Note, my sample size is far too small to draw universal conclusions about schizophrenic.
Since blind people need to rely on others a lot more than people with sight, I think it would be even harder for them to avoid medical authorities than for other schizophrenics. For what it's worth, the schizophrenics I knew personally were not averse to seeking help for their condition, but were very distressed by side effects from medication (understandably!)
There's a strong cultural component to how schizophrenia manifests. Violent, paranoid thoughts are more common in societies like the United States. The extent to which their experiences can fit into a positive cultural narrative partly dictates their quality of life. The U.S. is exceedingly hostile in that regard. You're likely better off in a society where hearing voices is considered a gift from the gods, or where perceiving odd but intriguing cause+effect relationships suggests you can sense magic.
Googling will show similar reporting in the literature over several decades. I don't think I've seen any contradictory research, though that's not surprising as this is just an interesting observation; there aren't any sophisticated, concrete explanatory models to critique--individualist vs collectivist dichotomy seems intuitive but not concrete on its own. Rather the focus seems to be on pragmatic therapy. It's noteworthy nonetheless, particularly as a reflection of American society, and of how culture informs pathology, a point usually made regarding more touchy-feely mental health issues and thus lacking punch.
It’s not like screening people for spectrum or personality disorders.