the genes that increase risk of autism decrease risk of schizophrenia, and vice versa. Autists have a smaller-than-normal corpus callosum; schizophrenics have a larger-than-normal one. Schizophrenics smoke so often that some researchers believe they have some kind of nicotine deficiency; autists have unusually low smoking rates. Schizophrenics are more susceptible to the rubber hand illusion and have weaker self-other boundaries in general; autists seem less susceptible and have stronger self-other boundaries. Autists can be pathologically rational but tend to be uncreative; schizophrenics can be pathologically creative but tend to be irrational. The list goes on.