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In page Optic neuritis:

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Fundoscopy is another modality of clinical evaluation that is performed with an ophthalmoscope. Findings that support a diagnosis of optic neuritis include optic disc edema, disc inflammation, disc hemorrhages, or ocular inflammation.[1] However, these findings are not always present in every patient, such as in patients with idiopathic optic neuritis which often have normal fundoscopic findings.[citation needed]