Aviator glasses come into our sight because of Douglas McArthur who was photographed in Aviators in WWII. And now, most of eyeglasses of Ray Ban are made in aviator glasses. Compared with common glasses, aviator glasses have two bars on the nose bridges. If you want to look what aviator glasses look like, just search in it Google images. Here you can see: https://www.google.com/search?num=10&hl=en&safe=strict&site=imghp&tbm=isch&source=hp&oq=+aviator+glasses&gs_l=img.12..0l5j0i5l5.11752.11752.0.12621.1.1.0.0.0.0.126.126.0j1.1.0...0.0.zbbyWfK5vEk&q=aviator%20glasses&orq=+aviator+glasses&biw=1366&bih=606&sei=8nv2T7e2OY6RigfDh9npBg