<prompt> In Optic neuritis in children, all symptoms are present EXCEPT -Afferent pupillary defectHeadache and vomitingPain on movements of eye ballSudden vision loss  <response>: Optic neuritis cause sudden loss of vision with pain on ocular movement. There is afferent pupillary defect RAPD.Headache and vomiting are symptoms of increased ICT, which occur in papilloedema not in papillitis optic neuritis. 