the sun will be greatly reduced

We often adjust the pupil size, according to the power of the light. Comparison of the students get, when strong light and weak mydriatic. However, when the light is too strong, for our students, our eyes will be hurt. Therefore, in the summer, sunglasses are deeply its fashionable appearance and shade and radiation testing function and aesthetics. Sunglasses, sun and shade during the period, from strong to harm the eyes the sun will be greatly reduced.
So popular, many cheap sunglasses, in the summer, ranging from $1 to $10, and even in some of the small shop selling sunglasses. They are fashionable and lovely appearance, however, no packaging or label, and from that, they are easily generated by the regular factory. However, although many people know that they are very poor, they will buy, simply because they are cheap! They think they perform the same high-quality sunglasses.
However, the fact is, cheap glasses, especially the poor, our eyes are not really good. Exports, the forged and fake sunglasses to protect eyes, can not, but do harm to the eyes. It is understood, contraction of the students, have the strong sunlight shining, to a certain extent this will block harmful radiation, such as ultraviolet radiation. At such a pace in the dim light, mydriasis. Therefore, radiation wearing inferior sunglasses can not block the light, which will effectively injected eyes let more ultraviolet light. We can say, this is better than not wearing any Sunglasses wearing sunglasses. If wearing the sunglasses eye too frequently, there may even be burned. If severe enough, these damaged cells in the retina was not restored.
Therefore, we should avoid seeking small gain, at great cost. In short, the eye is precious. Cheap glasses will undoubtedly save a lot of money, but for you, you know that you are a risk of harm to your eyes. If you want to find cheap, you can shop online shop, because the business practice of special, a lot of cost will be saved.