Enclosed Cockpit

Pilots need eye protection from sunlight damage as they are exposed to higher levels of radiation, in the form of Ultraviolet (UV) and High Energy Visible (HEV).  Colour recognition of the instrumentation, and also glare reduction in the cockpit are also important factors when selecting sunglasses.  

The US FAA states that pilot sunglasses should include lenses that are free from distortions and imperfections and that have adequate transmissivity (approx. 15% transmission).