One result of the natural aging process is cataracts. By age 65, nearly everyone has the problem to some degree.
Cataracts are painless, progress very slowly, and are visible only after they become advanced.
They are clouding of the lens of the eye caused by changes within the eye. They are not a film over the eye. With age, the lens becomes dense and firm. The proteins in the lens change, causing the white appearance that is noticeable when cataracts have progressed for some time. Cataracts may be on the edges of the lens for years without causing problems, but when they occur on or progress to the front of the lens, in line with your pupil, they cause the vision problems they are known for.