Leber hereditary optic neuropathy, autosomal recessive (MONDO_0030309, a Monarch Disease Ontology id) can be described as follows. A form of mitochondrial disease that is caused by biallelic (autosomal recessive) mutations in nuclear‑encoded genes normally associated with mitochondrial Complex I subunits or assembly factors. It is characterized by sudden, painless central vision loss, optic nerve microangiopathy, and eventual atrophy in the absence of mtDNA mutations. Also known as: LHONAR.