In the previous article, we discussed “What are the best online stores to order sunglasses in the USA?”. In this article, let’s talk about “Why should pilots not wear polarized sunglasses?”.
Why do pilots wear sunglasses？
Sunglasses are a standard object of the work of pilots because pilots need to be in strong light, even in backlight conditions. It is very difficult to use eyes to identify the flight conditions, the ground airport, etc. On the one hand, the plane must have a wide runway to help it take off. When the plane takes off in the daytime, especially in the hot summer, the light is very sufficient, so the runway will reflect a lot of sunlight, which will cause some damage to the pilot's eyes. On the other hand, when the plane enters the clouds, the clouds will refract the sun's rays, and the refracted sun's rays will hit the pilot's eyes, too, so it is necessary to wear sunglasses at this time.
Consideration of Security
Polarized sunglasses are not recommended for use in aviation environments. Because polarized lenses block the reflected light from horizon water or snow, and they can obscure some of the gauges covered with anti-glare filters. Polarized lenses can interfere with the ability to see through a windshield, obscuring flashes of light, such as the wings of another plane or the windshield, thereby shortening the pilot's 'seeing-avoid' response time. Coronal glass and single plastic (CR-39) are recommended for pilot sunglasses in a neutral gray color. Polarized sunglasses are not recommended because they can affect the viewing of cabin instruments. Colored sunglasses are not suitable for SAR recognition because they cause color confusion and can change depending on the target background color combination.
There are some guidelines about it.
The UK's Civil Aviation Authority (CAAUK) has given pilots the following official guidance on their choice of sunglasses. Polarized lenses are used to selectively filter out certain planes of the electromagnetic spectrum to reduce the amount of light passing through the lens. These lenses distort the view through the cockpit windshield. They can change the appearance of the cloud, reducing the ground reflection necessary for VFR flight. Therefore, the use of polarized sunglasses is not encouraged.
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