Visual evoked potentials and postmortem findings in a case of cortical blindness

Area of Science:

• Neuroscience
• Ophthalmology
• Neurology

Background:

• Cortical blindness typically results from damage to the primary visual cortex.
• Posterior cerebral artery infarcts can cause extensive bilateral damage to visual processing areas.

Observation:

• A patient with diagnosed cortical blindness following bilateral posterior cerebral infarcts was studied.
• Visual evoked potentials (VEPs) were repeatedly assessed using flash stimulation.

Findings:

• Occipital VEPs were consistently detected in the patient despite severe visual impairment.
• These findings suggest the presence of functional visual pathways bypassing the primary visual cortex.

Implications:

• The results indicate that extrageniculocalcarine pathways may mediate visual processing in cases of cortical blindness.
• This highlights the brain's plasticity and potential for alternative visual system compensation.
• Further research into these alternative pathways could inform therapeutic strategies for visual recovery.