thin retina outer nuclear layer decreased retina ONL thickness decreased retina outer nuclear layer thickness reduced retinal outer nuclear layer thickness MPheno.ontology reduced retinal ONL thickness reduced retina ONL thickness reduced retina outer nuclear layer thickness MP:0008515 decreased retinal outer nuclear layer thickness decreased retinal ONL thickness thin retinal outer nuclear layer reduced thickness of the retinal layer that contains the nuclei and cell bodies of rods and cones abnormal retina outer nuclear layer thickness decreased thickness of the outer nuclear layer of retina