Are you one of the estimated 30+% people who don't perceive 3-D, stuggle with it, or even get sick? Amanda Gardner, a HealthDay Reporter, recently wrote an article that highlights some of these differences. Turns out it has to do with vision and with perception, both of which have to do with your brain. She quotes Dr. James J. Salz, spokesman for the American Academy of Ophthalmology and clinical professor of ophthalmology at the University of Southern California in Los Angeles, as explaining: "In 3-D movies, your eyes have to be working together as a team perfectly. You have to have equally clear images in both eyes.; Then you will get the fusion of the two images." In addition, you need a good fusional mechanism. Turns out not everyone does. It might be helpful to figure this out before you purchase a 3-D television!