<prompt> Bitemporal hemianopia is seen in -Pituitary tumorPapilloedemaOptic neuritisGlaucoma  <response>: Ans. is a i.e., Pituitary tumor Ref: Khurana 4thep. 290o Characteristic visual field defect of central chiasmatic lesion is bitemporal hemianopia. Pituitary tumor causes central chiasmatic lesion.o Bitemporal hemianopia results due to central sagittal lesion of the optic chiasma, common causes of which are tumors ofthe pituitary gland most common, craniopharyngioma, suprasellar meningioma, glioma of third ventricle; chiasmal arachnoiditis, and third ventricular dilatation,Site of lesionVisual field defectOptic nerveBlindnessOptic cbiasmaBitemporal hemianopiaOptic tractIncongruent homonymous hemianopiaLateral geniculate bodyHomonymous hemianopiaOptic radiation TotalHomonymous hemianopia, sometimes with macular sparingOptic radiation lower fibres temporal lobeHomonymous upper quadrantanopiaOptic radiation upper fibres parietal lobeHomonymous lower quadrantanopiaVisual cortex anterior occipital cortexHomonymous hemianopia with macular sparingOccipital cortex tipHomonymous macular defect 