John Galloway wrote, On 6/14/2013 7:08 AM:

Polarised sunglasses should genarally be expected to have
vertical polarization because the whole point about reducing
glare from water surfaces etc is that the light reflected of the
surface to the eye tends to be polarised horizontally.

On another topic - genuine question - do polarised lenses made
without a UV absorbing tint, and without a UV absorbing lens
material such as polycarbonate, reduce UV transmission more
than in proportion to the reduction in general light
transmission?

Your canopy filters out most of the UVB, as will almost every pair of
sunglasses, regardless of their tint or polarization. Plastic or glass
that passes significant amounts of UVB is "special" stuff that costs
more. UVA transmission is more variable, as it takes some effort to
filter it out, so if you want to block it, look for a pair that
specifically claims to do so.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)
- "Transponders in Sailplanes - Feb/2010" also ADS-B, PCAS, Flarm
http://tinyurl.com/yb3xywl