What is Lesion in the optic chiasma causes -a) Bitemporal hemianopiab) Upper nasalc) Lower nasald) Upper temporale) Lower temporal and explain in detail?
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