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In page Cerebral polyopia:

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Though there is no clear cause of cerebral polyopia, many cases show associations with occipital or temporal lobe lesions.[1] Most cases of polyopia occur when there are bilateral lesions to occipital or temporal cortex, however some cases are present with unilateral lesions.[2] Thus, polyopia can result from any kind of infarction to the occipital or temporal lobes, though the exact mechanism remains unclear. Some cases have shown that polyopia is experienced when the infarctions were seen to be at the tips and outer surfaces of the occipital lobes.[3] By contrast, some patients experience cerebral polyopia associated with headaches and migraines in the frontotemporal lobe.[citation needed]