As the age increases and the symptoms of aging in the body start, the eyes also undergo a change and at first, the near vision decreases, which can be solved using the glasses but gradually the lens of the eye also changes due to aging and its transparency is diminished, One's eyesight is diminished.
Congenital diseases, the use of some drugs, exposure to harmful rays and some diseases (most importantly diabetes) also cause or accelerate the development of cataracts.