My girlfriend and I went to see "Brave" together at a movie theatre, but for her this was a painful experience. She recently got new prescription glasses and now she couldn't see the 3D-effect at all! The glasses simply didn't do a thing for her. With her old prescription glasses she watched 3D movies before without problems but something about the new ones somehow broke the polarisation?
The technique used for 3D in that theatre is circular polarisation of the light, and it's very interesting how that works. I simply cannot work out how her glasses, used under the 3D glasses, could break this. To me it seems like her glasses come after the whole polarisation-depolarisation process.
Has anyone else had similar problems or could explain this phenomenon? Maybe even have a solution?
Thanks a lot!