Summer, go out to wear sunglasses

Yesterday, when it's hot to see an old lady in the street, wrinkled face, wearing a white box type pilot sunglasses, very fashionable. At first, I thought she only about 60 years old, she took off the glasses after I saw deep-set eyes and gullies of crow's feet, she seems to have been 80 years old.
know why stars go out wearing sunglasses, half of her face covered up, and a good disguise the age and tired. This time summer, sunglasses become necessities, men, women and children on the street all covered his eyes with it. Also seen several particularly funny, sunglasses to wear low, above the eyebrows, to see the road is hard to eyelid to lift, how see how did like the blind.
sunglasses from the night market, a lot of people around the dozens of yuan to buy one, get one free product, in fact, sunglasses and myopia is as important as the mirror, I heard that cheap sunglasses may let the human eye is acerbity vertigo, to put it bluntly, it's material is the two plastic ( 10795175. 00, 1. 65%) Slice, couldn't keep out the UVA and UVB rays. You say wearing two plastic see not clear thing, eyes has been working hard, can not dizzy?
sunglasses or want to normal optical shop to buy, the clerk can according to your vision do detailed test and recommendation, if you want to buy in stalls, glasses at least also want to have a QS logo and the production license of anything.