Russian researches discover reasons for 3D caused headaches

 "A team of scientists led by Dmitry Vatolin, senior research fellow at Lomonosov Moscow State University, investigated the problem of headache provoked by 3D-movies for more than eight years.

This headache is a brain's reaction to the "wrong" images coming to both eyes simultaneously. The brain needs to combine them to produce a stereo effect, but unfortunately it does not always succeed.

Vatolin's research team names more than 15 reasons for that problem. These can be separated into two categories: imperfections of equipment and errors in the movie."

- http://www.newkerala.com/

This is only a small part of a bigger article. You can read more about it here .  

It would seem most 3D discomfort is caused by issues that can easily be corrected . 

Source :  http://www.newkerala.com/