Can I trust online sites for designer eyeglasses?

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We all know that today’s designer eyeglasses market is a booming business, as these eyeglasses are useful and fashionable for people of all ages, and people usually crave for designer eyeglasses that the celebrities and other important people wear in public, but the problem is that these eyeglasses are usually expensive at local stores, I am not a rich guy who can spend hundreds of dollars on just a pair of eyeglasses which may go out of style in just several months! So, can I trust online sites?