left homonymous hemianopia
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.
left homonymous hemianopia with macular sparing