It isn't always easy to tell the difference between cheap and real sunglasses. Many of these differences include the weight, durability, and the price.Sunglasses are designed for one purpose and that is to protect your eyes from the harmful ultra-violet rays from the sun. Some people consider only the designer brands to be 'real' while the cheap sunglasses are fake. Some of the fake sunglasses are similar to the real ones and they are difficult to tell.