These Khan-brand men's aviator shield sunglasses change everything that people expect when they think about aviators. Other varieties of these shades have two lenses separated with a metal bridge. When you look at these sunglasses, you will see that it's a single-piece lens. It's desirable to have shades that don't have two separate lenses. The structure of these sunglasses is done in a way that prevents excess sunlight from leaking through the sides. On the plus side, you will have the ability to let people see your eyes, which is more difficult when you wear sunglasses with a darker tint.