Some peoble having problems viewing 3D-cinema due to refractive errors in their eyes. Some social problems may arise because your friends want to watch a movie at 3d-cinema and you can’t.
But now you can! Introducing Mono Glasses.
Original 3D-glasses for cinema-usage.
It’s uses polarized filters to separate the left image from the right. By replacing the right filter with a left one you will have a pair of glasses that only could see the left image.
This requires you to have 2 spare 3D-glasses to remake into 2 new mono glasses.