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Optic disc morphology and NAION
  1. Jost B Jonas
  1. Department of Ophthalmology, Medical Faculty Mannheim of the Ruprecht-Karls-University of Heidelberg, Heidelberg, Germany
  1. Dr Jost B Jonas, Universitäts-Augenklinik, Theodor-Kutzer-Ufer 1–3, 68167 Mannheim, Germany; jost.jonas{at}augen.ma.uni-heidelberg.de

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Non-arteritic anterior ischaemic optic neuropathy (NAION) is a widespread visually disabling disease in the middle-aged and elderly population.1 Based on clinical observations by Hayreh, Beck, Savino and others, a low cup/disc diameter ratio and a small optic disc have been described to be structural factors associated with the disease.114 The physiological correlation between disc size and cup/disc ratios explains15 why both parameters have been connected with NAION. Hayreh and colleagues discussed that a nocturnal arterial hypotension may lead to a small circumscribed ischaemia in the optic nerve head.1 16 17 In normal-sized discs or large discs, this ischaemic event may go unnoticed and may not be associated …

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