I flew with contact lenses and Serengetti sunglasses for years -- until
I could no longer read the sectional charts without some serious
squinting. Finally caved in, through away the contact lenses, and
spent a lot of money on progressive-lens sunglasses. Initially talked
to the Sun-Tiger guy and was told he would not recommend his product at
the time because of a manufacturing defect in the product he received.
He suggested "Melanin" sunglasses. Purchased these through my Eyecare
Proffessional and have driven with them a "LOT" and flown with them
about a dozen times. Just love them. Yes, they are polarized, but
have not had a problem to date (don't want to start a thread on
polarized lenses!!). Just something other that Serengetti or RayBan or
whatever to look in to.