sun glasses again...
After reading this thread and went down to my local store to look for a pair of Serengeti's (read about them on the net and about there "special" linces. I came home an hour later totally confused, because I need strenght in them and they said it could be done, but she then showed me another solution, to put Zeiss linces in.
The reason was that the UV light, that the PHOTOCHROMIC system uses, is blocked by the windshield. I am flying at the moment in a Socata TB-9 Tampico and I do not know of what material the windshield is made of, but I presume plastic so the question is: how much UV light does a normal windshield block.
A normal pair of glasses block about 20%
Martin