At 11:02 13 June 2013, Doug Mueller wrote:
DO NOT FLY WITH NON POLORIZED LENS!
by doing so you trick your eye into opening wider because of the
shade. Remember polorization is used to protect from UV light.
If
you open your eye wider by non polarized glass you expose your
eye to that UV light. You will damage your eye much quicker. It
is
not a function of can you see your instruments or not. Do not be
mislead into this kind of thinking......
Most glider canopies are not made with polorized protection.


That's ridiculous. That advice is valid only for the sort of cheap
children's or other useless coloured lenses that have little or no
UV filtering. All aviation, and other general and sporting use,
non-polarised lenses from reputable manufacturers have a high
level of UV filtering.