3-Methylglutaconic Aciduria, Type Iii, also known as optic atrophy, is related to leber hereditary optic neuropathy, modifier of and optic atrophy 7 with or without auditory neuropathy, and has symptoms including ataxia, muscle spasticity and abnormality of extrapyramidal motor function. An important gene associated with 3-Methylglutaconic Aciduria, Type Iii is OPA3 (Outer Mitochondrial Membrane Lipid Metabolism Regulator OPA3), and among its related pathways/superpathways is Mitochondrial calcium ion transport. The drugs Idebenone and Protective Agents have been mentioned in the context of this disorder. Affiliated tissues include eye and retina, and related phenotypes are visual impairment and choreoathetosis