Cataracts Cataract is the clouding of the lens within the eye. Cataract usually develops slowly over time and gradually causes poorer vision. Very small print becomes more and more difficult to see and difficulty with glare increases. Eventually it is necessary to remove the cataract. This is a very common and safe surgical procedure The cloudy lens is removed from the eye and is replaced it with a plastic implant lens, the implant lasts for the rest of life.