Ocular abnormalities.  Ocular abnormalities. (A) Anterior ischaemic optic neuropathy—note swelling of the optic disc. (B) Acute central retinal artery.

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 Ocular abnormalities.  Ocular abnormalities. (A) Anterior ischaemic optic neuropathy—note swelling of the optic disc. (B) Acute central retinal artery occlusion with sparing of cilio-retinal artery—note oedematous (white) retina with cherry red spot at macula. (C) Central retinal vein occlusion. (D) Retinitis pigmentosa—note “bone spicule” pigmentary changes. (E) Optic atrophy of temporal disc—note how pale the disc is in true optic atrophy. (F) Optic nerve head drusen—note yellow refractile bodies within discs with associated lack of optic cups. C J Lueck et al. J Neurol Neurosurg Psychiatry 2004;75:iv2-iv11 ©2004 by BMJ Publishing Group Ltd