Congenital blindness reveals surprising clues about schizophrenia
Across seven decades of observations and a major 2018 study, scientists have repeatedly found that people born blind due to cortical (brain) damage do not develop schizophrenia, unlike those who become blind later or whose blindness comes from eye disease. The protection seems tied to how the visual cortex is repurposed early in life, potentially stabilizing the brain’s predictive processing and reducing misfired predictions that underlie psychosis. Timing matters: loss of vision later in life doesn’t confer the same protection. These findings point to new directions for treatment that could target perception, learning, and brain circuits (including glutamate systems in the visual cortex) alongside traditional dopamine-focused approaches, though blindness is not a practical safeguard. This line of research deepens our understanding of brain development and the origins of schizophrenia.”
