The aging process is most directly associated with cataracts. As the body ages, the normally transparent lens begins to harden and becomes cloudy. There is increasing evidence that lifelong exposure to UV light contributes to the formation of cataracts. Over half of all people aged 65 and older have some degree of cataract development. In addition, eye injuries, certain medications, diabetes, kidney disease, smoking and high blood pressure may contribute to the formation of cataracts.