With most of the new animation movies now only coming in 3D, it has become imperative for me to acquire a set of 3D glasses for my 4 year old son, the ones given at the theatre are too big for him and he gets irritated as a result...now there are stuff available in ebay and amazon, but just wondering what kind of 3d glasses to get which will work in the indian theatres? is there a specific technology or any passive glass will work? will the ones from RealD work here?