When a cloudy area develops within the normally clear lens of your eye, it is called a cataract. Cataracts may develop quickly, but usually form gradually over a period of several months or years. They can often develop more rapidly in one eye than the other. Indications that a cataract may be forming include haziness and blurred, distorted or even double vision; an increasing need for more light; and sensitivity to bright light, especially at night. During your eye examination, your optometrist will analyze for any opacity in the lens of your eye, to determine if you have a cataract.