I work with a deaf schizophrenic person and they talk (write, sign) about their "mind being quiet" or being "way out of my mind". When clearly experiencing symptoms they'll often look, sign, yell or kick at a specific area but can't really detail what exactly's happening in those moments.

In my experience the behavioural elements of schizophrenia would be hard to miss, i doubt visual vs non-visual hallucinations would change that.

My understanding is it can be hard to narrow down schizophrenia vs other diagnoses, but it's usually obvious that something is going on. I'd think if people were looking for blind schizophrenia cases they'd at least have a pool of likely candidates to look into.

I'm instantly skeptical of "no blind schizophrenics" but it's just gut. I can't think of any explanation.