Age-related cataract Age-related cortical cataract 2011-06-27T09:50:54Z UMLS:C2880562 The cortex of the lens is made of the newest lens fibers. With aging, discrete opacities can develop within the cortex of the lens that typically cause no visual symptoms unless they involve the visual axis or the entire cortex, in which case the lens becomes white and is said to be mature. HP:0011143 A type of age-related cataract that primarily affects the cortex of the lens.