A cataract is a cloudy area in the normally clear lens of the eye. Depending upon its size and location, it can interfere with normal vision. Most normal cataracts develop in people over age 55. Some of the most frequent symptoms of an early cataract may be increased glare with night driving and increased sensitivity to bright lights during the daytime. Usually cataracts develop in both eyes, but one may be worse than the other. Reasearchers have linked eye-friendly nutrients such a lutein, vitamin C, vitamin E, and zinc to reducing the risk of certain eye diseases, including cataracts.