Have you noticed, aviator sunglasses mostly have green lenses? It has something to do with their origin. First, they showed up in the 1930s. Before that, pilots had goggles to protect their eyes while they were in the air. High altitudes with glaring sun and sub-zero temperatures were a real test for their eyes. The goggles helped them with those issues, but there was another one. Since the temperature differences between the air outside and within the goggles were big, the lenses would fog up and obscure the pilot's view. So, the company Bausch & Loem came up with teardrop lenses surrounded by a light metal frame. These lenses were dark green because this tint cuts out blue light, which is also a problem for pilots when they're flying above the cloud line.

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