Three-dimensional technology allows a movie to be a real spectacle in front of the eye. But despite the success of spoil the imagination, the films with the technology of three dimensional (3D), which is usually combined with computer animation these cause health side effects for the audience.

Not a few audiences complained 3D movie cause headaches, nausea, blurred vision and other symptoms that is caused by the image on the cinema screen. According to experts, the culprit is the images in the film caused the eye movements are not natural.

Normally, when someone approached the object, the eye will respond in two ways. The eyes would concentrate the views or rotate inward to follow it (eg when the eyes followed the finger brought near the nose). At the same time, when the object is approached, the eye will try to focus and keep the picture remains clear by changing the shape of the lens. The process is called visual accommodation.

But when we presented the pictures that seemed out of the screen, there was sensory disturbance. Then it will turn inward to follow but at the same time they also have to maintain focus on objects that are displayed. The result is a centralization of view without lens accommodation.

When this happens for some time, for example watch a movie that is long enough, can cause the eyes become tired and cause tension. To prevent this, avoid seeing images that do not focus on the screen.