Can I buy cheap sunglasses?

Thank you. "Cheap" and "expensive" means that my understanding is that the price is high or low, regardless of the absolute value of the price, but it can easily be confused. In fact, this has been used by many businesses. The main problem with unqualified sunglasses is: 1, do not block UV: This is a very steep problem, because it really does not need to increase the cost. But the harm is great, because when the light is dim, the pupil of the person will naturally grow up, through the pupil into the eye of ultraviolet light, but more. UV damage to the eye can be accumulated and irreversible. 2, optical indicators failed: including sphericity, prism and so on, easy to see things deformation, if driving, there may be traffic hazards. Eyes are also very tired. Long term wear, great harm to the eye. There are two reasons for the cheap: 1, good quality unsalable inventory products: glasses, after all, are highly decorative products, most of the reasons can not sell, or style problems. The quality of this kind of product is no different from that of the best seller. If the decoration is not high, it is recommended to buy such products. 2, inferior materials and processes made of low-priced products: such products know how to cut corners where the naked eye can not judge. This kind of product is purely garbage!!! How does a layman judge the quality? 1, choose reliable brand: mature and stable brand a lot, has always been good reputation. But be careful not to choose advertising flooding, because every penny of advertising will be borne by the customer. 2, choose reliable factories: factories are like wine, not long accumulation, it is impossible to make products of excellent quality. In those days, values were also easy to judge factory tonality. 3, choose the reliable store: you can choose from the reputation of the masses.

Thank you. "Cheap" and "expensive" means that my understanding is that the price is high or low, regardless of the absolute value of the price, but it can easily be confused. In fact, this has been used by many businesses. The main problem with unqualified sunglasses is: 1 do not block UV:, This is a very steep problem, because it really does not need to increase the cost. But the harm is great, because when the light is dim, the pupil of the person will naturally grow up, through the pupil into the eye of ultraviolet light, but more. UV damage to the eye can be accumulated and irreversible. optical indicators failed: including 2. Sphericity prism, and so on, easy to see things deformation, if driving, there may be traffic hazards. Eyes ar E also very tired. Long term wear, great harm to the eye. There are two reasons for the cheap: 1 good quality unsalable inventory, products: glasses, after all, are highly, decorative products, most of the reasons can not sell, or style problems. The quality of this kind of product is no different from that of the best seller. If the decoration is not high, it is recommended to buy such products. 2 inferior materials and processes, made of low-priced products: such products know how to cut corners where the naked eye can not judge. This kind of product is purely garbage!!! How does a layman judge the quality choose reliable brand: mature? 1, and stable brand a lot, has always been good reputation. But be careful not to choose advertising FL Ooding, because every penny of advertising will be borne by the customer. 2 choose reliable factories: factories are, like wine, not long accumulation, it is impossible to make products of excellent quality. In those days, values were also easy to judge factory tonality. 3 choose the reliable store:, you can choose from the reputation of the masses.