Older female holds a magnifier to a package. She is standing in front of another woman who is helping her with the magnifier.

Cortical visual impairment

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What is CVI?

CVI happens when there is neurological damage that affects the visual parts of the brain. This can be caused by a stroke, decreased blood supply, decreased oxygenation, seizure, infection, head trauma and other neurologic disorders. Sight loss from CVI may be temporary or permanent.