Lesion in the optic chiasma causes -a) Bitemporal hemianopiab) Upper nasalc) Lower nasald) Upper temporale) Lower temporal
Central lesions of optic chiasma


Characteristic visual field defect → Bitemporal hemianopia


Initially temporal quadrantanopia may occur :-


Lesion compressing from below → upper temporal
Lesion compressing from above → lower temporal

Lateral lesions of optic chiasma → Binasal hemianopia
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