A cataract happens when the lens within your eye becomes cloudy. It can happen to all of the lens or just part of it. There are different types of cataract, but the most common is age-related cataract, which is more common in older people. It is likely to be found to some degree in almost all people over 65. Usually, the treatment is surgery, but eye specialists do say eye drops can help relieve some of the symptoms of the condition.