Cataracts, a common vision problem, cause the lens of the eye to become cloudy. Age-related cataracts are the most common form of the condition, but there are several different types. Symptoms of a cataract may include blurry vision, double vision, and frequent prescription changes for eyeglasses or contact lenses. Cataracts are typically removed with surgery. In fact, over 1 million such surgeries are performed each year in the United States, with generally favorable results.