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In page Optic neuritis:
"A trained healthcare provider may evaluate a patient for optic neuritis by identifying the presence and degree of visual acuity loss, visual field loss, color vision deficits, and an afferent pupillary defect in the affected eye.[1] The presence, absence, or degree of these manifestations may have associations with specific underlying etiologies of optic neuritis, but are often insufficient to definitively establish a diagnosis of optic neuritis and its associated cause.[citation needed]
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