Cataract is a condition affecting the eye where the lens becomes cloudy, which affects vision. Symptoms of cataract include blurred vision, difficulty seeing at night, double vision, faded colors, halos around lights, and sensitivity to light. Cataracts can be caused by aging, eye injury, certain medical conditions, and prolonged exposure to ultraviolet light. Diagnosis of cataracts is done through a comprehensive eye exam, which includes an eye chart test, a slit lamp examination, and an ultrasound of the eye. Treatment for cataracts usually involves surgery to remove the clouded lens and replace it with an artificial lens. Other treatments may include vision correction with eyeglasses and anti-glare glasses.