How can I identify real designer eyeglasses frames?

[rimless glasses frames]

Do you love to wear designer eyeglasses frames? Today, such eye wears are especially popular today, as glasses nowadays are not as expensive as dozens of years ago, you can even keep several pairs in your drawer, and for another important reason, designer eyeglasses can give you a more impressive appearance, making you looked lovely, mature or ***y as your wish! However, there are also many criminals trying to sell fake brands glasses for an illegal profit, so, do you know how can I identify them?