polarising corrective sunglasses

[toomuchradiations]

hiya!,
i understand polarising corrective lenses SHOULD NOT be used....but does this mean they are banned???
my back up spectacles are of this type and i was wondering whether it is fully legal!

thanks very much,

tmr

[welliewanger]

I don't think they're banned, but they definitely aren't recommended for flight. Many aircraft have polarised windscreens. If you add polarised sunglasses to the equation and you get very dodgy vision!