This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optic Nerve, Subject name: Ophthalmology
Anterior ischaemic optic neuropathy is characterized by: 
Select and explain. 
A. Centrocaecal scotoma, B. Altitudinal hemianopia, C. Ring scotoma, D. Increased blood supply
B: Altitudinal hemianopia
Answer: B: Altitudinal hemianopia 
Explanation: (Altitudinal hemianopia) (335-Parson 20th)Anterior ischaemic optic neuropathy (AION) - refers to the segmental or generalized infarction of anterior part of the optic nerve.Clinical features -* Visual loss is usually marked and sudden* Pale or hyperaemic disc, with splinter haemorrhage* Visual field shows typical altitudinal hemianopia.* Confirmation of the diagnosis - Temporal artery biopsy* Annular or ring shaped scotoma are seen in Retinitis pigmentosa.