Cranial Nerve Diseases [Disease/Finding] Eye Diseases [Disease/Finding] Optic Nerve Diseases [Disease/Finding] C4632 C0029132 Optic Nerve Diseases Conditions which produce injury or dysfunction of the second cranial or optic nerve, which is generally considered a component of the central nervous system. Damage to optic nerve fibers may occur at or near their origin in the retina, at the optic disk, or in the nerve, optic chiasm, optic tract, or lateral geniculate nuclei. Clinical manifestations may include decreased visual acuity and contrast sensitivity, impaired color vision, and an afferent pupillary defect. Second Cranial Nerve Diseases 985060 Cranial Nerve II Diseases Neural-Optical Lesion M0015358 N0000002227 77157004 Cranial Nerve II Disorder Optic Nerve Diseases D009901 Optic Neuropathy