SIUav8er said:
polarized lenses are bad or flying since they "absorb" glare. this makes it harder to see traffic.
Gosh... guess I'm flying badly with my polarized lenses...
There's actually two schools of thought on that SIU... 1st is just what you stated "glare" helps you see other aircraft... the 2nd is "contrast" helps you see other aircraft. I am in the second school of thought for several reasons:
1. Glare is annoying and gives me headaches. You not only see glare from passing planes, but also glare off the dash, wipers, pitot, nose, captain's watch, instruments, lakes, ocean, etc... Glare is not fun. That same glare that helps you see something also closes your pupils and causes them to adjust more often. If you've ever spent a sunny day on the lake or ocean, kayaking or fishing... and you didn't have polarized lenses you'd understand what I'm talking about.
2. Contrast makes more sense. Is the sun always shining in your world?

Just jabbin' ya. But seriously, contrast helps you not only see aircraft, but also cloud layers, and even runway environment shooting to mins. I have a freind who is truly color blind. When he goes hunting in the woods, he see's the animals further away and way before anyone else... why? Contrast.
3. I "squint" less with polarized. My eyes are more relaxed in a pair of polarized lenses. Polarization doesn't just absorb the glare... it also allows you to see through the glare. Here's a nice trick... Drive east down a congested interstate at rush hour (around 5 pm), with the sun banging off of the road and every rear window in front of you. Have a pair of regular sunglass lenses and a pair of polarized lenses. Switch between the two. You'll notice the difference right away. With the polarized lens you'll see through the cars windows and actually see the drivers and the cars in front of them. With a standard lens, you get nothing but glare from everywhere which causes you to squint and look away more. If I'm not squinting all the time then my eyes are more relaxed and I am more likely to see things more clearly around me.
There ya go... I originally heard the "polarized...bad" remark from one of my first instructors... but after researching it on my own, (and after selling sunglasses myself), I came to a different conclusion. The benefits far outweigh the annoyances for me (tilting head to see an LCD screen go blank, etc...)
My recommendation for flying... high contrast brown or rose tint, polarized, lenses. If not polarized, then at least the high contrast like serengeti's. I have the rose tint for my flight bag, and the grey lens for everyday driving, water sports, etc...
Bob