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Download scientific diagram | Example of borderline small optic disc wherein the ratio of disc diameter (DD) to disc-macula (DM) distance equals 0.36. Thus far, all patients with a DD/DM ratio greater than 0.35 have had normal vision and no other manifestations of the syndrome of optic nerve hypoplasia. Note that the DD is approximately 2.5 times larger than the width of the central retinal vessels (bracket). from publication: The syndrome of optic nerve hypoplasia | The congenital malformation known as optic nerve hypoplasia (ONH) has been recognized in the past 30 years as an epidemic cause of congenital blindness. It was believed to occur either as an isolated anomaly or as a component of the syndrome of septo-optic dysplasia, which | Optic Nerve, Septo-Optic Dysplasia and Syndrome | ResearchGate, the professional network for scientists.
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