A 52-year-old man with hypertension presents with sudden-onset visual field loss. Perimetry shows a homonymous hemianopia with preserved pupillary light reflex and no afferent pupillary defect. Which feature best distinguishes a post-geniculate (optic tract/radiations/cortex) lesion from a pre-geniculate (retina/optic nerve/chiasm) lesion?

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