early-onset progressive neurodegeneration-blindness-ataxia-spasticity syndrome (Monarch Disease Ontology entry MONDO_0014209) is a genetic neurodegenerative disease characterized by normal early development followed by childhood onset optic atrophy with progressive vision loss and eventually blindness, followed by progressive neurological decline that typically includes cerebellar ataxia, nystagmus, dorsal column dysfunction (decreased vibration and position sense), spastic paraplegia and finally tetraparesis.