A Cataract is basically an opacity on the lens in your eye. The lens is located inside the eye, behind the coloured portion (the iris) with a black hole in the centre (the pupil). This lens is transparent in a normal eye. It allows light rays to be concentrated on the back of the eye (the retina), which sends signals that allow us to see the brain. When cataracts form, the lens becomes cloudy and prevents the passage of light rays.
Do I have cataracts?
Normally, cataracts grow very slowly. It can be difficult to note the improvements they make to your sight at first, but as they get worse, you may start noticing them.