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MBBS QUESTION #10281
Question 1
A lesion of the optic chiasm classically causes bitemporal hemianopia, whereas a lesion of one optic tract (posterior to the chiasm) instead produces:
  • Complete bilateral blindness
  • A homonymous hemianopia — loss of the same (matching) visual field in both eyes, contralateral to the side of the lesion✔️
  • Monocular blindness confined to the ipsilateral eye only
  • Bitemporal hemianopia, identical to a chiasmal lesion
Correct Answer Explanation
Beyond the chiasm, each optic tract carries fibers from the temporal retina of the ipsilateral eye and the nasal retina of the contralateral eye (both representing the same, contralateral, visual field); a lesion here produces a homonymous hemianopia affecting the opposite visual field in both eyes, distinguishing it from a chiasmal (bitemporal) lesion.