title: Dating the onset of cataract.
mesh_terms: D000328:Adult; D000368:Aged; D002386:Cataract / Q000175:diagnosis / Q000503:physiopathology; D002675:Child, Preschool; D006801:Humans; D007908:Lens, Crystalline / Q000254:growth & development*; D008875:Middle Aged; D013997:Time Factors