I forgot to mention that supposedly it works best farther back, and the glasses DO fit over your regular glasses (my husband wears glasses).
Both IMAX and regular 3d are done with light polarization, but they were giving out different glasses where we saw it. I don't know what the difference was - possibly the IMAX glasses are bigger? Anyway either kind fits over regular glasses. We sat way up front (only seats left) and it was great.