cataract onset/diagnosis measurement age of onset/diagnosis of cataract 2013-06-06T16:17:29Z A measurement of the chronological age, that is, the length of time since birth, of the individual when the symptoms of cataract first appeared, or when an official diagnosis of cataract was first determined. A cataract is an opacity of the crystalline lens of the eye or its capsule. CMO:0001584 JSmith clinical_measurement_ontology