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Flying

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Sports sunglasses and prescription sports sunglasses in the shape of narrow frames that carry large lenses are the most desirable from a field of view standpoint. The most critical problem with frames arises from the presence of wide sidearms which can significantly impair the peripheral visual field.

Lenses should not be too dark, and should transmit at least 15% of incident light. The tint used should be "neutral density"
(N.D.), that is, a greyish tint that does not distort colour perception. Much has been written about the perceived benefits of various coloured lenses, especially in regard to contrast and perceived brightness. Coloured lenses have been shown to reduce the colour information received, and to have a detrimental effect on both perception and reaction time. 

Lenses of polycarbonate material are preferred because of their impact-resistance and ability to absorb ultra-violet and infra-red rays. However, these lenses can scratch easily. Harder materials may be suitable, however these may be more prone to shattering in an impact.


Polarising sunglasses should not be used when flying. The polarising filter interacts with the cockpit transparency to produce a distorted and degraded visual image. This effect can also be seen with laminated car windscreens. Better keep the polarised lenses for fishing.

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