verb, -fied, fy-ing
when your eyes are forced to focus on one object after another, so your brain tries to keep up, which it cannot, so it results in your eyes trying to focus on two distances at once.
Meh, 3D. I don't like 3D...because my eyes were designed for real life. My brain tells my eyes what to focus on, and they comply. Consistent smooth transition from focusing on one object and then another. 3D movies however, attempt to force your eyes to focus on one object after another... Some people are unaffected by this process, but I find it primarily distracting and a bit dizzifying.