A cataract is a condition in which the clear lens of the eyes becomes cloudy, preventing sufficient light rays from entering the eyes and impairing vision. Age is the most common reason for developing cataracts. The development of cataract is also associated with a positive family history (if a family or relative has cataract before), an unhealthy lifestyle (such as smoking and heavy alcohol intake) and prolonged exposure to sunlight or radiation. Cataracts can cause eyes to be easily irritated, and can lead to decrease in visual acuity, with blurry and double vision.