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A cataract is a clouding of the eye's natural lens. The eye's natural lens is located behind the iris, it has the size of a lentil and it is normally clear.
It cannot be prevented, nor can it be treated with medication.
It is a very common condition and usually occurs with age.
Sometimes can be caused by trauma, certain diseases (eg diabetes, inflammation of the eye etc.) or drugs such as the chronic use of cortisone.
In a few cases, a child can be born with cataract (congenital cataract).