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. 2015 Apr 2;5(4):e007766. doi: 10.1136/bmjopen-2015-007766

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Patient enrolment flow chart. Ophthalmologists diagnosed ON with the disturbance of optic acuity, visual field, critical flicker frequency (CFF), brain MRI, optical coherence tomography (OCT) and fluorescein fundus angiography. ION, ischaemic optic neuropathy; LHON, Leber's hereditary optic neuropathy; MS, multiple sclerosis; NMO, neuromyelitis optica; NMOSD, neuromyelitis optica spectrum disorders; OAS, orbital apex syndrome; ON, optic neuritis; TAO, thyroid-associated ophthalmopathy; THS, Tolosa-Hunt syndrome; MOG, myelin oligodendrocyte glycoprotein.