No, they are not the same thing. Firstly, uv400 is already the highest protection for a pair of sunglasses. It can totally block the uv rays that attack you. You can rest assured to wear them and you don' t need to worry if they will hurt your eyes. Eyes are really very important for us, we need to try our best to take good care of them. Now let' s talk about polarized sunglasses. Polarized sunglasses are designed for sensitive eyes. They are not the same. In most cases, if your sunglasses are not with uv400, then they must be polarized sunglasses, lol.