This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Homonymous hemianopia may be seen in lesion of all of the following, EXCEPT: 
Select and explain. 
A. Optic chiasma, B. Optic tract, C. Optic radiation, D. Occipital lobe
A: Optic chiasma
Answer: A: Optic chiasma 
Explanation: Lesion of the optic chiasma result in bitemporal hemianopia not homonymous hemianopia. Lesions of the visual pathway and corresponding field defects: Lesion of optic nerve: Ipsilateral blindness Lesion through proximal pa of optic nerve: Ipsilateral blindness with contralateral quadrantanopia. Lesion of optic tract: Homonymous hemianopia Lesion of temporal lobe: Quadrantic homonymous defect Lesion of optic radiation: Homonymous hemianopia with occasional sparing of the macula Lesion in anterior pa of occipital coex: Contralateral temporal crescentic field defect Lesion of occipital lobe: homonymous hemianopia usually sparing of the macula Ref: Textbook of Ophthalmology By H. V. Nema, page 340