Homonymous hemianopia

left homonymous hemianopia
Lesion of the optic radiation as it approaches the occipital cortex can lead to homonymous hemianopia which is often congruous. Lesion of the occipital cortex may produce macular-sparing homonymous hemianopia this is most often seen in cerebrovascular accident involving the posterior cerebral artery

Testing for macular sparing. This is done by moving a red target form the non-seeing field into the seeing field. If the red pin is noticed before it crosses the mid-line, macular sparing is present.

How would you investigate a patient with homonymous hemianopia?

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left homonymous hemianopia with macular sparing