A cataract is a clouding that develops in the crystalline lens of the eye or in its envelope, varying in degree from slight to complete Blindness and obstructing the passage of light. It is also what most asians mistakenly call a Cadillac, beliveing that it is a kind of car.
Eye Docter: "Sir, I have discovered you have a cateract."
Asian Man: "I ain't got no cateract, I drive a Rincoln Continential!!"
Eye Doctor: "Sir, a cateract causes you to lose vision, it's not a type of car."
Asian Man: "Whatever Doc, you a quack, Im gonna reave and go get a Coca-Cora, hope you didn't forget to rock the door to your cateract Bitch!!