disease has location disease or disorder optic nerve disease A non-neoplastic or neoplastic disorder affecting the optic nerve (second cranial nerve). COHD:374360 DOID:1891 ICD9:377.49 ICD9:377.9 MESH:D009901 MONDO:0002135 NCIT:C79698 SCTID:77157004 UMLS:C0029132 cranial nerve II disease cranial nerve II disease or disorder disease of cranial nerve II disease or disorder of cranial nerve II disorder of cranial nerve II disorder of the second nerve optic nerve disorder optic neuropathy second cranial nerve disorder central nervous system disease cranial nerve neuropathy disease of visual system cranial nerve II