Sunglasses, including affordable sunglasses and design sunglasses, are now indispensable accessories in ordinary life. They do not only protect our eyes, but also make us more fashionable and beautiful. But are affordable sunglasses and de…

Lights from the sun will reflect and form the vertical and horizontal rays when encounting the smooth surfaces as lake, highway. The vertical rays are good but the horizontal rays cause the glares which are annoying and harmful to the eyes…