In the search for more objective, physiological signs of schizophrenia, other aspects of the eyes have also been studied, with mixed results. At least one study purported to find particular groups of facial features, including small eyes and narrow openings between the eyelids, in two subgroups of schizophrenics, but most psychiatrists don't think such findings are useful. Researchers in the United Kingdom recently developed a computer model that could separate out a group of schizophrenics by tracking abnormalities in the movement of their eyes. However, so far the test isn't accurate enough to be used for diagnosis.
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Explainer thanks Philip Seeman of the University of Toronto and Ole Thienhaus of the University of Arizona.