Microvascular abnormality in schizophrenia as shown by retinal imaging

Area of Science:

• Neuroscience
• Ophthalmology
• Psychiatry

Background:

• Retinal and cerebral microvessels share structural and functional similarities.
• Retinal microvasculature can be assessed noninvasively using retinal imaging.
• Cerebral microvascular abnormalities are implicated in schizophrenia, but direct measurement is challenging.

Purpose of the Study:

• To test the hypothesis that schizophrenia is associated with microvascular abnormalities.
• To evaluate the utility of retinal imaging as a research tool for schizophrenia.
• To investigate the relationship between retinal microvascular caliber and psychosis symptoms.

Main Methods:

• Utilized data from the population-representative Dunedin Study cohort.
• Performed retinal imaging on study members at age 38.
• Assessed retinal arteriolar and venular caliber in all participants, including those with schizophrenia.

Main Results:

• Individuals who developed schizophrenia exhibited wider retinal venules compared to controls.
• Wider venules were observed even after controlling for confounding health conditions.
• Wider venules correlated with adult psychosis symptom dimensions and childhood psychosis symptoms.

Conclusions:

• Findings support the hypothesis of microvascular abnormalities in schizophrenia.
• Suggests shared vascular mechanisms for subthreshold and clinical psychosis, potentially starting early in life.
• Highlights the potential of retinal imaging for studying schizophrenia pathogenesis.