autoimmune/inflammatory optic neuropathy optic perineuritis https://www.malacards.org/card/idiopathic_optic_perineuritis OPN Orphanet:499107 SCTID:713417000 A rare ophthalmic disorder characterized by idiopathic orbital inflammation in which the specific target tissue is the optic nerve sheath. Patients typically present with ocular pain, pain on eye movement, visual symptoms with loss of vision progressing over several weeks, dyschromatopsia, and variable visual field defects. Orbital signs and symptoms may be present and include ptosis, ophthalmoplegia, and exophthalmos. Optic disk edema is observed in most cases. The condition is usually unilateral. icd11.foundation:349248275 MEDGEN:881493 MONDO:0044690 UMLS:C4076165 GARD:0022041