<prompt> Which type of visual defects are caused by a tumour of the pituitary gland pressing upon the optic chiasma?Homonymous hemianopiaHeteronymous hemianopiaBitemporal hemianopiaBinasal hemianopia  <response>: Damage to Central pa of optic chiasma as may occur from pituitary tumours interrupt the crossing fibres from nasal half of two retinae and results in bitemporal hemianopiasite and lesions are:Optic nerve- total blindnessOptic tract- homonymous hemianopiaVisual coex- macular sparingUpper tip of calcarine sulcus- contralateral Inferior quadrantanopiaLower lip of calcarine sulcus- CL Superior quadrantanopiaRef: Vishram Singh textbook of clinical neuroanatomy second edition pg 216 