Altitudinal visual field defect is seen in -

Ans. is 'c' i.e., Anterior ischemic neuropathyAnterior ischemic optic neuropathy (AION)o It is a condition of local anoxia of the anterior region of the optic nerve.o It is due to the involvement of posterior ciliary artery and may be central retinal artery causing infarct of the anterior part of the optic nerve and retina.o It occurs commonly in neglected acute attack of closed angle glaucoma, severe anemia, after a massive haemorrhage, and temporal arteritis.o There is sudden loss of vision.o On examination there is swelling of the disc resulting in optic atrophy,o Permanent altitudinal visual field defects are present.o These involve two quadrants of either the superior or inferior visual field.