the breakdown and loss of cells in the retina. Resulting in difficulty seeing at night and the loss of side vision. Synonyms: RPRelated Articles: Co-Enzyme Q10 DeficiencyMitochondrial MyopathyGene Therapy Trial for Mitochondrial Disease of Retina Found Safe, Can ContinueMitochondrial Disease TermsGene Therapy Trial for Mitochondrial Disease of Retina Found Safe, Can Continue