Bacteria is everywhere! This is just another anti 3D POS propaganda by idiots who fabricate FUD. What a bunch of losers!
Common bacterial infection of the eye is pink-eye. How many have experienced a case of pink-eye after watching a 3D movie wearing those public glasses? I think your dangers are statistically much greater getting mugged in the theater parking lot, getting food poisoning from bad food at the concession stand, getting pick pocketed from a thief sitting behind you, and choking on popcorn while laughing at a funny scene in the movie.