<prompt> Chalky white optic disc on fundus examination is seen in all except-SyphilisLebers hereditary optic neuropathyPost papilledema optic neuritisTraumatic injury to the optic nerve  <response>: Chalky white disc is seen in primary optic atrophy. Trauma to optic nerve, Tabes dorsalis syphilis, and Lebers hereditary neuritis can cause primary optic atrophy.In post papilledematous Secondary optic atrophy the disc is pale or dirty grey disc. 