There is a long history of research on impaired eye movements associated with schizophrenia. Using a series of simple viewing tests, researchers explored the ability of these eye movement tests to distinguish people with and without the diagnosis of schizophrenia. Using their complete dataset, they were able to develop a model that could discriminate all schizophrenia cases from healthy control subjects with an impressive 98.3% accuracy.

Source: Eye movements and the search for biomarkers for schizophrenia