A cataract is a clouding of the eye's natural lens, which lies behind the iris and the pupil. The lens is mostly made of water and protein. As we age, some of the protein may clump together and start to cloud a small area of the lens. This is a cataract, and over time, it may grow larger and cloud more of the lens, making it harder to see. Cataract is of three types: 1) Nuclear cataract is most commonly seen, in the center of the lens, and is due to natural aging changes. 2) Cortical cataract forms in the lens cortex, gradually extends from the outside of the lens to the center, seen in Diabetics. 3) Sub capsular cataract begins at the back of the lens. Other types of cataract: A) Cataracts can form after surgery for other eye problems, such as glaucoma. B). Cataracts can develop after an eye injury, sometimes years later. C) Some babies are born with cataracts or develop them in childhood, D) Radiation cataract. At the start it will affect some vision, Glaring light or Bright sunlight may be uncomfortable, your vision is blurred a little, like looking through a cloudy piece of glass. Colors may not appear as bright as they once did. Measures of treatment would include Cataract surgery which is a simple, relatively painless procedure to regain vision. During surgery, the surgeon will remove your clouded lens and in most cases replace it with a clear, plastic intraocular lens (IOL). New IOLs are being developed all the time to make the surgery less complicated for surgeons and the lenses more helpful to patients.