Optic Atrophy 9, also known as opa9, is related to infantile cerebellar-retinal degeneration and autosomal recessive isolated optic atrophy. An important gene associated with Optic Atrophy 9 is ACO2 (Aconitase 2), and among its related pathways/superpathways is Mitochondrial calcium ion transport. Affiliated tissues include retina and eye, and related phenotypes are visual impairment and optic atrophy