Originally Posted by
irishpilot1990
i have not heard of the problem with polarised lenses before...can some one fill me in
Simple enough.
Polarised lenses cut down the light into your eyes by polarising it: they cut out lots of light that isn't in the right polarity.
Perspex is quite capable of doing the same sometimes.
If the polarised direction is co-incident, then the sunglasses stop nothing that the perspex didn't, so you get no benefit. If it's not, then it stops most of what the perspex didn't, and you can't see a thing. Either way, perspex + polarising sunglasses can be a bad thing!
G