A
cataract is a clouding of the
lens in the
eye leading to a
decrease in vision. It can affect one or both eyes. Often it develops slowly. Symptoms may include faded colors, blurry vision, halos around light, trouble with bright lights, and trouble seeing at night. This may result in trouble driving, reading, or recognizing faces. Poor vision may also result in an increased risk of
falling and
depression. Cataracts are the cause of half of
blindness and 33% of
visual impairment worldwide.