Just behind the pupil of your eye is the lens. This focuses the light entering the pupil to make a clear image in the retina. The retina changes the image into a nerve impulse so that the brain can “see” it. Usually the lens of the eye is crystal clear so that light passes through it easily. If any cloudiness develops in the lens then it starts to block the light passing through and the patient begins to get blurred vision. This clouding of the lens is called CATARACT. When the blurring gets worse it is better to have the cloudy lens removed by an operation and replaced by a clear artificial lens.